linux-kernel - Re: [PATCH v3 09/17] drm/bridge: cdns-dsi: Drop checks that shouldn't be in .mode

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Message-ID: <8f72b42e-c38d-45fd-b04d-c2b48a809d0c@linux.dev>
Date: Tue, 15 Apr 2025 18:48:53 +0530
From: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
 Jyri Sarha <jyri.sarha@....fi>,
 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>,
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 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>,
 Jayesh Choudhary <j-choudhary@...com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-phy@...ts.infradead.org, Francesco Dolcini <francesco@...cini.it>,
 Devarsh Thakkar <devarsht@...com>
Subject: Re: [PATCH v3 09/17] drm/bridge: cdns-dsi: Drop checks that shouldn't
 be in .mode_valid()


On 14/04/25 16:41, Tomi Valkeinen wrote:
> The docs say about mode_valid():
> 
> "it is not allowed to look at anything else but the passed-in mode, and
> validate it against configuration-invariant hardware constraints"
> 
> We're doing a lot more than just looking at the mode. The main issue
> here is that we're doing checks based on the pixel clock, before we know
> what the pixel clock from the crtc actually is.
> 
> So, drop the cdns_dsi_check_conf() call from .mode_valid().
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> ---
>  drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 

Reviewed-by: Aradhya Bhatia <aradhya.bhatia@...ux.dev>

--
Regards
Aradhya