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SubjectRe: [PATCH v2 1/4] drm/msm/dsi: Adjust pclk rate for compression
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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@quicinc.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
>

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