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 --- drivers/pci/pcie_imx.c | 8 ++++---- 1 file 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;