| Message ID | 20220423152403.1681222-3-pgwipeout@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Enable rk356x PCIe controller | expand |
Hi Peter, On Sa, 2022-04-23 at 11:24 -0400, Peter Geis wrote: > The PCIe controller is in an unknown state at driver probe. This can > lead to undesireable effects when the driver attempts to configure the > controller. > > Prevent issues in the future by resetting the core during probe. > > Signed-off-by: Peter Geis <pgwipeout@gmail.com> > --- > drivers/pci/controller/dwc/pcie-dw-rockchip.c | 22 +++++++------------ > 1 file changed, 8 insertions(+), 14 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c > index c9b341e55cbb..d67ed811e752 100644 > --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c > +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c > @@ -152,7 +152,13 @@ static int rockchip_pcie_resource_get(struct platform_device *pdev, > if (IS_ERR(rockchip->rst_gpio)) > return PTR_ERR(rockchip->rst_gpio); > > - return 0; > + rockchip->rst = devm_reset_control_array_get_exclusive(&pdev->dev); > + if (IS_ERR(rockchip->rst)) > + return dev_err_probe(&pdev->dev, PTR_ERR(rockchip->rst), > + "failed to get reset lines\n"); > + > + return reset_control_assert(rockchip->rst); This makes "rockchip_pcie_resource_get" a bit of a misnomer, maybe move this out into rockchip_pcie_probe()? > + Superfluous whitespace. regards Philipp
On Mon, Apr 25, 2022 at 5:20 AM Philipp Zabel <p.zabel@pengutronix.de> wrote: > > Hi Peter, > > On Sa, 2022-04-23 at 11:24 -0400, Peter Geis wrote: > > The PCIe controller is in an unknown state at driver probe. This can > > lead to undesireable effects when the driver attempts to configure the > > controller. > > > > Prevent issues in the future by resetting the core during probe. > > > > Signed-off-by: Peter Geis <pgwipeout@gmail.com> > > --- > > drivers/pci/controller/dwc/pcie-dw-rockchip.c | 22 +++++++------------ > > 1 file changed, 8 insertions(+), 14 deletions(-) > > > > diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c > > index c9b341e55cbb..d67ed811e752 100644 > > --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c > > +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c > > @@ -152,7 +152,13 @@ static int rockchip_pcie_resource_get(struct platform_device *pdev, > > if (IS_ERR(rockchip->rst_gpio)) > > return PTR_ERR(rockchip->rst_gpio); > > > > - return 0; > > + rockchip->rst = devm_reset_control_array_get_exclusive(&pdev->dev); > > + if (IS_ERR(rockchip->rst)) > > + return dev_err_probe(&pdev->dev, PTR_ERR(rockchip->rst), > > + "failed to get reset lines\n"); > > + > > + return reset_control_assert(rockchip->rst); > > This makes "rockchip_pcie_resource_get" a bit of a misnomer, maybe move > this out into rockchip_pcie_probe()? Ah, yes that does make sense, thanks. > > > + > > Superfluous whitespace. > > regards > Philipp >
diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c index c9b341e55cbb..d67ed811e752 100644 --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c @@ -152,7 +152,13 @@ static int rockchip_pcie_resource_get(struct platform_device *pdev, if (IS_ERR(rockchip->rst_gpio)) return PTR_ERR(rockchip->rst_gpio); - return 0; + rockchip->rst = devm_reset_control_array_get_exclusive(&pdev->dev); + if (IS_ERR(rockchip->rst)) + return dev_err_probe(&pdev->dev, PTR_ERR(rockchip->rst), + "failed to get reset lines\n"); + + return reset_control_assert(rockchip->rst); + } static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip) @@ -182,18 +188,6 @@ static void rockchip_pcie_phy_deinit(struct rockchip_pcie *rockchip) phy_power_off(rockchip->phy); } -static int rockchip_pcie_reset_control_release(struct rockchip_pcie *rockchip) -{ - struct device *dev = rockchip->pci.dev; - - rockchip->rst = devm_reset_control_array_get_exclusive(dev); - if (IS_ERR(rockchip->rst)) - return dev_err_probe(dev, PTR_ERR(rockchip->rst), - "failed to get reset lines\n"); - - return reset_control_deassert(rockchip->rst); -} - static const struct dw_pcie_ops dw_pcie_ops = { .link_up = rockchip_pcie_link_up, .start_link = rockchip_pcie_start_link, @@ -241,7 +235,7 @@ static int rockchip_pcie_probe(struct platform_device *pdev) if (ret) goto disable_regulator; - ret = rockchip_pcie_reset_control_release(rockchip); + ret = reset_control_deassert(rockchip->rst); if (ret) goto deinit_phy;
The PCIe controller is in an unknown state at driver probe. This can lead to undesireable effects when the driver attempts to configure the controller. Prevent issues in the future by resetting the core during probe. Signed-off-by: Peter Geis <pgwipeout@gmail.com> --- drivers/pci/controller/dwc/pcie-dw-rockchip.c | 22 +++++++------------ 1 file changed, 8 insertions(+), 14 deletions(-)