Re: [PATCH v7 2/7] drm/msm/hdmi: program HDMI timings during atomic_pre_enable

[Abhinav Kumar]

On 2/7/2025 4:27 PM, Dmitry Baryshkov wrote:
> The mode_set callback is deprecated, it doesn't get the
> drm_bridge_state, just mode-related argumetns. Also Abhinav pointed out
> that HDMI timings should be programmed after setting up HDMI PHY and
> PLL. Rework the code to program HDMI timings at the end of
> atomic_pre_enable().

I think now this needs to be changed that, program the HDMI timings at 
the beginning of atomic_pre_enable() to match the location of mode_set()

With that fixed,

Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>

> Reviewed-by: Maxime Ripard <mripard@xxxxxxxxxx>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> ---
>   drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 24 ++++++++++++++++--------
>   1 file changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> index d839c71091dcdc3b020fcbba8d698d58ee7fc749..bd94b3a70f0e5e457a88f089b491103a8c09567b 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> @@ -126,15 +126,29 @@ static void msm_hdmi_config_avi_infoframe(struct hdmi *hdmi)
>   	hdmi_write(hdmi, REG_HDMI_INFOFRAME_CTRL1, val);
>   }
>   
> +static void msm_hdmi_set_timings(struct hdmi *hdmi,
> +				 const struct drm_display_mode *mode);
> +
>   static void msm_hdmi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
>   					      struct drm_bridge_state *old_bridge_state)
>   {
> +	struct drm_atomic_state *state = old_bridge_state->base.state;
>   	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
>   	struct hdmi *hdmi = hdmi_bridge->hdmi;
>   	struct hdmi_phy *phy = hdmi->phy;
> +	struct drm_encoder *encoder = bridge->encoder;
> +	struct drm_connector *connector;
> +	struct drm_connector_state *conn_state;
> +	struct drm_crtc_state *crtc_state;
>   
>   	DBG("power up");
>   
> +	connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
> +	conn_state = drm_atomic_get_new_connector_state(state, connector);
> +	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
> +
> +	msm_hdmi_set_timings(hdmi, &crtc_state->adjusted_mode);
> +
>   	if (!hdmi->power_on) {
>   		msm_hdmi_phy_resource_enable(phy);
>   		msm_hdmi_power_on(bridge);
> @@ -177,17 +191,12 @@ static void msm_hdmi_bridge_atomic_post_disable(struct drm_bridge *bridge,
>   	}
>   }
>   
> -static void msm_hdmi_bridge_mode_set(struct drm_bridge *bridge,
> -		 const struct drm_display_mode *mode,
> -		 const struct drm_display_mode *adjusted_mode)
> +static void msm_hdmi_set_timings(struct hdmi *hdmi,
> +				 const struct drm_display_mode *mode)
>   {
> -	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
> -	struct hdmi *hdmi = hdmi_bridge->hdmi;
>   	int hstart, hend, vstart, vend;
>   	uint32_t frame_ctrl;
>   
> -	mode = adjusted_mode;
> -
>   	hdmi->pixclock = mode->clock * 1000;
>   
>   	hstart = mode->htotal - mode->hsync_start;
> @@ -306,7 +315,6 @@ static const struct drm_bridge_funcs msm_hdmi_bridge_funcs = {
>   	.atomic_reset = drm_atomic_helper_bridge_reset,
>   	.atomic_pre_enable = msm_hdmi_bridge_atomic_pre_enable,
>   	.atomic_post_disable = msm_hdmi_bridge_atomic_post_disable,
> -	.mode_set = msm_hdmi_bridge_mode_set,
>   	.mode_valid = msm_hdmi_bridge_mode_valid,
>   	.edid_read = msm_hdmi_bridge_edid_read,
>   	.detect = msm_hdmi_bridge_detect,