From: Charlene Liu <Charlene.Liu@xxxxxxx>
[why]
usb3->usb2 switch system hang.
driver needs to limit the max sink cap based on DP4 mode.
[how]
based on s_dpalt check and DP4 check:
limit the USB-C DPALT DP maximum supported lane count.
Signed-off-by: Charlene Liu <Charlene.Liu@xxxxxxx>
Reviewed-by: Chris Park <Chris.Park@xxxxxxx>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
---
.../amd/display/dc/dcn20/dcn20_link_encoder.c | 24 +++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_link_encoder.c
index e4ac73035c84..15d513b79667 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_link_encoder.c
@@ -311,6 +311,28 @@ void enc2_hw_init(struct link_encoder *enc)
dcn10_aux_initialize(enc10);
}
+void dcn20_link_encoder_get_max_link_cap(struct link_encoder *enc,
+ struct dc_link_settings *link_settings)
+{
+ struct dcn10_link_encoder *enc10 = TO_DCN10_LINK_ENC(enc);
+ uint32_t value;
+
+ REG_GET(RDPCSTX_PHY_CNTL6, RDPCS_PHY_DPALT_DP4, &value);
+
+ if (!value && link_settings->lane_count > LANE_COUNT_TWO)
+ link_settings->lane_count = LANE_COUNT_TWO;
+}
+bool dcn20_link_encoder_is_in_alt_mode(struct link_encoder *enc)
+{
+ struct dcn10_link_encoder *enc10 = TO_DCN10_LINK_ENC(enc);
+ uint32_t value;
+
+ REG_GET(RDPCSTX_PHY_CNTL6, RDPCS_PHY_DPALT_DISABLE, &value);
+
+ // if value == 1 alt mode is disabled, otherwise it is enabled
+ return !value;
+}
+
static const struct link_encoder_funcs dcn20_link_enc_funcs = {
.read_state = link_enc2_read_state,
.validate_output_with_stream =
@@ -338,6 +360,8 @@ static const struct link_encoder_funcs dcn20_link_enc_funcs = {
.fec_is_active = enc2_fec_is_active,
.get_dig_mode = dcn10_get_dig_mode,
.get_dig_frontend = dcn10_get_dig_frontend,
+ .is_in_alt_mode = dcn20_link_encoder_is_in_alt_mode,
+ .get_max_link_cap = dcn20_link_encoder_get_max_link_cap,
};
void dcn20_link_encoder_construct(
--
2.26.0
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