[PATCH v3 2/5] drm/msm/dsi: Adjust pclk rate for compression

[Jessica Zhang]

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

Signed-off-by: Jessica Zhang <quic_jessz...@quicinc.com>
---
 drivers/gpu/drm/msm/dsi/dsi_host.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c 
b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 18d38b90eb28..d04f8bbd707d 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -561,7 +561,18 @@ 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_compressed_pclk(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);
+
+       return (new_hdisplay + (mode->htotal - mode->hdisplay))
+                       * 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;
 
@@ -576,6 +587,10 @@ 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)
+               pclk_rate = dsi_adjust_compressed_pclk(mode, dsc);
+
        return pclk_rate;
 }
 
@@ -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);
        u64 pclk_bpp = (u64)pclk_rate * 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);
 
@@ -634,7 +649,7 @@ 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