| Message ID | 20230622194021.80892-1-athierry@redhat.com |
|---|---|
| Headers | show |
| Series | Fixes for qcom-snps-femto-v2 PHY driver | expand |
On Thu, Jun 22, 2023 at 03:40:18PM -0400, Adrien Thierry wrote: > The driver is not enabling the ref clock, which thus gets disabled by > the clk_disable_unused initcall. This leads to the dwc3 controller > failing to initialize if probed after clk_disable_unused is called, for > instance when the driver is built as a module. > > To fix this, switch to the clk_bulk API to handle both cfg_ahb and ref > clocks at the proper places. > > Note that the cfg_ahb clock is currently not used by any device tree > instantiation of the PHY. Work needs to be done separately to fix this. > > Link: https://lore.kernel.org/linux-arm-msm/ZEqvy+khHeTkC2hf@fedora/ > Fixes: 51e8114f80d0 ("phy: qcom-snps: Add SNPS USB PHY driver for QCOM based SOCs") > Reviewed-by: Andrew Halaney <ahalaney@redhat.com> > Signed-off-by: Adrien Thierry <athierry@redhat.com> > --- > drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 67 ++++++++++++++----- > 1 file changed, 49 insertions(+), 18 deletions(-) > > diff --git a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c > index 6c237f3cc66d..ce1d2f8b568a 100644 > --- a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c > +++ b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c > @@ -110,11 +110,13 @@ struct phy_override_seq { > /** > * struct qcom_snps_hsphy - snps hs phy attributes > * > + * @dev: device structure > + * > * @phy: generic phy > * @base: iomapped memory space for snps hs phy > * > - * @cfg_ahb_clk: AHB2PHY interface clock > - * @ref_clk: phy reference clock > + * @num_clks: number of clocks > + * @clks: array of clocks > * @phy_reset: phy reset control > * @vregs: regulator supplies bulk data > * @phy_initialized: if PHY has been initialized correctly > @@ -122,11 +124,13 @@ struct phy_override_seq { > * @update_seq_cfg: tuning parameters for phy init > */ > struct qcom_snps_hsphy { > + struct device *dev; > + > struct phy *phy; > void __iomem *base; > > - struct clk *cfg_ahb_clk; > - struct clk *ref_clk; > + int num_clks; > + struct clk_bulk_data *clks; > struct reset_control *phy_reset; > struct regulator_bulk_data vregs[SNPS_HS_NUM_VREGS]; > > @@ -135,6 +139,32 @@ struct qcom_snps_hsphy { > struct phy_override_seq update_seq_cfg[NUM_HSPHY_TUNING_PARAMS]; > }; > > +static int qcom_snps_hsphy_clk_init(struct qcom_snps_hsphy *hsphy) > +{ > + struct device *dev = hsphy->dev; > + > + hsphy->num_clks = 2; > + hsphy->clks = devm_kcalloc(dev, hsphy->num_clks, sizeof(*hsphy->clks), GFP_KERNEL); This is ok, but it it wouldn't be wrong to just make clks[2] in the context struct... > + if (!hsphy->clks) > + return -ENOMEM; > + > + /* > + * HACK: For cfg_ahb clock, use devm_clk_get_optional() because currently no device Doesn't look to hacky to me, this is how you use the API if you need to do what you propose. So I would suggest dropping "HACK: For cfg_ahb clock, ". The remainder of the comment is good to keep (if anything it's a TODO, to drop this sometime in the future). > + * tree instantiation of the PHY is using the clock. This needs to be fixed in order > + * for this code to be able to use devm_clk_bulk_get(). > + */ > + hsphy->clks[0].id = "cfg_ahb"; > + hsphy->clks[0].clk = devm_clk_get_optional(dev, "cfg_ahb"); The clock is optional, but you still need to check for IS_ERR() in case it's specified and there's an issue acquiring it. > + > + hsphy->clks[1].id = "ref"; > + hsphy->clks[1].clk = devm_clk_get(dev, "ref"); > + if (IS_ERR(hsphy->clks[1].clk)) > + return dev_err_probe(dev, PTR_ERR(hsphy->clks[1].clk), > + "failed to get ref clk\n"); > + > + return 0; > +} > + > static inline void qcom_snps_hsphy_write_mask(void __iomem *base, u32 offset, > u32 mask, u32 val) > { > @@ -165,7 +195,7 @@ static int qcom_snps_hsphy_suspend(struct qcom_snps_hsphy *hsphy) > 0, USB2_AUTO_RESUME); > } > > - clk_disable_unprepare(hsphy->cfg_ahb_clk); > + clk_bulk_disable_unprepare(hsphy->num_clks, hsphy->clks); > return 0; > } > > @@ -175,9 +205,9 @@ static int qcom_snps_hsphy_resume(struct qcom_snps_hsphy *hsphy) > > dev_dbg(&hsphy->phy->dev, "Resume QCOM SNPS PHY, mode\n"); > > - ret = clk_prepare_enable(hsphy->cfg_ahb_clk); > + ret = clk_bulk_prepare_enable(hsphy->num_clks, hsphy->clks); > if (ret) { > - dev_err(&hsphy->phy->dev, "failed to enable cfg ahb clock\n"); > + dev_err(&hsphy->phy->dev, "failed to enable clocks\n"); You can omit this print completely, because clk_bulk_prepare() and friends will log an error line telling you which clock failed to prepare already. > return ret; > } > > @@ -374,16 +404,16 @@ static int qcom_snps_hsphy_init(struct phy *phy) > if (ret) > return ret; > > - ret = clk_prepare_enable(hsphy->cfg_ahb_clk); > + ret = clk_bulk_prepare_enable(hsphy->num_clks, hsphy->clks); > if (ret) { > - dev_err(&phy->dev, "failed to enable cfg ahb clock, %d\n", ret); > + dev_err(&phy->dev, "failed to enable clocks, %d\n", ret); Here as well. Regards, Bjorn > goto poweroff_phy; > } > > ret = reset_control_assert(hsphy->phy_reset); > if (ret) { > dev_err(&phy->dev, "failed to assert phy_reset, %d\n", ret); > - goto disable_ahb_clk; > + goto disable_clks; > } > > usleep_range(100, 150); > @@ -391,7 +421,7 @@ static int qcom_snps_hsphy_init(struct phy *phy) > ret = reset_control_deassert(hsphy->phy_reset); > if (ret) { > dev_err(&phy->dev, "failed to de-assert phy_reset, %d\n", ret); > - goto disable_ahb_clk; > + goto disable_clks; > } > > qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_CFG0, > @@ -448,8 +478,8 @@ static int qcom_snps_hsphy_init(struct phy *phy) > > return 0; > > -disable_ahb_clk: > - clk_disable_unprepare(hsphy->cfg_ahb_clk); > +disable_clks: > + clk_bulk_disable_unprepare(hsphy->num_clks, hsphy->clks); > poweroff_phy: > regulator_bulk_disable(ARRAY_SIZE(hsphy->vregs), hsphy->vregs); > > @@ -461,7 +491,7 @@ static int qcom_snps_hsphy_exit(struct phy *phy) > struct qcom_snps_hsphy *hsphy = phy_get_drvdata(phy); > > reset_control_assert(hsphy->phy_reset); > - clk_disable_unprepare(hsphy->cfg_ahb_clk); > + clk_bulk_disable_unprepare(hsphy->num_clks, hsphy->clks); > regulator_bulk_disable(ARRAY_SIZE(hsphy->vregs), hsphy->vregs); > hsphy->phy_initialized = false; > > @@ -554,14 +584,15 @@ static int qcom_snps_hsphy_probe(struct platform_device *pdev) > if (!hsphy) > return -ENOMEM; > > + hsphy->dev = dev; > + > hsphy->base = devm_platform_ioremap_resource(pdev, 0); > if (IS_ERR(hsphy->base)) > return PTR_ERR(hsphy->base); > > - hsphy->ref_clk = devm_clk_get(dev, "ref"); > - if (IS_ERR(hsphy->ref_clk)) > - return dev_err_probe(dev, PTR_ERR(hsphy->ref_clk), > - "failed to get ref clk\n"); > + ret = qcom_snps_hsphy_clk_init(hsphy); > + if (ret) > + return dev_err_probe(dev, ret, "failed to initialize clocks\n"); > > hsphy->phy_reset = devm_reset_control_get_exclusive(&pdev->dev, NULL); > if (IS_ERR(hsphy->phy_reset)) { > -- > 2.40.1 >
This series contains a few fixes for the qcom-snps-femto-v2 driver, notably: - make sure ref_clk is properly enabled - add system sleep PM ops to disable the clocks on system suspend v2 -> v3 - "phy: qcom-snps-femto-v2: add system sleep PM ops" - add link to downstream driver used as reference (Andrew Halaney) - add commit "phy: qcom-snps-femto-v2: use qcom_snps_hsphy_do_suspend/resume error code" to make sure PM ops don't always return 0 (Andrew Halaney) v1 -> v2 - keep cfg_ahb clock and use clk_bulk API to handle both cfg_ahb and ref clocks (Bjorn Andersson) - add system sleep PM callbacks (Bjorn Andersson) - add Link: and Fixes: tag (Andrew Halaney) Adrien Thierry (3): phy: qcom-snps-femto-v2: properly enable ref clock phy: qcom-snps-femto-v2: add system sleep PM ops phy: qcom-snps-femto-v2: use qcom_snps_hsphy_do_suspend/resume error code drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 87 +++++++++++++------ 1 file changed, 59 insertions(+), 28 deletions(-)