[PATCH v7 10/24] drm/rockchip: dw_hdmi: Add support for hclk

[Dmitry Osipenko]

25.02.2022 10:51, Sascha Hauer пишет:
> The rk3568 HDMI has an additional clock that needs to be enabled for the
> HDMI controller to work. The purpose of that clock is not clear. It is
> named "hclk" in the downstream driver, so use the same name.
> 
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> ---
> 
> Notes:
>     Changes since v5:
>     - Use devm_clk_get_optional rather than devm_clk_get
> 
>  drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> index fe4f9556239ac..c6c00e8779ab5 100644
> --- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> @@ -76,6 +76,7 @@ struct rockchip_hdmi {
>  	const struct rockchip_hdmi_chip_data *chip_data;
>  	struct clk *ref_clk;
>  	struct clk *grf_clk;
> +	struct clk *hclk_clk;
>  	struct dw_hdmi *hdmi;
>  	struct regulator *avdd_0v9;
>  	struct regulator *avdd_1v8;
> @@ -229,6 +230,14 @@ static int rockchip_hdmi_parse_dt(struct rockchip_hdmi *hdmi)
>  		return PTR_ERR(hdmi->grf_clk);
>  	}
>  
> +	hdmi->hclk_clk = devm_clk_get_optional(hdmi->dev, "hclk");
> +	if (PTR_ERR(hdmi->hclk_clk) == -EPROBE_DEFER) {

Have you tried to investigate the hclk? I'm still thinking that's not
only HDMI that needs this clock and then the hardware description
doesn't look correct.