[PATCH AUTOSEL 6.14 387/642] drm/amd/display: Read LTTPR ALPM caps during link cap retrieval

[Sasha Levin]

From: George Shen <george.shen at 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 at amd.com>
Signed-off-by: George Shen <george.shen at amd.com>
Signed-off-by: Roman Li <roman.li at amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Sasha Levin <sashal at 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) &&
-- 
2.39.5