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Message-ID: <82b0c4a2-454b-da87-5474-ee174c94e9c0@somainline.org>
Date:   Sat, 1 Oct 2022 22:22:20 +0200
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Subject: Re: [PATCH 2/5] drm/msm/dsi: Remove repeated calculation of
 slice_per_intf
Content-Language: en-US
To:     Marijn Suijten <marijn.suijten@somainline.org>,
        phone-devel@vger.kernel.org, Rob Clark <robdclark@gmail.com>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Vinod Koul <vkoul@kernel.org>
Cc:     ~postmarketos/upstreaming@lists.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@somainline.org>,
        Martin Botka <martin.botka@somainline.org>,
        Jami Kettunen <jami.kettunen@somainline.org>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        Sean Paul <sean@poorly.run>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Javier Martinez Canillas <javierm@redhat.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        Douglas Anderson <dianders@chromium.org>,
        Vladimir Lypak <vladimir.lypak@gmail.com>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org,
        Marek Vasut <marex@denx.de>
References: <20221001190807.358691-1-marijn.suijten@somainline.org>
 <20221001190807.358691-3-marijn.suijten@somainline.org>
From:   Konrad Dybcio <konrad.dybcio@somainline.org>
In-Reply-To: <20221001190807.358691-3-marijn.suijten@somainline.org>
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Precedence: bulk


On 1.10.2022 21:08, Marijn Suijten wrote:
> slice_per_intf is already computed for intf_width, which holds the same
> value as hdisplay.
> 
> Fixes: 08802f515c3c ("drm/msm/dsi: Add support for DSC configuration")
> Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>

Konrad
>  drivers/gpu/drm/msm/dsi/dsi_host.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index e05bae647431..cb6f2fa11f58 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -842,7 +842,7 @@ static void dsi_ctrl_config(struct msm_dsi_host *msm_host, bool enable,
>  static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mode, u32 hdisplay)
>  {
>  	struct drm_dsc_config *dsc = msm_host->dsc;
> -	u32 reg, intf_width, reg_ctrl, reg_ctrl2;
> +	u32 reg, reg_ctrl, reg_ctrl2;
>  	u32 slice_per_intf, total_bytes_per_intf;
>  	u32 pkt_per_line;
>  	u32 bytes_in_slice;
> @@ -851,8 +851,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
>  	/* first calculate dsc parameters and then program
>  	 * compress mode registers
>  	 */
> -	intf_width = hdisplay;
> -	slice_per_intf = DIV_ROUND_UP(intf_width, dsc->slice_width);
> +	slice_per_intf = DIV_ROUND_UP(hdisplay, dsc->slice_width);
>  
>  	/* If slice_per_pkt is greater than slice_per_intf
>  	 * then default to 1. This can happen during partial
> @@ -861,7 +860,6 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
>  	if (slice_per_intf > dsc->slice_count)
>  		dsc->slice_count = 1;
>  
> -	slice_per_intf = DIV_ROUND_UP(hdisplay, dsc->slice_width);
>  	bytes_in_slice = DIV_ROUND_UP(dsc->slice_width * dsc->bits_per_pixel, 8);
>  
>  	dsc->slice_chunk_size = bytes_in_slice;