Commit 7c9e4a55 authored by Jessica Zhang's avatar Jessica Zhang Committed by Dmitry Baryshkov
Browse files

drm/msm/dsi: Reduce pclk rate for compression 



Adjust the pclk rate to divide hdisplay by the compression ratio when DSC
is enabled.

Signed-off-by: default avatarJessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: default avatarAbhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/541972/
Link: https://lore.kernel.org/r/20230405-add-dsc-support-v6-2-95eab864d1b6@quicinc.com


Signed-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
parent 21bf6171

drivers/gpu/drm/msm/dsi/dsi_host.c

+18 −3
Original line number Diff line number Diff line
@@ -561,12 +561,27 @@ 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_adjust_pclk_for_compression(const struct drm_display_mode *mode,

		const struct drm_dsc_config *dsc)

{

	int new_hdisplay = DIV_ROUND_UP(mode->hdisplay * drm_dsc_get_bpp_int(dsc),

			dsc->bits_per_component * 3);



	int new_htotal = mode->htotal - mode->hdisplay + new_hdisplay;



	return new_htotal * mode->vtotal * drm_mode_vrefresh(mode);

}



static unsigned long dsi_get_pclk_rate(const struct drm_display_mode *mode,

		const struct drm_dsc_config *dsc, bool is_bonded_dsi)

{

	unsigned long pclk_rate;



	pclk_rate = mode->clock * 1000;



	if (dsc)

		pclk_rate = dsi_adjust_pclk_for_compression(mode, dsc);



	/*

	 * For bonded DSI mode, the current DRM mode has the complete width of the

	 * panel. Since, the complete panel is driven by two DSI controllers,
@@ -585,7 +600,7 @@ 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);

	unsigned long pclk_bpp;



	if (lanes == 0) {
@@ -604,7 +619,7 @@ 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);