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drm/msm/dsi: Reduce pclk rate for compression

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

Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Abhinav 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: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
This commit is contained in:
Jessica Zhang 2023-06-09 15:57:14 -07:00 committed by Dmitry Baryshkov
parent 21bf617110
commit 7c9e4a554d
1 changed files with 18 additions and 3 deletions
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21
drivers/gpu/drm/msm/dsi/dsi_host.c
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@ -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);