Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Thunderbolt/USB4 retimer support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2020, Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Authors: Kranthi Kuntala <kranthi.kuntala@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *	    Mika Westerberg <mika.westerberg@linux.intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/pm_runtime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "sb_regs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "tb.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #define TB_MAX_RETIMER_INDEX	6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) static int tb_retimer_nvm_read(void *priv, unsigned int offset, void *val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 			       size_t bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	struct tb_nvm *nvm = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	struct tb_retimer *rt = tb_to_retimer(nvm->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	pm_runtime_get_sync(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	if (!mutex_trylock(&rt->tb->lock)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 		ret = restart_syscall();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	ret = usb4_port_retimer_nvm_read(rt->port, rt->index, offset, val, bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	mutex_unlock(&rt->tb->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	pm_runtime_mark_last_busy(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	pm_runtime_put_autosuspend(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) static int tb_retimer_nvm_write(void *priv, unsigned int offset, void *val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 				size_t bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	struct tb_nvm *nvm = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct tb_retimer *rt = tb_to_retimer(nvm->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	if (!mutex_trylock(&rt->tb->lock))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		return restart_syscall();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	ret = tb_nvm_write_buf(nvm, offset, val, bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	mutex_unlock(&rt->tb->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static int tb_retimer_nvm_add(struct tb_retimer *rt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	struct tb_nvm *nvm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	u32 val, nvm_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	nvm = tb_nvm_alloc(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	if (IS_ERR(nvm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		return PTR_ERR(nvm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	ret = usb4_port_retimer_nvm_read(rt->port, rt->index, NVM_VERSION, &val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 					 sizeof(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		goto err_nvm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	nvm->major = val >> 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	nvm->minor = val >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	ret = usb4_port_retimer_nvm_read(rt->port, rt->index, NVM_FLASH_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 					 &val, sizeof(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		goto err_nvm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	nvm_size = (SZ_1M << (val & 7)) / 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	nvm_size = (nvm_size - SZ_16K) / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	ret = tb_nvm_add_active(nvm, nvm_size, tb_retimer_nvm_read);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		goto err_nvm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	ret = tb_nvm_add_non_active(nvm, NVM_MAX_SIZE, tb_retimer_nvm_write);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		goto err_nvm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	rt->nvm = nvm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) err_nvm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	tb_nvm_free(nvm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static int tb_retimer_nvm_validate_and_write(struct tb_retimer *rt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	unsigned int image_size, hdr_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	const u8 *buf = rt->nvm->buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	u16 ds_size, device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	image_size = rt->nvm->buf_data_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	 * FARB pointer must point inside the image and must at least
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	 * contain parts of the digital section we will be reading here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	hdr_size = (*(u32 *)buf) & 0xffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (hdr_size + NVM_DEVID + 2 >= image_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	/* Digital section start should be aligned to 4k page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	if (!IS_ALIGNED(hdr_size, SZ_4K))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	 * Read digital section size and check that it also fits inside
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	 * the image.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	ds_size = *(u16 *)(buf + hdr_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (ds_size >= image_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	 * Make sure the device ID in the image matches the retimer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	 * hardware.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	device = *(u16 *)(buf + hdr_size + NVM_DEVID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	if (device != rt->device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	/* Skip headers in the image */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	buf += hdr_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	image_size -= hdr_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	return usb4_port_retimer_nvm_write(rt->port, rt->index, 0, buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 					   image_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static ssize_t device_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			   char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	struct tb_retimer *rt = tb_to_retimer(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	return sprintf(buf, "%#x\n", rt->device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static DEVICE_ATTR_RO(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static ssize_t nvm_authenticate_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	struct tb_retimer *rt = tb_to_retimer(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (!mutex_trylock(&rt->tb->lock))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		return restart_syscall();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	if (!rt->nvm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		ret = sprintf(buf, "%#x\n", rt->auth_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	mutex_unlock(&rt->tb->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static ssize_t nvm_authenticate_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	struct device_attribute *attr, const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	struct tb_retimer *rt = tb_to_retimer(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	bool val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	pm_runtime_get_sync(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (!mutex_trylock(&rt->tb->lock)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		ret = restart_syscall();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		goto exit_rpm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (!rt->nvm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		goto exit_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	ret = kstrtobool(buf, &val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		goto exit_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	/* Always clear status */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	rt->auth_status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		if (!rt->nvm->buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			goto exit_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		ret = tb_retimer_nvm_validate_and_write(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			goto exit_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		ret = usb4_port_retimer_nvm_authenticate(rt->port, rt->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) exit_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	mutex_unlock(&rt->tb->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) exit_rpm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	pm_runtime_mark_last_busy(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	pm_runtime_put_autosuspend(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) static DEVICE_ATTR_RW(nvm_authenticate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) static ssize_t nvm_version_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 				struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	struct tb_retimer *rt = tb_to_retimer(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	if (!mutex_trylock(&rt->tb->lock))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		return restart_syscall();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (!rt->nvm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		ret = sprintf(buf, "%x.%x\n", rt->nvm->major, rt->nvm->minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	mutex_unlock(&rt->tb->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static DEVICE_ATTR_RO(nvm_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			   char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	struct tb_retimer *rt = tb_to_retimer(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	return sprintf(buf, "%#x\n", rt->vendor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) static DEVICE_ATTR_RO(vendor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static struct attribute *retimer_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	&dev_attr_device.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	&dev_attr_nvm_authenticate.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	&dev_attr_nvm_version.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	&dev_attr_vendor.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) static const struct attribute_group retimer_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	.attrs = retimer_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) static const struct attribute_group *retimer_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	&retimer_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static void tb_retimer_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	struct tb_retimer *rt = tb_to_retimer(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	kfree(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) struct device_type tb_retimer_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	.name = "thunderbolt_retimer",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	.groups = retimer_groups,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	.release = tb_retimer_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) static int tb_retimer_add(struct tb_port *port, u8 index, u32 auth_status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	struct tb_retimer *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	u32 vendor, device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	if (!port->cap_usb4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	ret = usb4_port_retimer_read(port, index, USB4_SB_VENDOR_ID, &vendor,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 				     sizeof(vendor));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		if (ret != -ENODEV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			tb_port_warn(port, "failed read retimer VendorId: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	ret = usb4_port_retimer_read(port, index, USB4_SB_PRODUCT_ID, &device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 				     sizeof(device));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		if (ret != -ENODEV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 			tb_port_warn(port, "failed read retimer ProductId: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	if (vendor != PCI_VENDOR_ID_INTEL && vendor != 0x8087) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		tb_port_info(port, "retimer NVM format of vendor %#x is not supported\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 			     vendor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	 * Check that it supports NVM operations. If not then don't add
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	 * the device at all.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	ret = usb4_port_retimer_nvm_sector_size(port, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	rt = kzalloc(sizeof(*rt), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	if (!rt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	rt->index = index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	rt->vendor = vendor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	rt->device = device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	rt->auth_status = auth_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	rt->port = port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	rt->tb = port->sw->tb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	rt->dev.parent = &port->sw->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	rt->dev.bus = &tb_bus_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	rt->dev.type = &tb_retimer_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	dev_set_name(&rt->dev, "%s:%u.%u", dev_name(&port->sw->dev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		     port->port, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	ret = device_register(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		dev_err(&rt->dev, "failed to register retimer: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		put_device(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	ret = tb_retimer_nvm_add(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		dev_err(&rt->dev, "failed to add NVM devices: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		device_unregister(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	dev_info(&rt->dev, "new retimer found, vendor=%#x device=%#x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		 rt->vendor, rt->device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	pm_runtime_no_callbacks(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	pm_runtime_set_active(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	pm_runtime_enable(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	pm_runtime_set_autosuspend_delay(&rt->dev, TB_AUTOSUSPEND_DELAY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	pm_runtime_mark_last_busy(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	pm_runtime_use_autosuspend(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) static void tb_retimer_remove(struct tb_retimer *rt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	dev_info(&rt->dev, "retimer disconnected\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	tb_nvm_free(rt->nvm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	device_unregister(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) struct tb_retimer_lookup {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	const struct tb_port *port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	u8 index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) static int retimer_match(struct device *dev, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	const struct tb_retimer_lookup *lookup = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	struct tb_retimer *rt = tb_to_retimer(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	return rt && rt->port == lookup->port && rt->index == lookup->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) static struct tb_retimer *tb_port_find_retimer(struct tb_port *port, u8 index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	struct tb_retimer_lookup lookup = { .port = port, .index = index };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	dev = device_find_child(&port->sw->dev, &lookup, retimer_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	if (dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		return tb_to_retimer(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)  * tb_retimer_scan() - Scan for on-board retimers under port
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)  * @port: USB4 port to scan
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)  * Tries to enumerate on-board retimers connected to @port. Found
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)  * retimers are registered as children of @port. Does not scan for cable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)  * retimers for now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) int tb_retimer_scan(struct tb_port *port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	u32 status[TB_MAX_RETIMER_INDEX + 1] = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	int ret, i, last_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	if (!port->cap_usb4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	 * Send broadcast RT to make sure retimer indices facing this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	 * port are set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	ret = usb4_port_enumerate_retimers(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	 * Before doing anything else, read the authentication status.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	 * If the retimer has it set, store it for the new retimer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	 * device instance.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 		usb4_port_retimer_nvm_authenticate_status(port, i, &status[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 		 * Last retimer is true only for the last on-board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 		 * retimer (the one connected directly to the Type-C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 		 * port).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 		ret = usb4_port_retimer_is_last(port, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 		if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 			last_idx = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 		else if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	if (!last_idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	/* Add on-board retimers if they do not exist already */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	for (i = 1; i <= last_idx; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 		struct tb_retimer *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 		rt = tb_port_find_retimer(port, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 		if (rt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 			put_device(&rt->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 			ret = tb_retimer_add(port, i, status[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 			if (ret && ret != -EOPNOTSUPP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 				return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) static int remove_retimer(struct device *dev, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 	struct tb_retimer *rt = tb_to_retimer(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 	struct tb_port *port = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	if (rt && rt->port == port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 		tb_retimer_remove(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)  * tb_retimer_remove_all() - Remove all retimers under port
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)  * @port: USB4 port whose retimers to remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)  * This removes all previously added retimers under @port.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) void tb_retimer_remove_all(struct tb_port *port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	if (port->cap_usb4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 		device_for_each_child_reverse(&port->sw->dev, port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 					      remove_retimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }