linux-kernel - Re: [PATCH] drm/bridge: ite-it6263: Support VESA input format

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Message-ID: <054a0278-428f-49cb-b0f0-182c5bb3b61b@nxp.com>
Date: Wed, 4 Dec 2024 11:42:51 +0800
From: Liu Ying <victor.liu@....com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, tomm.merciai@...il.com
Cc: linux-renesas-soc@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 biju.das.jz@...renesas.com,
 Tommaso Merciai <tommaso.merciai.xr@...renesas.com>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: ite-it6263: Support VESA input format

On 12/04/2024, Dmitry Baryshkov wrote:
> On Tue, Dec 03, 2024 at 06:21:29PM +0100, tomm.merciai@...il.com wrote:
>> From: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
>>
>> Introduce it6263_is_input_bus_fmt_valid() and refactor the
>> it6263_bridge_atomic_get_input_bus_fmts() function to support VESA
>> format by selecting the LVDS input format based on the LVDS data mapping
>> and thereby support both JEIDA and VESA input formats.
> 
> For the patch itself,
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> 
> A more generic question: is the bridge limited to 4 lanes or does it
> support 3-lane or 5-lane configurations?

According to ite,it6263.yaml, the bridge supports all the data
mappings(jeida-{18,24,30} and vesa-{24,30}) listed in
lvds-data-mapping.yaml.  lvds-data-mapping.yaml specifies the
data lanes(3/4/5) used by each of the data mappings.  So, the
bridge supports 3, 4 or 5 data lanes.
 
> 
>>
>> Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
>> ---
>>  drivers/gpu/drm/bridge/ite-it6263.c | 25 ++++++++++++++++++++++---
>>  1 file changed, 22 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/ite-it6263.c b/drivers/gpu/drm/bridge/ite-it6263.c
>> index cbabd4e20d3e..83d1db29157a 100644
>> --- a/drivers/gpu/drm/bridge/ite-it6263.c
>> +++ b/drivers/gpu/drm/bridge/ite-it6263.c
>> @@ -48,6 +48,7 @@
>>  #define  REG_COL_DEP			GENMASK(1, 0)
>>  #define  BIT8				FIELD_PREP(REG_COL_DEP, 1)
>>  #define  OUT_MAP			BIT(4)
>> +#define  VESA				BIT(4)
>>  #define  JEIDA				0
>>  #define  REG_DESSC_ENB			BIT(6)
>>  #define  DMODE				BIT(7)
>> @@ -428,12 +429,30 @@ static inline void it6263_lvds_reset(struct it6263 *it)
>>  	fsleep(10000);
>>  }
>>  
>> +static bool it6263_is_input_bus_fmt_valid(u32 input_fmt)
>> +{
>> +	switch (input_fmt) {
>> +	case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
>> +	case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
>> +		return true;
>> +	}
>> +	return false;
>> +}
>> +
> 

-- 
Regards,
Liu Ying