mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

phy: qcom-qmp-pcie: Fix high latency with 4x2 PHY when ASPM is enabled 

The PCIe QMP 4x2 RC PHY generates high latency when ASPM is enabled. This
seem to be fixed by clearing the QPHY_V5_20_PCS_PCIE_PRESET_P10_POST
register of the pcs_misc register space.

Fixes: 2c91bf6bf2 ("phy: qcom-qmp: Add SM8450 PCIe1 PHY support")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20221102081835.41892-1-manivannan.sadhasivam@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Manivannan Sadhasivam 2022-11-02 13:48:34 +05:30 committed by Vinod Koul
parent 2584068a9e
commit 9ddcd920f8
2 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
View File

@ -1430,6 +1430,7 @@ static const struct qmp_phy_init_tbl sm8450_qmp_gen4x2_pcie_pcs_misc_tbl[] = {
static const struct qmp_phy_init_tbl sm8450_qmp_gen4x2_pcie_rc_pcs_misc_tbl[] = {
QMP_PHY_INIT_CFG(QPHY_V5_20_PCS_PCIE_ENDPOINT_REFCLK_DRIVE, 0xc1),
QMP_PHY_INIT_CFG(QPHY_V5_20_PCS_PCIE_OSC_DTCT_ACTIONS, 0x00),
QMP_PHY_INIT_CFG(QPHY_V5_20_PCS_PCIE_PRESET_P10_POST, 0x00),
};
static const struct qmp_phy_init_tbl sm8450_qmp_gen4x2_pcie_ep_serdes_tbl[] = {

1
drivers/phy/qualcomm/phy-qcom-qmp-pcs-pcie-v5_20.h
View File

@ -11,6 +11,7 @@
#define QPHY_V5_20_PCS_PCIE_OSC_DTCT_MODE2_CONFIG5 0x084
#define QPHY_V5_20_PCS_PCIE_OSC_DTCT_ACTIONS 0x090
#define QPHY_V5_20_PCS_PCIE_EQ_CONFIG1 0x0a0
#define QPHY_V5_20_PCS_PCIE_PRESET_P10_POST 0x0e0
#define QPHY_V5_20_PCS_PCIE_G4_EQ_CONFIG5 0x108
#define QPHY_V5_20_PCS_PCIE_G4_PRE_GAIN 0x15c
#define QPHY_V5_20_PCS_PCIE_RX_MARGINING_CONFIG3 0x184