linux-kernel - Re: [PATCH 2/4] drm/panel: ilitek-ili9881c: Add support for two-lane configuration

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Message-ID: <nvfgrdmynquuwub3qy26zqyztb7ze3u74vv53tmk5xoltruw5c@nnbw3heppqd7>
Date: Thu, 10 Apr 2025 12:47:38 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
        Jessica Zhang <quic_jesszhan@...cinc.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>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 2/4] drm/panel: ilitek-ili9881c: Add support for two-lane
 configuration

On Thu, Apr 10, 2025 at 12:34:15PM +0300, Dmitry Baryshkov wrote:
> On Tue, Apr 08, 2025 at 05:27:01PM +0200, Kory Maincent wrote:
> > Enable support for two-lane configuration which is done by setting the
> > LANSEL_SW_EN and LANSEL_SW bits in the Pad Control register.
> > 
> > Use the dsi-lanes device tree parameter to configure the number of lanes.
> > The default configuration remains set to four lanes.
> > 
> > Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
> > ---
> >  drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 35 +++++++++++++++++++++++++--
> >  1 file changed, 33 insertions(+), 2 deletions(-)
> > 
> > @@ -1504,7 +1523,7 @@ static const struct drm_panel_funcs ili9881c_funcs = {
> >  static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
> >  {
> >  	struct ili9881c *ctx;
> > -	int ret;
> > +	int ret, lanes;
> >  
> >  	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
> >  	if (!ctx)
> > @@ -1545,11 +1564,23 @@ static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
> >  	if (ret)
> >  		return ret;
> >  
> > +	ret = of_property_read_u32(dsi->dev.of_node, "dsi-lanes", &lanes);
> 
> Use dsi->lanes instead.

Please ignore this comment :-)

> 

-- 
With best wishes
Dmitry