linux-kernel - Re: [PATCH v2 5/7] drm/msm/mdp4: move move_valid callback to lcdc

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Message-ID: <00659634-c602-4382-b4a7-ef32f4d27dbf@oss.qualcomm.com>
Date: Thu, 20 Feb 2025 15:19:06 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        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>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/7] drm/msm/mdp4: move move_valid callback to
 lcdc_encoder

On 20.02.2025 12:14 PM, Dmitry Baryshkov wrote:
> We can check the LCDC clock directly from the LCDC encoder driver, so
> remove it from the LVDS connector.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.h           |  1 -
>  drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c  | 27 ++++++++++++++++------
>  .../gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c    | 21 -----------------
>  3 files changed, 20 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.h b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.h
> index b8bdc3712c73b14f3547dce3439a895e3d10f193..e0380d3b7e0cee99c4c376bf6369887106f44ede 100644
> --- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.h
> +++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.h
> @@ -191,7 +191,6 @@ struct drm_crtc *mdp4_crtc_init(struct drm_device *dev,
>  long mdp4_dtv_round_pixclk(struct drm_encoder *encoder, unsigned long rate);
>  struct drm_encoder *mdp4_dtv_encoder_init(struct drm_device *dev);
>  
> -long mdp4_lcdc_round_pixclk(struct drm_encoder *encoder, unsigned long rate);
>  struct drm_encoder *mdp4_lcdc_encoder_init(struct drm_device *dev,
>  		struct device_node *panel_node);
>  
> diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
> index db93795916cdaa87ac8e61d3b44c2dadac10fd9e..cfcedd8a635cf0297365e845ef415a8f0d553183 100644
> --- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
> @@ -348,19 +348,32 @@ static void mdp4_lcdc_encoder_enable(struct drm_encoder *encoder)
>  	mdp4_lcdc_encoder->enabled = true;
>  }
>  
> +static enum drm_mode_status
> +mdp4_lcdc_encoder_mode_valid(struct drm_encoder *encoder,
> +		const struct drm_display_mode *mode)
> +{
> +	struct mdp4_lcdc_encoder *mdp4_lcdc_encoder =
> +			to_mdp4_lcdc_encoder(encoder);

Crazy linebreak

> +	long actual, requested;
> +
> +	requested = 1000 * mode->clock;
> +	actual = clk_round_rate(mdp4_lcdc_encoder->lcdc_clk, requested);
> +
> +	DBG("requested=%ld, actual=%ld", requested, actual);
> +
> +	if (actual != requested)
> +		return MODE_CLOCK_RANGE;
> +
> +	return MODE_OK;
> +}

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad