linux-kernel - Re: [PATCH v6 05/12] drm/bridge: cdns-dsi: Fix the clock variable for mode

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Message-ID: <c552b800-b3d5-477c-b7f8-53761e40ea36@linux.dev>
Date: Mon, 13 Jan 2025 21:12:02 +0530
From: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 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>,
 Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
 Devarsh Thakkar <devarsht@...com>, Praneeth Bajjuri <praneeth@...com>,
 Udit Kumar <u-kumar1@...com>, Jayesh Choudhary <j-choudhary@...com>,
 DRI Development List <dri-devel@...ts.freedesktop.org>,
 Linux Kernel List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 05/12] drm/bridge: cdns-dsi: Fix the clock variable for
 mode_valid()


On 1/13/25 15:10, Dmitry Baryshkov wrote:
> On Sun, Jan 12, 2025 at 12:57:31AM +0530, Aradhya Bhatia wrote:
>> From: Aradhya Bhatia <a-bhatia1@...com>
>>
>> Allow the D-Phy config checks to use mode->clock instead of
>> mode->crtc_clock during mode_valid checks, like everywhere else in the
>> driver.
> 
> Please describe why, not what.

It is unclear why the rest of the code uses mode->crtc_* parameters at
all during the non mode validation phase.

But during that phase, the crtc_* parameters are not generated
(duplicated in this case) from the regular ones, and so the validation
fails. The patch prevents that from happening by streamlining with
other instances.

I will update the commit text with this.

Regards
Aradhya

> 
>>
>> Fixes: fced5a364dee ("drm/bridge: cdns: Convert to phy framework")
>> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
>> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
>> Signed-off-by: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
>> ---
>>  drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
>> index 3b3c45df1399..9c743fde2861 100644
>> --- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
>> +++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
>> @@ -568,13 +568,14 @@ static int cdns_dsi_check_conf(struct cdns_dsi *dsi,
>>  	struct phy_configure_opts_mipi_dphy *phy_cfg = &output->phy_opts.mipi_dphy;
>>  	unsigned long dsi_hss_hsa_hse_hbp;
>>  	unsigned int nlanes = output->dev->lanes;
>> +	int mode_clock = (mode_valid_check ? mode->clock : mode->crtc_clock);
>>  	int ret;
>>  
>>  	ret = cdns_dsi_mode2cfg(dsi, mode, dsi_cfg, mode_valid_check);
>>  	if (ret)
>>  		return ret;
>>  
>> -	phy_mipi_dphy_get_default_config(mode->crtc_clock * 1000,
>> +	phy_mipi_dphy_get_default_config(mode_clock * 1000,
>>  					 mipi_dsi_pixel_format_to_bpp(output->dev->format),
>>  					 nlanes, phy_cfg);
>>  
>> -- 
>> 2.34.1
>>
>