linux-kernel - Re: [Freedreno] [PATCH 3/4] drm/msm/dp: Initialize the INTF

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Message-ID: <9c5439d61734b81eef4b1874fc10c5c8@codeaurora.org>
Date:   Fri, 28 May 2021 16:28:02 -0700
From:   abhinavk@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Stephen Boyd <swboyd@...omium.org>, sbillaka@...eaurora.org,
        Tanmay Shah <tanmay@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        freedreno@...ts.freedesktop.org,
        Chandan Uddaraju <chandanu@...eaurora.org>
Subject: Re: [Freedreno] [PATCH 3/4] drm/msm/dp: Initialize the INTF_CONFIG
 register

On 2021-05-10 21:20, Bjorn Andersson wrote:
> Some bootloaders set the widebus enable bit in the INTF_CONFIG 
> register,
> but configuration of widebus isn't yet supported ensure that the
> register has a known value, with widebus disabled.
> 
> Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support")
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Reviewed-by: Abhinav Kumar <abhinavk@...eaurora.org>
> ---
>  drivers/gpu/drm/msm/dp/dp_catalog.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c
> b/drivers/gpu/drm/msm/dp/dp_catalog.c
> index a0449a2867e4..e3996eef5518 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
> @@ -707,6 +707,7 @@ int dp_catalog_panel_timing_cfg(struct dp_catalog
> *dp_catalog)
>  	dp_write_link(catalog, REG_DP_HSYNC_VSYNC_WIDTH_POLARITY,
>  				dp_catalog->width_blanking);
>  	dp_write_link(catalog, REG_DP_ACTIVE_HOR_VER, dp_catalog->dp_active);
> +	dp_write_p0(catalog, MMSS_DP_INTF_CONFIG, 0);
>  	return 0;
>  }