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

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Date: Fri, 24 May 2024 14:51:03 +0530
From: Jayesh Choudhary <j-choudhary@...com>
To: Sam Ravnborg <sam@...nborg.org>
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

Hello Sam,

On 24/05/24 13:48, Sam Ravnborg wrote:
> 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

While splitting the patches, I must have messed up.
I will quickly send v3 with this fixed.

Thanks,
Jayesh