linux-kernel - Re: [PATCH v2 1/4] drm/msm/dsi: Adjust pclk rate for compression

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Date:   Fri, 5 May 2023 14:49:08 -0700
From:   Jessica Zhang <quic_jesszhan@...cinc.com>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Marijn Suijten <marijn.suijten@...ainline.org>
CC:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] drm/msm/dsi: Adjust pclk rate for compression



On 5/5/2023 2:23 PM, Jessica Zhang wrote:
> Adjust the pclk rate to divide hdisplay by the compression ratio when DSC
> is enabled.
> 
> Changes in v2:
> - Adjusted pclk_rate math to divide only the hdisplay value by
>    compression ratio
> 
> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
> ---
>   drivers/gpu/drm/msm/dsi/dsi_host.c | 17 +++++++++++++----
>   1 file changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 43a5ec33eee8..0e5778e8091f 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -561,7 +561,8 @@ void dsi_link_clk_disable_v2(struct msm_dsi_host *msm_host)
>   	clk_disable_unprepare(msm_host->byte_clk);
>   }
>   
> -static unsigned long dsi_get_pclk_rate(const struct drm_display_mode *mode, bool is_bonded_dsi)
> +static unsigned long dsi_get_pclk_rate(const struct drm_display_mode *mode,
> +		struct drm_dsc_config *dsc, bool is_bonded_dsi)
>   {
>   	unsigned long pclk_rate;
>   
> @@ -576,6 +577,14 @@ static unsigned long dsi_get_pclk_rate(const struct drm_display_mode *mode, bool
>   	if (is_bonded_dsi)
>   		pclk_rate /= 2;
>   
> +	/* If DSC is enabled, divide hdisplay by compression ratio */
> +	if (dsc) {
> +		int new_hdisplay = DIV_ROUND_UP(mode->hdisplay * msm_dsc_get_bpp_int(dsc),
> +				dsc->bits_per_component * 3);
> +		int fps = DIV_ROUND_UP(pclk_rate, mode->htotal * mode->vtotal);

Should've used drm_mode_vrefresh() here... Will spin a v3 with that 
change (along with any additional comments)

> +		pclk_rate = (new_hdisplay + (mode->htotal - mode->hdisplay)) * mode->vtotal * fps;
> +	}
> +
>   	return pclk_rate;
>   }
>   
> @@ -585,7 +594,7 @@ unsigned long dsi_byte_clk_get_rate(struct mipi_dsi_host *host, bool is_bonded_d
>   	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
>   	u8 lanes = msm_host->lanes;
>   	u32 bpp = dsi_get_bpp(msm_host->format);
> -	unsigned long pclk_rate = dsi_get_pclk_rate(mode, is_bonded_dsi);
> +	unsigned long pclk_rate = dsi_get_pclk_rate(mode, msm_host->dsc, is_bonded_dsi);
>   	u64 pclk_bpp = (u64)pclk_rate * bpp;
>   
>   	if (lanes == 0) {
> @@ -604,7 +613,7 @@ unsigned long dsi_byte_clk_get_rate(struct mipi_dsi_host *host, bool is_bonded_d
>   
>   static void dsi_calc_pclk(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
>   {
> -	msm_host->pixel_clk_rate = dsi_get_pclk_rate(msm_host->mode, is_bonded_dsi);
> +	msm_host->pixel_clk_rate = dsi_get_pclk_rate(msm_host->mode, msm_host->dsc, is_bonded_dsi);
>   	msm_host->byte_clk_rate = dsi_byte_clk_get_rate(&msm_host->base, is_bonded_dsi,
>   							msm_host->mode);
>   
> @@ -634,7 +643,7 @@ int dsi_calc_clk_rate_v2(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
>   
>   	dsi_calc_pclk(msm_host, is_bonded_dsi);
>   
> -	pclk_bpp = (u64)dsi_get_pclk_rate(msm_host->mode, is_bonded_dsi) * bpp;
> +	pclk_bpp = (u64)dsi_get_pclk_rate(msm_host->mode, msm_host->dsc, is_bonded_dsi) * bpp;
>   	do_div(pclk_bpp, 8);
>   	msm_host->src_clk_rate = pclk_bpp;
>   
> 
> -- 
> 2.40.1
>