linux-kernel - Re: [PATCH v8 1/4] drm/msm/dpu: adjust display_v

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Date:   Fri, 18 Feb 2022 00:43:56 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run, swboyd@...omium.org, vkoul@...nel.org,
        daniel@...ll.ch, airlied@...ux.ie, agross@...nel.org,
        bjorn.andersson@...aro.org, quic_abhinavk@...cinc.com,
        quic_aravindh@...cinc.com, quic_sbillaka@...cinc.com,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jonathan Marek <jonathan@...ek.ca>
Subject: Re: [PATCH v8 1/4] drm/msm/dpu: adjust display_v_end for eDP and DP

On Fri, 18 Feb 2022 at 00:36, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
>
> The “DP timing” requires the active region to be defined in the
> bottom-right corner of the frame dimensions which is different
> with DSI. Therefore both display_h_end and display_v_end need
> to be adjusted accordingly. However current implementation has
> only display_h_end adjusted.
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>

Fixes: fc3a69ec68d3 ("drm/msm/dpu: intf timing path for displayport")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> index 116e2b5..284f561 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> @@ -148,6 +148,7 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>                 active_v_end = active_v_start + (p->yres * hsync_period) - 1;
>
>                 display_v_start += p->hsync_pulse_width + p->h_back_porch;
> +               display_v_end   -= p->h_front_porch;
>
>                 active_hctl = (active_h_end << 16) | active_h_start;
>                 display_hctl = active_hctl;
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>


-- 
With best wishes
Dmitry