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Message-ID: <20240107053548.GK3416@thinkpad>
Date: Sun, 7 Jan 2024 11:05:48 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Frank Li <Frank.li@....com>
Cc: krzysztof.kozlowski@...aro.org, bhelgaas@...gle.com,
conor+dt@...nel.org, devicetree@...r.kernel.org, festevam@...il.com,
helgaas@...nel.org, hongxing.zhu@....com, imx@...ts.linux.dev,
kernel@...gutronix.de, krzysztof.kozlowski+dt@...aro.org,
kw@...ux.com, l.stach@...gutronix.de,
linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
lpieralisi@...nel.org, robh@...nel.org, s.hauer@...gutronix.de,
shawnguo@...nel.org
Subject: Re: [PATCH v7 07/16] PCI: imx6: Simplify configure_type() by using
mode_off and mode_mask
On Sun, Jan 07, 2024 at 12:32:14AM -0500, Frank Li wrote:
> On Sun, Jan 07, 2024 at 10:46:55AM +0530, Manivannan Sadhasivam wrote:
> > On Wed, Dec 27, 2023 at 01:27:18PM -0500, Frank Li wrote:
> > > Add drvdata::mode_off and drvdata::mode_mask to simple
> >
> > simplify
> >
> > > imx6_pcie_configure_type() logic.
> > >
> > > Signed-off-by: Frank Li <Frank.Li@....com>
> >
> > Couple of comments below.
> >
> > > ---
> > >
> > > Notes:
> > > Change from v2 to v3
> > > - none
> > > Change from v1 to v2
> > > - use ffs() to fixe build error.
> > >
> > > drivers/pci/controller/dwc/pci-imx6.c | 60 ++++++++++++++++++---------
> > > 1 file changed, 40 insertions(+), 20 deletions(-)
> > >
> > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> > > index 588bfb616260e..717e8fa030deb 100644
> > > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > > @@ -68,6 +68,7 @@ enum imx6_pcie_variants {
> > >
> > > #define IMX6_PCIE_MAX_CLKS 6
> > >
> > > +#define IMX6_PCIE_MAX_INSTANCES 2
> > > struct imx6_pcie_drvdata {
> > > enum imx6_pcie_variants variant;
> > > enum dw_pcie_device_mode mode;
> > > @@ -77,6 +78,8 @@ struct imx6_pcie_drvdata {
> > > const char *clk_names[IMX6_PCIE_MAX_CLKS];
> > > const u32 ltssm_off;
> > > const u32 ltssm_mask;
> > > + const u32 mode_off[IMX6_PCIE_MAX_INSTANCES];
> > > + const u32 mode_mask[IMX6_PCIE_MAX_INSTANCES];
> > > };
> > >
> > > struct imx6_pcie {
> > > @@ -174,32 +177,25 @@ static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie)
> > >
> > > static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie)
> > > {
> > > - unsigned int mask, val, mode;
> > > + const struct imx6_pcie_drvdata *drvdata = imx6_pcie->drvdata;
> > > + unsigned int mask, val, mode, id;
> > >
> > > - if (imx6_pcie->drvdata->mode == DW_PCIE_EP_TYPE)
> > > + if (drvdata->mode == DW_PCIE_EP_TYPE)
> > > mode = PCI_EXP_TYPE_ENDPOINT;
> > > else
> > > mode = PCI_EXP_TYPE_ROOT_PORT;
> > >
> > > - switch (imx6_pcie->drvdata->variant) {
> > > - case IMX8MQ:
> > > - case IMX8MQ_EP:
> > > - if (imx6_pcie->controller_id == 1) {
> > > - mask = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE;
> > > - val = FIELD_PREP(IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
> > > - mode);
> > > - } else {
> > > - mask = IMX6Q_GPR12_DEVICE_TYPE;
> > > - val = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE, mode);
> > > - }
> > > - break;
> > > - default:
> > > - mask = IMX6Q_GPR12_DEVICE_TYPE;
> > > - val = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE, mode);
> > > - break;
> > > - }
> > > + id = imx6_pcie->controller_id;
> > > +
> > > + /* If mode_mask[id] is zero, means each controller have its individual gpr */
> > > + if (!drvdata->mode_mask[id])
> > > + id = 0;
> > > +
> > > + mask = drvdata->mode_mask[id];
> > > + /* FIELD_PREP mask have been constant */
> >
> > No need of this comment.
> >
> > > + val = mode << (ffs(mask) - 1);
> > >
> > > - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, mask, val);
> > > + regmap_update_bits(imx6_pcie->iomuxc_gpr, drvdata->mode_off[id], mask, val);
> > > }
> > >
> > > static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, bool exp_val)
> > > @@ -1376,6 +1372,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > > .clk_names = {"pcie_bus", "pcie", "pcie_phy"},
> > > .ltssm_off = IOMUXC_GPR12,
> > > .ltssm_mask = IMX6Q_GPR12_PCIE_CTL_2,
> > > + .mode_off[0] = IOMUXC_GPR12,
> > > + .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> > > },
> > > [IMX6SX] = {
> > > .variant = IMX6SX,
> > > @@ -1386,6 +1384,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > > .clk_names = {"pcie_bus", "pcie", "pcie_phy", "pcie_inbound_axi"},
> > > .ltssm_off = IOMUXC_GPR12,
> > > .ltssm_mask = IMX6Q_GPR12_PCIE_CTL_2,
> > > + .mode_off[0] = IOMUXC_GPR12,
> > > + .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> > > },
> > > [IMX6QP] = {
> > > .variant = IMX6QP,
> > > @@ -1397,6 +1397,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > > .clk_names = {"pcie_bus", "pcie", "pcie_phy"},
> > > .ltssm_off = IOMUXC_GPR12,
> > > .ltssm_mask = IMX6Q_GPR12_PCIE_CTL_2,
> > > + .mode_off[0] = IOMUXC_GPR12,
> > > + .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> > > },
> > > [IMX7D] = {
> > > .variant = IMX7D,
> > > @@ -1405,6 +1407,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > > IMX6_PCIE_FLAG_HAS_PHY_RESET,
> > > .gpr = "fsl,imx7d-iomuxc-gpr",
> > > .clk_names = {"pcie_bus", "pcie", "pcie_phy"},
> > > + .mode_off[0] = IOMUXC_GPR12,
> > > + .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> > > },
> > > [IMX8MQ] = {
> > > .variant = IMX8MQ,
> > > @@ -1412,6 +1416,10 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > > IMX6_PCIE_FLAG_HAS_PHY_RESET,
> > > .gpr = "fsl,imx8mq-iomuxc-gpr",
> > > .clk_names = {"pcie_bus", "pcie", "pcie_phy", "pcie_aux"},
> > > + .mode_off[0] = IOMUXC_GPR12,
> > > + .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> > > + .mode_off[1] = IOMUXC_GPR12,
> > > + .mode_mask[1] = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
> >
> > Is the mode_mask differ between SoCs or fixed based on instances? I mean, if
> > there is a guarantee that it is going to be IMX6Q_GPR12_DEVICE_TYPE for instance
> > 1 and IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE for instance 2 etc...
> >
> > Then we can avoid these SoC specific config and simplify the code further.
>
> No, iMX95 will change it.
>
Ok, fine then.
- Mani
> Frank
>
> >
> > - Mani
> >
> > > },
> > > [IMX8MM] = {
> > > .variant = IMX8MM,
> > > @@ -1420,6 +1428,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > > IMX6_PCIE_FLAG_HAS_APP_RESET,
> > > .gpr = "fsl,imx8mm-iomuxc-gpr",
> > > .clk_names = {"pcie_bus", "pcie", "pcie_aux"},
> > > + .mode_off[0] = IOMUXC_GPR12,
> > > + .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> > > },
> > > [IMX8MP] = {
> > > .variant = IMX8MP,
> > > @@ -1428,6 +1438,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > > IMX6_PCIE_FLAG_HAS_APP_RESET,
> > > .gpr = "fsl,imx8mp-iomuxc-gpr",
> > > .clk_names = {"pcie_bus", "pcie", "pcie_aux"},
> > > + .mode_off[0] = IOMUXC_GPR12,
> > > + .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> > > },
> > > [IMX8MQ_EP] = {
> > > .variant = IMX8MQ_EP,
> > > @@ -1436,6 +1448,10 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > > .mode = DW_PCIE_EP_TYPE,
> > > .gpr = "fsl,imx8mq-iomuxc-gpr",
> > > .clk_names = {"pcie_bus", "pcie", "pcie_phy", "pcie_aux"},
> > > + .mode_off[0] = IOMUXC_GPR12,
> > > + .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> > > + .mode_off[1] = IOMUXC_GPR12,
> > > + .mode_mask[1] = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
> > > },
> > > [IMX8MM_EP] = {
> > > .variant = IMX8MM_EP,
> > > @@ -1443,6 +1459,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > > .mode = DW_PCIE_EP_TYPE,
> > > .gpr = "fsl,imx8mm-iomuxc-gpr",
> > > .clk_names = {"pcie_bus", "pcie", "pcie_aux"},
> > > + .mode_off[0] = IOMUXC_GPR12,
> > > + .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> > > },
> > > [IMX8MP_EP] = {
> > > .variant = IMX8MP_EP,
> > > @@ -1450,6 +1468,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > > .mode = DW_PCIE_EP_TYPE,
> > > .gpr = "fsl,imx8mp-iomuxc-gpr",
> > > .clk_names = {"pcie_bus", "pcie", "pcie_aux"},
> > > + .mode_off[0] = IOMUXC_GPR12,
> > > + .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> > > },
> > > };
> > >
> > > --
> > > 2.34.1
> > >
> >
> > --
> > மணிவண்ணன் சதாசிவம்
--
மணிவண்ணன் சதாசிவம்
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