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authorTim Harvey <tharvey@gateworks.com>2014-08-07 22:57:29 -0700
committerStefano Babic <sbabic@denx.de>2014-08-20 12:37:15 +0200
commit5a82e1a21d1229e7e3d1c64187735794019e9a1b (patch)
tree375fe3d824eb4c617917df43ec035ba93b4d3d8d /drivers/pci/pcie_imx.c
parent0351ef97d7f8aef0ae03f80c43f2d6d7b97174e7 (diff)
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pci: mx6: fix occasional link failures
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> Acked-by: Marek Vasut <marex@denx.de> Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>
Diffstat (limited to 'drivers/pci/pcie_imx.c')
-rw-r--r--drivers/pci/pcie_imx.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/pci/pcie_imx.c b/drivers/pci/pcie_imx.c
index c48737e..a3982c4 100644
--- a/drivers/pci/pcie_imx.c
+++ b/drivers/pci/pcie_imx.c
@@ -509,10 +509,6 @@ static int imx6_pcie_deassert_core_reset(void)
imx6_pcie_toggle_power();
- /* Enable PCIe */
- clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN);
- setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_REF_SSP_EN);
-
enable_pcie_clock();
/*
@@ -521,6 +517,10 @@ static int imx6_pcie_deassert_core_reset(void)
*/
mdelay(50);
+ /* Enable PCIe */
+ clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN);
+ setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_REF_SSP_EN);
+
imx6_pcie_toggle_reset();
return 0;