| Message ID | 1674498274-6010-3-git-send-email-quic_khsieh@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | add display port DSC feature | expand |
Hi Kuogee,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on next-20230123]
[also build test WARNING on linus/master v6.2-rc5]
[cannot apply to drm-misc/drm-misc-next drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip v6.2-rc5 v6.2-rc4 v6.2-rc3]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Kuogee-Hsieh/drm-msm-dp-add-dpcd-read-of-both-dsc-and-fec-capability/20230124-022759
patch link: https://lore.kernel.org/r/1674498274-6010-3-git-send-email-quic_khsieh%40quicinc.com
patch subject: [PATCH v1 02/14] drm/msm/dp: add dsc factor into calculation of supported bpp
config: sparc-allyesconfig (https://download.01.org/0day-ci/archive/20230124/202301240748.RCxiAZH1-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/745d7acf9ef8affe996fce2f0658a6d95ac151fd
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Kuogee-Hsieh/drm-msm-dp-add-dpcd-read-of-both-dsc-and-fec-capability/20230124-022759
git checkout 745d7acf9ef8affe996fce2f0658a6d95ac151fd
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sparc olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sparc SHELL=/bin/bash drivers/gpu/drm/msm/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
drivers/gpu/drm/msm/dp/dp_panel.c: In function 'dp_panel_get_supported_bpp':
>> drivers/gpu/drm/msm/dp/dp_panel.c:125:34: warning: variable 'panel' set but not used [-Wunused-but-set-variable]
125 | struct dp_panel_private *panel;
| ^~~~~
vim +/panel +125 drivers/gpu/drm/msm/dp/dp_panel.c
120
121 static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel,
122 u32 mode_edid_bpp, u32 mode_pclk_khz)
123 {
124 struct dp_link_info *link_info;
> 125 struct dp_panel_private *panel;
126 const u32 max_supported_bpp = 30;
127 u32 min_supported_bpp = 18;
128 u32 bpp = 0, link_bitrate = 0, mode_bitrate;
129 s64 rate_fp = 0;
130
131 panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
132
133 if (dp_panel->dsc_en)
134 min_supported_bpp = 24;
135
136 bpp = min_t(u32, mode_edid_bpp, max_supported_bpp);
137
138 link_info = &dp_panel->link_info;
139
140 rate_fp = drm_int2fixp(link_info->num_lanes * link_info->rate * 8);
141
142 if (dp_panel->fec_en)
143 rate_fp = drm_fixp_div(rate_fp, dp_panel->fec_overhead_fp);
144
145 link_bitrate = drm_fixp2int(rate_fp);
146
147 for (; bpp > min_supported_bpp; bpp -= 6) {
148 if (dp_panel->dsc_en) {
149 if (bpp == 30 && !(dp_panel->sink_dsc_caps.color_depth & DP_DSC_10_BPC))
150 continue;
151 else if (bpp == 24 && !(dp_panel->sink_dsc_caps.color_depth & DP_DSC_8_BPC))
152 continue;
153
154 mode_bitrate = mode_pclk_khz * DSC_TGT_BPP;
155 } else {
156 mode_bitrate = mode_pclk_khz * bpp;
157 }
158
159 if (mode_bitrate <= link_bitrate)
160 break;
161 }
162
163 if (bpp < min_supported_bpp)
164 DRM_ERROR("bpp %d is below minimum supported bpp %d\n", bpp,
165 min_supported_bpp);
166
167 if (dp_panel->dsc_en && bpp != 24 && bpp != 30 && bpp != 36)
168 DRM_ERROR("bpp %d is not supported when dsc is enabled\n", bpp);
169
170 return bpp;
171 }
172
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c index 5078247..36dad05 100644 --- a/drivers/gpu/drm/msm/dp/dp_panel.c +++ b/drivers/gpu/drm/msm/dp/dp_panel.c @@ -11,7 +11,7 @@ #include <drm/drm_edid.h> #include <drm/drm_print.h> -#define DSC_TGT_BPP 8 +#define DSC_TGT_BPP 10 struct dp_panel_private { struct device *dev; @@ -122,20 +122,51 @@ static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel, u32 mode_edid_bpp, u32 mode_pclk_khz) { struct dp_link_info *link_info; - const u32 max_supported_bpp = 30, min_supported_bpp = 18; - u32 bpp = 0, data_rate_khz = 0; + struct dp_panel_private *panel; + const u32 max_supported_bpp = 30; + u32 min_supported_bpp = 18; + u32 bpp = 0, link_bitrate = 0, mode_bitrate; + s64 rate_fp = 0; + + panel = container_of(dp_panel, struct dp_panel_private, dp_panel); + + if (dp_panel->dsc_en) + min_supported_bpp = 24; bpp = min_t(u32, mode_edid_bpp, max_supported_bpp); link_info = &dp_panel->link_info; - data_rate_khz = link_info->num_lanes * link_info->rate * 8; - while (bpp > min_supported_bpp) { - if (mode_pclk_khz * bpp <= data_rate_khz) + rate_fp = drm_int2fixp(link_info->num_lanes * link_info->rate * 8); + + if (dp_panel->fec_en) + rate_fp = drm_fixp_div(rate_fp, dp_panel->fec_overhead_fp); + + link_bitrate = drm_fixp2int(rate_fp); + + for (; bpp > min_supported_bpp; bpp -= 6) { + if (dp_panel->dsc_en) { + if (bpp == 30 && !(dp_panel->sink_dsc_caps.color_depth & DP_DSC_10_BPC)) + continue; + else if (bpp == 24 && !(dp_panel->sink_dsc_caps.color_depth & DP_DSC_8_BPC)) + continue; + + mode_bitrate = mode_pclk_khz * DSC_TGT_BPP; + } else { + mode_bitrate = mode_pclk_khz * bpp; + } + + if (mode_bitrate <= link_bitrate) break; - bpp -= 6; } + if (bpp < min_supported_bpp) + DRM_ERROR("bpp %d is below minimum supported bpp %d\n", bpp, + min_supported_bpp); + + if (dp_panel->dsc_en && bpp != 24 && bpp != 30 && bpp != 36) + DRM_ERROR("bpp %d is not supported when dsc is enabled\n", bpp); + return bpp; }
When FEC enabled, it introduces 2.5% overhead into link capacity. This factor have to be considered into calculation supported bpp. Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> --- drivers/gpu/drm/msm/dp/dp_panel.c | 45 +++++++++++++++++++++++++++++++++------ 1 file changed, 38 insertions(+), 7 deletions(-)