drm/amd/display: Add configuration options for AUX wake work around.

[Why]
Work around to try to wake unresponsive DP sinks may need to be adjusted
for certain sinks.

[How]
Add options to disable work around or adjust time spent trying to wake
unresponsive DPRX.

Tested-by: Daniel Wheeler <[e-mail]>
Reviewed-by: Martin Leung <[e-mail]>
Acked-by: Tom Chung <[e-mail]>
Signed-off-by: Jimmy Kizito <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

···
 			LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD);
 
 	/* Try to ensure AUX channel active before proceeding. */
-	status = wa_try_to_wake_dprx(link, LINK_AUX_WAKE_TIMEOUT_MS);
+	if (link->dc->debug.aux_wake_wa.bits.enable_wa) {
+		uint64_t timeout_ms = link->dc->debug.aux_wake_wa.bits.timeout_ms;
+
+		if (link->dc->debug.aux_wake_wa.bits.use_default_timeout)
+			timeout_ms = LINK_AUX_WAKE_TIMEOUT_MS;
+		status = wa_try_to_wake_dprx(link, timeout_ms);
+	}
 
 	is_lttpr_present = dp_retrieve_lttpr_cap(link);
 	/* Read DP tunneling information. */

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

···
 	uint32_t raw;
 };
 
+/* AUX wake work around options
+ * 0: enable/disable work around
+ * 1: use default timeout LINK_AUX_WAKE_TIMEOUT_MS
+ * 15-2: reserved
+ * 31-16: timeout in ms
+ */
+union aux_wake_wa_options {
+	struct {
+		uint32_t enable_wa : 1;
+		uint32_t use_default_timeout : 1;
+		uint32_t rsvd: 14;
+		uint32_t timeout_ms : 16;
+	} bits;
+	uint32_t raw;
+};
+
 struct dc_debug_data {
 	uint32_t ltFailCount;
 	uint32_t i2cErrorCount;
···
 #endif
 	bool apply_vendor_specific_lttpr_wa;
 	bool extended_blank_optimization;
+	union aux_wake_wa_options aux_wake_wa;
 	bool ignore_dpref_ss;
 	uint8_t psr_power_use_phy_fsm;
 };