linux-kernel - Re: [PATCH v2 1/2] drm/bridge: sii902x: Fix mode

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Date: Fri, 24 May 2024 10:18:24 +0200
From: Sam Ravnborg <sam@...nborg.org>
To: Jayesh Choudhary <j-choudhary@...com>
Cc: linux-kernel@...r.kernel.org, andrzej.hajda@...el.com,
	neil.armstrong@...aro.org, rfoss@...nel.org,
	Laurent.pinchart@...asonboard.com, mripard@...nel.org,
	dri-devel@...ts.freedesktop.org, jonas@...boo.se,
	jernej.skrabec@...il.com, maarten.lankhorst@...ux.intel.com,
	tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
	a-bhatia1@...com
Subject: Re: [PATCH v2 1/2] drm/bridge: sii902x: Fix mode_valid hook

Hi Jayesh,

On Fri, May 24, 2024 at 01:03:04PM +0530, Jayesh Choudhary wrote:
> Currently, mode_valid hook returns all mode as valid and it is
> defined only in drm_connector_helper_funcs. With the introduction of
> 'DRM_BRIDGE_ATTACH_NO_CONNECTOR', connector is not initialized in
> bridge_attach call for cases when the encoder has this flag enabled.
> So add the mode_valid hook in drm_bridge_funcs as well with proper
> clock checks for maximum and minimum pixel clock supported by the
> bridge.
> 
> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
> ---
>  drivers/gpu/drm/bridge/sii902x.c | 38 ++++++++++++++++++++++++++++++--
>  1 file changed, 36 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> index 2fbeda9025bf..ef7c3ab3386c 100644
> --- a/drivers/gpu/drm/bridge/sii902x.c
> +++ b/drivers/gpu/drm/bridge/sii902x.c
> @@ -163,6 +163,14 @@
>  
>  #define SII902X_AUDIO_PORT_INDEX		3
>  
> +/*
> + * The maximum resolution supported by the HDMI bridge is 1080p@...z
> + * and 1920x1200 requiring a pixel clock of 165MHz and the minimum
> + * resolution supported is 480p@...z requiring a pixel clock of 25MHz
> + */
> +#define SII902X_MIN_PIXEL_CLOCK_KHZ		25000
> +#define SII902X_MAX_PIXEL_CLOCK_KHZ		165000
> +
>  struct sii902x {
>  	struct i2c_client *i2c;
>  	struct regmap *regmap;
> @@ -310,12 +318,26 @@ static int sii902x_get_modes(struct drm_connector *connector)
>  	return num;
>  }
>  
> +static enum
> +drm_mode_status sii902x_validate(struct sii902x *sii902x,
> +				 const struct drm_display_mode *mode)
> +{
> +	if (mode->clock < SII902X_MIN_PIXEL_CLOCK_KHZ)
> +		return MODE_CLOCK_LOW;
> +
> +	if (mode->clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
> +		return MODE_CLOCK_HIGH;
> +
> +	return MODE_OK;
> +}
> +
>  static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
>  					       struct drm_display_mode *mode)
>  {
> -	/* TODO: check mode */
> +	struct sii902x *sii902x = connector_to_sii902x(connector);
> +	const struct drm_display_mode *mod = mode;
>  
> -	return MODE_OK;
> +	return sii902x_validate(sii902x, mod);
>  }
>  
>  static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
> @@ -499,11 +521,22 @@ static int sii902x_bridge_atomic_check(struct drm_bridge *bridge,
>  	 * There might be flags negotiation supported in future but
>  	 * set the bus flags in atomic_check statically for now.
>  	 */
> +
>  	bridge_state->input_bus_cfg.flags = bridge->timings->input_bus_flags;

If you spin a v2 then drop the above change as you delete the line again
in the next patch.

	Sam