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Message-ID: <CAGETcx95bOAHiOm0MHqFWSbc8ONBPEzXbDyP82pO4B5o2QOX1A@mail.gmail.com>
Date: Tue, 15 Jun 2021 09:26:16 -0700
From: Saravana Kannan <saravanak@...gle.com>
To: Sasha Levin <sashal@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
stable <stable@...r.kernel.org>,
Ondrej Jirman <megous@...ous.com>,
Andre Przywara <andre.przywara@....com>,
Maxime Ripard <maxime@...no.tech>,
dri-devel <dri-devel@...ts.freedesktop.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
"open list:ARM/Allwinner sunXi SoC support"
<linux-sunxi@...ts.linux.dev>
Subject: Re: [PATCH AUTOSEL 5.4 07/15] drm/sun4i: dw-hdmi: Make HDMI PHY into
a platform device
On Tue, Jun 15, 2021 at 8:50 AM Sasha Levin <sashal@...nel.org> wrote:
>
> From: Saravana Kannan <saravanak@...gle.com>
>
> [ Upstream commit 9bf3797796f570b34438235a6a537df85832bdad ]
>
> 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.
>
fw_devlink isn't present in 5.4 or earlier. So technically this patch
isn't needed.
-Saravana
> 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@...gle.com>
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> Tested-by: Andre Przywara <andre.przywara@....com>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> Link: https://patchwork.freedesktop.org/patch/msgid/20210607085836.2827429-1-megous@megous.com
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
> 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 8f721be26477..cfb63cae4b12 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
> @@ -211,7 +211,7 @@ 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");
> @@ -244,7 +244,6 @@ 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:
> @@ -265,7 +264,6 @@ 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);
> @@ -322,7 +320,32 @@ 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@...l.net>");
> 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 d707c9171824..5a299a6f5aa5 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
> +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
> @@ -194,14 +194,15 @@ 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 a4012ec13d4b..c6289328c874 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"
>
> @@ -596,10 +597,30 @@ 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;
> @@ -703,7 +724,7 @@ 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;
>
> @@ -727,9 +748,9 @@ 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);
> @@ -743,4 +764,14 @@ 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,
> + },
> +};
> --
> 2.30.2
>
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