On Mon, 7 Jun 2021 10:58:36 +0200 Ondrej Jirman <megous@xxxxxxxxxx> wrote: Hi, > From: Saravana Kannan <saravanak@xxxxxxxxxx> > > On sunxi boards that use HDMI output, HDMI device probe keeps being > avoided indefinitely with these repeated messages in dmesg: > > platform 1ee0000.hdmi: probe deferral - supplier 1ef0000.hdmi-phy > not ready > > There's a fwnode_link being created with fw_devlink=on between hdmi > and hdmi-phy nodes, because both nodes have 'compatible' property set. > > Fw_devlink code assumes that nodes that have compatible property > set will also have a device associated with them by some driver > eventually. This is not the case with the current sun8i-hdmi > driver. > > This commit makes sun8i-hdmi-phy into a proper platform device > and fixes the display pipeline probe on sunxi boards that use HDMI. > > More context: https://lkml.org/lkml/2021/5/16/203 > > Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx> > Signed-off-by: Ondrej Jirman <megous@xxxxxxxxxx> Many thanks to both of you for fixing this! I just tested this on a Pine64-LTS (A64), Pine-H64 (H6) and OrangePi PC2 (H5). On all boards this patch brings back HDMI video output for me. Since this is a regression introduced with 5.13-rc1, we should merge this ASAP. Tested-by: Andre Przywara <andre.przywara@xxxxxxx> Cheers, Andre > --- > v2: Fix building as a module (phy and hdmi are part of the same module, so > module init callbacks need to be shared) > > drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 31 ++++++++++++++++--- > drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h | 5 ++-- > drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 41 ++++++++++++++++++++++---- > 3 files changed, 66 insertions(+), 11 deletions(-) > > diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c > index bbdfd5e26ec88..f75fb157f2ff7 100644 > --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c > +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c > @@ -209,7 +209,7 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master, > goto err_disable_clk_tmds; > } > > - ret = sun8i_hdmi_phy_probe(hdmi, phy_node); > + ret = sun8i_hdmi_phy_get(hdmi, phy_node); > of_node_put(phy_node); > if (ret) { > dev_err(dev, "Couldn't get the HDMI PHY\n"); > @@ -242,7 +242,6 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master, > > cleanup_encoder: > drm_encoder_cleanup(encoder); > - sun8i_hdmi_phy_remove(hdmi); > err_disable_clk_tmds: > clk_disable_unprepare(hdmi->clk_tmds); > err_assert_ctrl_reset: > @@ -263,7 +262,6 @@ static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master, > struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev); > > dw_hdmi_unbind(hdmi->hdmi); > - sun8i_hdmi_phy_remove(hdmi); > clk_disable_unprepare(hdmi->clk_tmds); > reset_control_assert(hdmi->rst_ctrl); > gpiod_set_value(hdmi->ddc_en, 0); > @@ -320,7 +318,32 @@ static struct platform_driver sun8i_dw_hdmi_pltfm_driver = { > .of_match_table = sun8i_dw_hdmi_dt_ids, > }, > }; > -module_platform_driver(sun8i_dw_hdmi_pltfm_driver); > + > +static int __init sun8i_dw_hdmi_init(void) > +{ > + int ret; > + > + ret = platform_driver_register(&sun8i_dw_hdmi_pltfm_driver); > + if (ret) > + return ret; > + > + ret = platform_driver_register(&sun8i_hdmi_phy_driver); > + if (ret) { > + platform_driver_unregister(&sun8i_dw_hdmi_pltfm_driver); > + return ret; > + } > + > + return ret; > +} > + > +static void __exit sun8i_dw_hdmi_exit(void) > +{ > + platform_driver_unregister(&sun8i_dw_hdmi_pltfm_driver); > + platform_driver_unregister(&sun8i_hdmi_phy_driver); > +} > + > +module_init(sun8i_dw_hdmi_init); > +module_exit(sun8i_dw_hdmi_exit); > > MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@xxxxxxxx>"); > MODULE_DESCRIPTION("Allwinner DW HDMI bridge"); > diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h > index d4b55af0592f8..74f6ed0e25709 100644 > --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h > +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h > @@ -195,14 +195,15 @@ struct sun8i_dw_hdmi { > struct gpio_desc *ddc_en; > }; > > +extern struct platform_driver sun8i_hdmi_phy_driver; > + > static inline struct sun8i_dw_hdmi * > encoder_to_sun8i_dw_hdmi(struct drm_encoder *encoder) > { > return container_of(encoder, struct sun8i_dw_hdmi, encoder); > } > > -int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node); > -void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi); > +int sun8i_hdmi_phy_get(struct sun8i_dw_hdmi *hdmi, struct device_node *node); > > void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy); > void sun8i_hdmi_phy_set_ops(struct sun8i_hdmi_phy *phy, > diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c > index 9994edf675096..c9239708d398c 100644 > --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c > +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c > @@ -5,6 +5,7 @@ > > #include <linux/delay.h> > #include <linux/of_address.h> > +#include <linux/of_platform.h> > > #include "sun8i_dw_hdmi.h" > > @@ -597,10 +598,30 @@ static const struct of_device_id sun8i_hdmi_phy_of_table[] = { > { /* sentinel */ } > }; > > -int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node) > +int sun8i_hdmi_phy_get(struct sun8i_dw_hdmi *hdmi, struct device_node *node) > +{ > + struct platform_device *pdev = of_find_device_by_node(node); > + struct sun8i_hdmi_phy *phy; > + > + if (!pdev) > + return -EPROBE_DEFER; > + > + phy = platform_get_drvdata(pdev); > + if (!phy) > + return -EPROBE_DEFER; > + > + hdmi->phy = phy; > + > + put_device(&pdev->dev); > + > + return 0; > +} > + > +static int sun8i_hdmi_phy_probe(struct platform_device *pdev) > { > const struct of_device_id *match; > - struct device *dev = hdmi->dev; > + struct device *dev = &pdev->dev; > + struct device_node *node = dev->of_node; > struct sun8i_hdmi_phy *phy; > struct resource res; > void __iomem *regs; > @@ -704,7 +725,7 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node) > clk_prepare_enable(phy->clk_phy); > } > > - hdmi->phy = phy; > + platform_set_drvdata(pdev, phy); > > return 0; > > @@ -728,9 +749,9 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node) > return ret; > } > > -void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi) > +static int sun8i_hdmi_phy_remove(struct platform_device *pdev) > { > - struct sun8i_hdmi_phy *phy = hdmi->phy; > + struct sun8i_hdmi_phy *phy = platform_get_drvdata(pdev); > > clk_disable_unprepare(phy->clk_mod); > clk_disable_unprepare(phy->clk_bus); > @@ -744,4 +765,14 @@ void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi) > clk_put(phy->clk_pll1); > clk_put(phy->clk_mod); > clk_put(phy->clk_bus); > + return 0; > } > + > +struct platform_driver sun8i_hdmi_phy_driver = { > + .probe = sun8i_hdmi_phy_probe, > + .remove = sun8i_hdmi_phy_remove, > + .driver = { > + .name = "sun8i-hdmi-phy", > + .of_match_table = sun8i_hdmi_phy_of_table, > + }, > +};
