linux-kernel - Re: [PATCH 2/5] drm/msm/dsi: Remove repeated calculation of slice_per

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Date:   Tue, 4 Oct 2022 07:41:09 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        <phone-devel@...r.kernel.org>, Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Vinod Koul <vkoul@...nel.org>
CC:     <~postmarketos/upstreaming@...ts.sr.ht>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Sean Paul <sean@...rly.run>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Alex Deucher <alexander.deucher@....com>,
        Douglas Anderson <dianders@...omium.org>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <freedreno@...ts.freedesktop.org>,
        Marek Vasut <marex@...x.de>
Subject: Re: [PATCH 2/5] drm/msm/dsi: Remove repeated calculation of
 slice_per_intf



On 10/1/2022 12:08 PM, 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@...ainline.org>

LGTM,

Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>

> ---
>   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;