drm/amd/display: Support DRR granularity

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

[Why&How]
Support DRR granularity for coasting Vtotal calculation

Reviewed-by: Robin Chen <robin.chen@amd.com>
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Weiguang Li <wei-guang.li@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

authored by

Weiguang Li and committed by

Alex Deucher 6 months ago 2f912935 cea573a8

3 changed files

expand all

drivers

gpu

drm

amd

display

dc_dp_types.h

link

protocols

link_dp_capability.c

include

dpcd_defs.h

drivers/gpu/drm/amd/display/dc/dc_dp_types.h

··· 1296 1296 /* Indicates the number of SST links supported by MSO (Multi-Stream Output) */ 1297 1297 uint8_t mso_cap_sst_links_supported; 1298 1298 uint8_t dp_edp_general_cap_2; 1299 + uint16_t drr_granularity; 1299 1300 }; 1300 1301 1301 1302 union dpcd_sink_ext_caps {

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c

··· 2220 2220 sizeof(link->dpcd_caps.edp_oled_emission_rate)); 2221 2221 2222 2222 /* 2223 + * Read DRR granularity 2224 + */ 2225 + core_link_read_dpcd(link, DP_SINK_DRR_GRANULARITY, 2226 + (uint8_t *)&link->dpcd_caps.drr_granularity, 2227 + sizeof(link->dpcd_caps.drr_granularity)); 2228 + 2229 + /* 2223 2230 * Read Multi-SST (Single Stream Transport) capability 2224 2231 * for eDP version 1.4 or higher. 2225 2232 */

drivers/gpu/drm/amd/display/include/dpcd_defs.h

··· 188 188 #define DP_SOURCE_BACKLIGHT_CURRENT_PEAK 0x326 189 189 #define DP_SOURCE_BACKLIGHT_CONTROL 0x32E 190 190 #define DP_SOURCE_BACKLIGHT_ENABLE 0x32F 191 + #define DP_SINK_DRR_GRANULARITY 0x33B 191 192 #define DP_SOURCE_MINIMUM_HBLANK_SUPPORTED 0x340 192 193 #define DP_SINK_PR_REPLAY_STATUS 0x378 193 194 #define DP_SINK_PR_PIXEL_DEVIATION_PER_LINE 0x379

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