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

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Message-ID: <haqi67z7i6lleb3i7b2ksqkq2gyag26fev4gj3sqtds6qtqrzd@k25h6jive5f5>
Date: Mon, 13 Jan 2025 23:20:05 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
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 Mon, Jan 13, 2025 at 09:12:02PM +0530, Aradhya Bhatia wrote:
> 
> 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.

SGTM

> 
> 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
> >>
> > 

-- 
With best wishes
Dmitry