| Message ID | 20240819090428.17349-2-eichest@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: imx6: reset link after suspend/resume | expand |
On Mon, Aug 19, 2024 at 11:03:17AM +0200, Stefan Eichenberger wrote: > From: Stefan Eichenberger <stefan.eichenberger@toradex.com> > > To avoid code duplication, move the code to disable the reset GPIO to a > separate function. Add help function imx6_pcie_deassert_reset_gpio() to handle reset GPIO. > > Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com> > --- > drivers/pci/controller/dwc/pci-imx6.c | 19 ++++++++++++------- > 1 file changed, 12 insertions(+), 7 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c > index 964d67756eb2b..fda704d82431f 100644 > --- a/drivers/pci/controller/dwc/pci-imx6.c > +++ b/drivers/pci/controller/dwc/pci-imx6.c > @@ -722,6 +722,17 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) > gpiod_set_value_cansleep(imx6_pcie->reset_gpiod, 1); > } > > +static void imx6_pcie_deassert_reset_gpio(struct imx6_pcie *imx6_pcie) > +{ > + /* Some boards don't have PCIe reset GPIO. */ > + if (imx6_pcie->reset_gpiod) { > + msleep(100); > + gpiod_set_value_cansleep(imx6_pcie->reset_gpiod, 0); > + /* Wait for 100ms after PERST# deassertion (PCIe r5.0, 6.6.1) */ > + msleep(100); > + } > +} > + > static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) > { > struct dw_pcie *pci = imx6_pcie->pci; > @@ -766,13 +777,7 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) > break; > } > > - /* Some boards don't have PCIe reset GPIO. */ > - if (imx6_pcie->reset_gpiod) { > - msleep(100); > - gpiod_set_value_cansleep(imx6_pcie->reset_gpiod, 0); > - /* Wait for 100ms after PERST# deassertion (PCIe r5.0, 6.6.1) */ > - msleep(100); > - } > + imx6_pcie_deassert_reset_gpio(imx6_pcie); > > return 0; > } > -- > 2.43.0 >
On Mon, Aug 19, 2024 at 10:49:14AM -0400, Frank Li wrote: > On Mon, Aug 19, 2024 at 11:03:17AM +0200, Stefan Eichenberger wrote: > > From: Stefan Eichenberger <stefan.eichenberger@toradex.com> > > > > To avoid code duplication, move the code to disable the reset GPIO to a > > separate function. > > Add help function imx6_pcie_deassert_reset_gpio() to handle reset GPIO. > Sounds good, thanks for the suggestion.
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 964d67756eb2b..fda704d82431f 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -722,6 +722,17 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) gpiod_set_value_cansleep(imx6_pcie->reset_gpiod, 1); } +static void imx6_pcie_deassert_reset_gpio(struct imx6_pcie *imx6_pcie) +{ + /* Some boards don't have PCIe reset GPIO. */ + if (imx6_pcie->reset_gpiod) { + msleep(100); + gpiod_set_value_cansleep(imx6_pcie->reset_gpiod, 0); + /* Wait for 100ms after PERST# deassertion (PCIe r5.0, 6.6.1) */ + msleep(100); + } +} + static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) { struct dw_pcie *pci = imx6_pcie->pci; @@ -766,13 +777,7 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) break; } - /* Some boards don't have PCIe reset GPIO. */ - if (imx6_pcie->reset_gpiod) { - msleep(100); - gpiod_set_value_cansleep(imx6_pcie->reset_gpiod, 0); - /* Wait for 100ms after PERST# deassertion (PCIe r5.0, 6.6.1) */ - msleep(100); - } + imx6_pcie_deassert_reset_gpio(imx6_pcie); return 0; }