linux-kernel - Re: [PATCH v5 1/3] drm/bridge: sii902x: Fix mode

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Date: Thu, 13 Jun 2024 14:19:55 +0530
From: Aradhya Bhatia <a-bhatia1@...com>
To: Jayesh Choudhary <j-choudhary@...com>, <linux-kernel@...r.kernel.org>,
        <dmitry.baryshkov@...aro.org>, <sui.jingfeng@...ux.dev>,
        <andrzej.hajda@...el.com>, <neil.armstrong@...aro.org>,
        <rfoss@...nel.org>, <Laurent.pinchart@...asonboard.com>,
        <mripard@...nel.org>, <sam@...nborg.org>
CC: <jonas@...boo.se>, <jernej.skrabec@...il.com>,
        <maarten.lankhorst@...ux.intel.com>, <tzimmermann@...e.de>,
        <airlied@...il.com>, <daniel@...ll.ch>,
        <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v5 1/3] drm/bridge: sii902x: Fix mode_valid hook

Hi Jayesh,

Thanks for the patches!

On 13-Jun-24 14:08, Jayesh Choudhary wrote:
> Currently, mode_valid is defined only in drm_connector_helper_funcs.
> When the bridge is attached with the 'DRM_BRIDGE_ATTACH_NO_CONNECTOR'
> flag, the connector is not initialized, and so is the mode_valid
> hook under connector helper funcs.
> It also returns MODE_OK for all modes without actually checking the
> modes.
> So move the mode_valid hook to drm_bridge_funcs with proper clock
> checks for maximum and minimum pixel clock supported by the bridge.
> 
> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Acked-by: Sui Jingfeng <sui.jingfeng@...ux.dev>
> ---
>  drivers/gpu/drm/bridge/sii902x.c | 32 +++++++++++++++++++++++---------
>  1 file changed, 23 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> index 2fbeda9025bf..6a6055a4ccf9 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;
> @@ -310,17 +318,8 @@ static int sii902x_get_modes(struct drm_connector *connector)
>  	return num;
>  }
>  
> -static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
> -					       struct drm_display_mode *mode)
> -{
> -	/* TODO: check mode */
> -
> -	return MODE_OK;
> -}
> -
>  static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
>  	.get_modes = sii902x_get_modes,
> -	.mode_valid = sii902x_mode_valid,
>  };
>  
>  static void sii902x_bridge_disable(struct drm_bridge *bridge)
> @@ -504,6 +503,20 @@ static int sii902x_bridge_atomic_check(struct drm_bridge *bridge,
>  	return 0;
>  }
>  
> +static enum drm_mode_status
> +sii902x_bridge_mode_valid(struct drm_bridge *bridge,
> +			  const struct drm_display_info *info,
> +			  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 const struct drm_bridge_funcs sii902x_bridge_funcs = {
>  	.attach = sii902x_bridge_attach,
>  	.mode_set = sii902x_bridge_mode_set,
> @@ -516,6 +529,7 @@ static const struct drm_bridge_funcs sii902x_bridge_funcs = {
>  	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>  	.atomic_get_input_bus_fmts = sii902x_bridge_atomic_get_input_bus_fmts,
>  	.atomic_check = sii902x_bridge_atomic_check,
> +	.mode_valid = sii902x_bridge_mode_valid,
>  };
>  
>  static int sii902x_mute(struct sii902x *sii902x, bool mute)

Reviewed-by: Aradhya Bhatia <a-bhatia1@...com>

-- 
Regards
Aradhya