linux-kernel - Re: [PATCH v5 6/6] drm/msm/dsi: add a comment to explain pkt_per

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Message-ID: <d756ce42-3fa4-40df-b2e6-409a70aa5c2e@quicinc.com>
Date: Tue, 28 May 2024 15:19:18 -0700
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Jun Nie <jun.nie@...aro.org>, Rob Clark <robdclark@...il.com>,
        "Abhinav
 Kumar" <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Daniel
 Vetter" <daniel@...ll.ch>,
        Vinod Koul <vkoul@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        "Jonathan
 Marek" <jonathan@...ek.ca>
Subject: Re: [PATCH v5 6/6] drm/msm/dsi: add a comment to explain pkt_per_line
 encoding



On 5/27/2024 7:21 AM, Jun Nie wrote:
> From: Jonathan Marek <jonathan@...ek.ca>
> 
> Make it clear why the pkt_per_line value is being "divided by 2".
> 
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Jun Nie <jun.nie@...aro.org>

Hi Jun,

Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>

Thanks,

Jessica Zhang

> ---
>   drivers/gpu/drm/msm/dsi/dsi_host.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 7252d36687e6..4768cff08381 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -885,7 +885,11 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
>   	/* DSI_VIDEO_COMPRESSION_MODE & DSI_COMMAND_COMPRESSION_MODE
>   	 * registers have similar offsets, so for below common code use
>   	 * DSI_VIDEO_COMPRESSION_MODE_XXXX for setting bits
> +	 *
> +	 * pkt_per_line is log2 encoded, >>1 works for supported values (1,2,4)
>   	 */
> +	if (pkt_per_line > 4)
> +		drm_warn_once(msm_host->dev, "pkt_per_line too big");
>   	reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_PKT_PER_LINE(pkt_per_line >> 1);
>   	reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_EOL_BYTE_NUM(eol_byte_num);
>   	reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_EN;
> 
> -- 
> 2.34.1
>