| Message ID | 20200901124955.137-1-ansuelsmth@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: qcom: Make sure PCIe is reset before init for rev 2.1.0 | expand |
On Tue 01 Sep 07:49 CDT 2020, Ansuel Smith wrote: > Qsdk U-Boot can incorrectly leave the PCIe interface in an undefined > state if bootm command is used instead of bootipq. This is caused by the > not deinit of PCIe when bootm is called. Reset the PCIe before init > anyway to fix this U-Boot bug. > Looks sensible. Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Regards, Bjorn > Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> > Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver") > Cc: stable@vger.kernel.org # v4.19+ > --- > drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c > index 3aac77a295ba..82336bbaf8dc 100644 > --- a/drivers/pci/controller/dwc/pcie-qcom.c > +++ b/drivers/pci/controller/dwc/pcie-qcom.c > @@ -302,6 +302,9 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie) > reset_control_assert(res->por_reset); > reset_control_assert(res->ext_reset); > reset_control_assert(res->phy_reset); > + > + writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL); > + > regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies); > } > > @@ -314,6 +317,16 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie) > u32 val; > int ret; > > + /* reset the PCIe interface as uboot can leave it undefined state */ > + reset_control_assert(res->pci_reset); > + reset_control_assert(res->axi_reset); > + reset_control_assert(res->ahb_reset); > + reset_control_assert(res->por_reset); > + reset_control_assert(res->ext_reset); > + reset_control_assert(res->phy_reset); > + > + writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL); > + > ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies); > if (ret < 0) { > dev_err(dev, "cannot enable regulators\n"); > -- > 2.27.0 >
On Tue, Sep 01, 2020 at 02:49:54PM +0200, Ansuel Smith wrote: > Qsdk U-Boot can incorrectly leave the PCIe interface in an undefined > state if bootm command is used instead of bootipq. This is caused by the > not deinit of PCIe when bootm is called. Reset the PCIe before init > anyway to fix this U-Boot bug. > > Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> > Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver") > Cc: stable@vger.kernel.org # v4.19+ > --- > drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) Applied to pci/qcom, thanks. Lorenzo > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c > index 3aac77a295ba..82336bbaf8dc 100644 > --- a/drivers/pci/controller/dwc/pcie-qcom.c > +++ b/drivers/pci/controller/dwc/pcie-qcom.c > @@ -302,6 +302,9 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie) > reset_control_assert(res->por_reset); > reset_control_assert(res->ext_reset); > reset_control_assert(res->phy_reset); > + > + writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL); > + > regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies); > } > > @@ -314,6 +317,16 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie) > u32 val; > int ret; > > + /* reset the PCIe interface as uboot can leave it undefined state */ > + reset_control_assert(res->pci_reset); > + reset_control_assert(res->axi_reset); > + reset_control_assert(res->ahb_reset); > + reset_control_assert(res->por_reset); > + reset_control_assert(res->ext_reset); > + reset_control_assert(res->phy_reset); > + > + writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL); > + > ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies); > if (ret < 0) { > dev_err(dev, "cannot enable regulators\n"); > -- > 2.27.0 >
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 3aac77a295ba..82336bbaf8dc 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -302,6 +302,9 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie) reset_control_assert(res->por_reset); reset_control_assert(res->ext_reset); reset_control_assert(res->phy_reset); + + writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL); + regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies); } @@ -314,6 +317,16 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie) u32 val; int ret; + /* reset the PCIe interface as uboot can leave it undefined state */ + reset_control_assert(res->pci_reset); + reset_control_assert(res->axi_reset); + reset_control_assert(res->ahb_reset); + reset_control_assert(res->por_reset); + reset_control_assert(res->ext_reset); + reset_control_assert(res->phy_reset); + + writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL); + ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies); if (ret < 0) { dev_err(dev, "cannot enable regulators\n");
Qsdk U-Boot can incorrectly leave the PCIe interface in an undefined state if bootm command is used instead of bootipq. This is caused by the not deinit of PCIe when bootm is called. Reset the PCIe before init anyway to fix this U-Boot bug. Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver") Cc: stable@vger.kernel.org # v4.19+ --- drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)