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imx6: kernel: fix occasional link failure

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Signed-off-by: Tim Harvey <tharvey@gateworks.com>

SVN-Revision: 42145
This commit is contained in:
Luka Perkov 2014-08-11 20:35:04 +00:00
parent fe5d39d66c
commit e47c4d7014
1 changed files with 38 additions and 0 deletions
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38
target/linux/imx6/patches-3.14/0060-pci_imx6_fix-link-failure.patch Normal file
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@ -0,0 +1,38 @@
PCI: imx6: fix occasional link failure
According to the IMX6 reference manuals, REF_SSP_EN (Reference clock enable
for SS function) must remain deasserted until the reference clock is running
at the appropriate frequency.
Without this patch we find a high link failure rate (>5%) on certain
IMX6 boards at various temperatures.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -262,11 +262,6 @@ static int imx6_pcie_deassert_core_reset
if (gpio_is_valid(imx6_pcie->power_on_gpio))
gpio_set_value(imx6_pcie->power_on_gpio, 1);
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
- IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
- IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
-
ret = clk_prepare_enable(imx6_pcie->sata_ref_100m);
if (ret) {
dev_err(pp->dev, "unable to enable sata_ref_100m\n");
@@ -294,6 +289,12 @@ static int imx6_pcie_deassert_core_reset
/* allow the clocks to stabilize */
usleep_range(200, 500);
+ /* power up core phy and enable ref clock */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+ IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+ IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+
/* Some boards don't have PCIe reset GPIO. */
if (gpio_is_valid(imx6_pcie->reset_gpio)) {
gpio_set_value(imx6_pcie->reset_gpio, 0);