From: George Shen george.shen@amd.com
[ Upstream commit de84d580126eb2214937df755cfec5ef0901479e ]
[Why] The latest DP spec requires the DP TX to read DPCD F0000h through F0009h when detecting LTTPR capabilities for the first time.
[How] Update LTTPR cap retrieval to read up to F0009h (two more bytes than the previous F0007h), and store the LTTPR ALPM capabilities.
Reviewed-by: Wenjing Liu wenjing.liu@amd.com Signed-off-by: George Shen george.shen@amd.com Signed-off-by: Roman Li roman.li@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/dc/dc_dp_types.h | 12 ++++++++++++ .../display/dc/link/protocols/link_dp_capability.c | 6 +++++- 2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h index cc005da75ce4c..8bb628ab78554 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h @@ -959,6 +959,14 @@ union dp_128b_132b_supported_lttpr_link_rates { uint8_t raw; };
+union dp_alpm_lttpr_cap { + struct { + uint8_t AUX_LESS_ALPM_SUPPORTED :1; + uint8_t RESERVED :7; + } bits; + uint8_t raw; +}; + union dp_sink_video_fallback_formats { struct { uint8_t dp_1024x768_60Hz_24bpp_support :1; @@ -1118,6 +1126,7 @@ struct dc_lttpr_caps { uint8_t max_ext_timeout; union dp_main_link_channel_coding_lttpr_cap main_link_channel_coding; union dp_128b_132b_supported_lttpr_link_rates supported_128b_132b_rates; + union dp_alpm_lttpr_cap alpm; uint8_t aux_rd_interval[MAX_REPEATER_CNT - 1]; uint8_t lttpr_ieee_oui[3]; uint8_t lttpr_device_id[6]; @@ -1372,6 +1381,9 @@ struct dp_trace { #ifndef DPCD_MAX_UNCOMPRESSED_PIXEL_RATE_CAP #define DPCD_MAX_UNCOMPRESSED_PIXEL_RATE_CAP 0x221c #endif +#ifndef DP_LTTPR_ALPM_CAPABILITIES +#define DP_LTTPR_ALPM_CAPABILITIES 0xF0009 +#endif #ifndef DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE #define DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE 0x50 #endif diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c index 28843e9882d39..64e4ae379e346 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c @@ -1502,7 +1502,7 @@ static bool dpcd_read_sink_ext_caps(struct dc_link *link)
enum dc_status dp_retrieve_lttpr_cap(struct dc_link *link) { - uint8_t lttpr_dpcd_data[8] = {0}; + uint8_t lttpr_dpcd_data[10] = {0}; enum dc_status status; bool is_lttpr_present;
@@ -1552,6 +1552,10 @@ enum dc_status dp_retrieve_lttpr_cap(struct dc_link *link) lttpr_dpcd_data[DP_PHY_REPEATER_128B132B_RATES - DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
+ link->dpcd_caps.lttpr_caps.alpm.raw = + lttpr_dpcd_data[DP_LTTPR_ALPM_CAPABILITIES - + DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV]; + /* If this chip cap is set, at least one retimer must exist in the chain * Override count to 1 if we receive a known bad count (0 or an invalid value) */ if (((link->chip_caps & AMD_EXT_DISPLAY_PATH_CAPS__EXT_CHIP_MASK) == AMD_EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN) &&