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Commit 95ace943 authored by Yan He's avatar Yan He
Browse files

msm: pcie: Assert PERST after link training failure 



The PCIe endpoint may start link training if PERST is de-asserted,
and may fall into failure if Root Complex (RC) side is not ready
yet. Thus, RC side needs to assert PERST whenever link training
fails.

Change-Id: I973d2cbca7d6597b0e5ccfbcdf71c477f7aba461
Signed-off-by: default avatarYan He <yanhe@codeaurora.org>
parent 77f27f1d

arch/arm/mach-msm/pcie.c

+3 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.

/* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -985,6 +985,8 @@ static int msm_pcie_enable(struct msm_pcie_dev_t *dev, u32 options) 
	if (val & XMLH_LINK_UP) {

		pr_info("PCIe link initialized\n");

	} else {

		gpio_set_value(dev->gpio[MSM_PCIE_GPIO_PERST].num,

			dev->gpio[MSM_PCIE_GPIO_PERST].on);

		pr_err("PCIe link initialization failed\n");

		ret = -1;

		goto link_fail;