drm/amd/display: linux enable oled panel support dc part

[Why] old panel has been enabled for window driver but not linux.

[How] enable oled panel support for linux. this patch is dc part.
Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -599,6 +599,9 @@ static bool detect_dp(
 
 	if (sink_caps->transaction_type == DDC_TRANSACTION_TYPE_I2C_OVER_AUX) {
 		sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT;
+
+		dpcd_set_source_specific_data(link);
+
 		if (!detect_dp_sink_caps(link))
 			return false;
 
@@ -769,8 +772,16 @@ static bool dc_link_detect_helper(struct dc_link *link,
 
 	if ((link->connector_signal == SIGNAL_TYPE_LVDS ||
 			link->connector_signal == SIGNAL_TYPE_EDP) &&
-			link->local_sink)
+			link->local_sink) {
+
+		// need to re-write OUI and brightness in resume case
+		if (link->connector_signal == SIGNAL_TYPE_EDP) {
+			dpcd_set_source_specific_data(link);
+			dc_link_set_default_brightness_aux(link); //TODO: use cached
+		}
+
 		return true;
+	}
 
 	if (false == dc_link_detect_sink(link, &new_connection_type)) {
 		BREAK_TO_DEBUGGER();
@@ -818,6 +829,10 @@ static bool dc_link_detect_helper(struct dc_link *link,
 		}
 
 		case SIGNAL_TYPE_EDP: {
+			read_current_link_settings_on_detect(link);
+
+			dpcd_set_source_specific_data(link);
+
 			detect_edp_sink_caps(link);
 			read_current_link_settings_on_detect(link);
 			sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
@@ -1492,6 +1507,7 @@ static enum dc_status enable_link_dp(
 	bool fec_enable;
 	int i;
 	bool apply_seamless_boot_optimization = false;
+	uint32_t bl_oled_enable_delay = 50; // in ms
 
 	// check for seamless boot
 	for (i = 0; i < state->stream_count; i++) {
@@ -1515,6 +1531,9 @@ static enum dc_status enable_link_dp(
 	if (state->clk_mgr && !apply_seamless_boot_optimization)
 		state->clk_mgr->funcs->update_clocks(state->clk_mgr, state, false);
 
+	// during mode switch we do DP_SET_POWER off then on, and OUI is lost
+	dpcd_set_source_specific_data(link);
+
 	skip_video_pattern = true;
 
 	if (link_settings.link_rate == LINK_RATE_LOW)
@@ -1538,6 +1557,17 @@ static enum dc_status enable_link_dp(
 		fec_enable = true;
 
 	dp_set_fec_enable(link, fec_enable);
+
+	// during mode set we do DP_SET_POWER off then on, aux writes are lost
+	if (link->dpcd_sink_ext_caps.bits.oled == 1 ||
+		link->dpcd_sink_ext_caps.bits.sdr_aux_backlight_control == 1 ||
+		link->dpcd_sink_ext_caps.bits.hdr_aux_backlight_control == 1) {
+		dc_link_set_default_brightness_aux(link); // TODO: use cached if known
+		if (link->dpcd_sink_ext_caps.bits.oled == 1)
+			msleep(bl_oled_enable_delay);
+		dc_link_backlight_enable_aux(link, true);
+	}
+
 	return status;
 }
 

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

@@ -20,6 +20,14 @@
 
 #define DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE   0x50
 
+#define DP_SOURCE_TABLE_REVISION	    0x310
+#define DP_SOURCE_PAYLOAD_SIZE		    0x311
+#define DP_SOURCE_SINK_CAP		    0x317
+#define DP_SOURCE_BACKLIGHT_LEVEL	    0x320
+#define DP_SOURCE_BACKLIGHT_CURRENT_PEAK    0x326
+#define DP_SOURCE_BACKLIGHT_CONTROL	    0x32E
+#define DP_SOURCE_BACKLIGHT_ENABLE	    0x32F
+
 /* maximum pre emphasis level allowed for each voltage swing level*/
 static const enum dc_pre_emphasis voltage_swing_to_pre_emphasis[] = {
 		PRE_EMPHASIS_LEVEL3,
@@ -3166,6 +3174,23 @@ static void dp_wa_power_up_0010FA(struct dc_link *link, uint8_t *dpcd_data,
 		link->wa_flags.dp_keep_receiver_powered = false;
 }
 
+/* Read additional sink caps defined in source specific DPCD area
+ * This function currently only reads from SinkCapability address (DP_SOURCE_SINK_CAP)
+ */
+static bool dpcd_read_sink_ext_caps(struct dc_link *link)
+{
+	uint8_t dpcd_data;
+
+	if (!link)
+		return false;
+
+	if (core_link_read_dpcd(link, DP_SOURCE_SINK_CAP, &dpcd_data, 1) != DC_OK)
+		return false;
+
+	link->dpcd_sink_ext_caps.raw = dpcd_data;
+	return true;
+}
+
 static bool retrieve_link_cap(struct dc_link *link)
 {
 	/* DP_ADAPTER_CAP - DP_DPCD_REV + 1 == 16 and also DP_DSC_BITS_PER_PIXEL_INC - DP_DSC_SUPPORT + 1 == 16,
@@ -3438,6 +3463,9 @@ static bool retrieve_link_cap(struct dc_link *link)
 				sizeof(link->dpcd_caps.dsc_caps.dsc_ext_caps.raw));
 	}
 
+	if (!dpcd_read_sink_ext_caps(link))
+		link->dpcd_sink_ext_caps.raw = 0;
+
 	/* Connectivity log: detection */
 	CONN_DATA_DETECT(link, dpcd_data, sizeof(dpcd_data), "Rx Caps: ");
 
@@ -3590,6 +3618,8 @@ void detect_edp_sink_caps(struct dc_link *link)
 		}
 	}
 	link->verified_link_cap = link->reported_link_cap;
+
+	dc_link_set_default_brightness_aux(link);
 }
 
 void dc_link_dp_enable_hpd(const struct dc_link *link)
@@ -4147,3 +4177,141 @@ void dp_set_fec_enable(struct dc_link *link, bool enable)
 	}
 }
 
+void dpcd_set_source_specific_data(struct dc_link *link)
+{
+	struct dpcd_amd_signature amd_signature;
+	const uint32_t post_oui_delay = 30; // 30ms
+
+	amd_signature.AMD_IEEE_TxSignature_byte1 = 0x0;
+	amd_signature.AMD_IEEE_TxSignature_byte2 = 0x0;
+	amd_signature.AMD_IEEE_TxSignature_byte3 = 0x1A;
+	amd_signature.device_id_byte1 =
+			(uint8_t)(link->ctx->asic_id.chip_id);
+	amd_signature.device_id_byte2 =
+			(uint8_t)(link->ctx->asic_id.chip_id >> 8);
+	memset(&amd_signature.zero, 0, 4);
+	amd_signature.dce_version =
+			(uint8_t)(link->ctx->dce_version);
+	amd_signature.dal_version_byte1 = 0x0; // needed? where to get?
+	amd_signature.dal_version_byte2 = 0x0; // needed? where to get?
+
+	core_link_write_dpcd(link, DP_SOURCE_OUI,
+			(uint8_t *)(&amd_signature),
+			sizeof(amd_signature));
+
+	// Sink may need to configure internals based on vendor, so allow some
+	// time before proceeding with possibly vendor specific transactions
+	msleep(post_oui_delay);
+}
+
+bool dc_link_set_backlight_level_nits(struct dc_link *link,
+		bool isHDR,
+		uint32_t backlight_millinits,
+		uint32_t transition_time_in_ms)
+{
+	struct dpcd_source_backlight_set dpcd_backlight_set;
+	uint8_t backlight_control = isHDR ? 1 : 0;
+
+	if (!link || (link->connector_signal != SIGNAL_TYPE_EDP &&
+			link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT))
+		return false;
+
+	// OLEDs have no PWM, they can only use AUX
+	if (link->dpcd_sink_ext_caps.bits.oled == 1)
+		backlight_control = 1;
+
+	*(uint32_t *)&dpcd_backlight_set.backlight_level_millinits = backlight_millinits;
+	*(uint16_t *)&dpcd_backlight_set.backlight_transition_time_ms = (uint16_t)transition_time_in_ms;
+
+
+	if (core_link_write_dpcd(link, DP_SOURCE_BACKLIGHT_LEVEL,
+			(uint8_t *)(&dpcd_backlight_set),
+			sizeof(dpcd_backlight_set)) != DC_OK)
+		return false;
+
+	if (core_link_write_dpcd(link, DP_SOURCE_BACKLIGHT_CONTROL,
+			&backlight_control, 1) != DC_OK)
+		return false;
+
+	return true;
+}
+
+bool dc_link_get_backlight_level_nits(struct dc_link *link,
+		uint32_t *backlight_millinits_avg,
+		uint32_t *backlight_millinits_peak)
+{
+	union dpcd_source_backlight_get dpcd_backlight_get;
+
+	memset(&dpcd_backlight_get, 0, sizeof(union dpcd_source_backlight_get));
+
+	if (!link || (link->connector_signal != SIGNAL_TYPE_EDP &&
+			link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT))
+		return false;
+
+	if (!core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_CURRENT_PEAK,
+			dpcd_backlight_get.raw,
+			sizeof(union dpcd_source_backlight_get)))
+		return false;
+
+	*backlight_millinits_avg =
+		dpcd_backlight_get.bytes.backlight_millinits_avg;
+	*backlight_millinits_peak =
+		dpcd_backlight_get.bytes.backlight_millinits_peak;
+
+	/* On non-supported panels dpcd_read usually succeeds with 0 returned */
+	if (*backlight_millinits_avg == 0 ||
+			*backlight_millinits_avg > *backlight_millinits_peak)
+		return false;
+
+	return true;
+}
+
+bool dc_link_backlight_enable_aux(struct dc_link *link, bool enable)
+{
+	uint8_t backlight_enable = enable ? 1 : 0;
+
+	if (!link || (link->connector_signal != SIGNAL_TYPE_EDP &&
+		link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT))
+		return false;
+
+	if (core_link_write_dpcd(link, DP_SOURCE_BACKLIGHT_ENABLE,
+		&backlight_enable, 1) != DC_OK)
+		return false;
+
+	return true;
+}
+
+// we read default from 0x320 because we expect BIOS wrote it there
+// regular get_backlight_nit reads from panel set at 0x326
+bool dc_link_read_default_bl_aux(struct dc_link *link, uint32_t *backlight_millinits)
+{
+	if (!link || (link->connector_signal != SIGNAL_TYPE_EDP &&
+		link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT))
+		return false;
+
+	if (!core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_LEVEL,
+		(uint8_t *) backlight_millinits,
+		sizeof(uint32_t)))
+		return false;
+
+	return true;
+}
+
+bool dc_link_set_default_brightness_aux(struct dc_link *link)
+{
+	uint32_t default_backlight;
+
+	if (link &&
+		(link->dpcd_sink_ext_caps.bits.hdr_aux_backlight_control == 1 ||
+		link->dpcd_sink_ext_caps.bits.sdr_aux_backlight_control == 1)) {
+		if (!dc_link_read_default_bl_aux(link, &default_backlight))
+			default_backlight = 150000;
+		// if < 5 nits or > 5000, it might be wrong readback
+		if (default_backlight < 5000 || default_backlight > 5000000)
+			default_backlight = 150000; //
+
+		return dc_link_set_backlight_level_nits(link, true,
+				default_backlight, 0);
+	}
+	return false;
+}

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

@@ -980,6 +980,20 @@ struct dpcd_caps {
 
 };
 
+union dpcd_sink_ext_caps {
+	struct {
+		/* 0 - Sink supports backlight adjust via PWM during SDR/HDR mode
+		 * 1 - Sink supports backlight adjust via AUX during SDR/HDR mode.
+		 */
+		uint8_t sdr_aux_backlight_control : 1;
+		uint8_t hdr_aux_backlight_control : 1;
+		uint8_t reserved_1 : 2;
+		uint8_t oled : 1;
+		uint8_t reserved : 3;
+	} bits;
+	uint8_t raw;
+};
+
 #include "dc_link.h"
 
 /*******************************************************************************

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

@@ -432,6 +432,40 @@ struct dp_sink_hw_fw_revision {
 	uint8_t ieee_fw_rev[2];
 };
 
+struct dpcd_amd_signature {
+	uint8_t AMD_IEEE_TxSignature_byte1;
+	uint8_t AMD_IEEE_TxSignature_byte2;
+	uint8_t AMD_IEEE_TxSignature_byte3;
+	uint8_t device_id_byte1;
+	uint8_t device_id_byte2;
+	uint8_t zero[4];
+	uint8_t dce_version;
+	uint8_t dal_version_byte1;
+	uint8_t dal_version_byte2;
+};
+
+struct dpcd_source_backlight_set {
+	struct  {
+		uint8_t byte0;
+		uint8_t byte1;
+		uint8_t byte2;
+		uint8_t byte3;
+	} backlight_level_millinits;
+
+	struct  {
+		uint8_t byte0;
+		uint8_t byte1;
+	} backlight_transition_time_ms;
+};
+
+union dpcd_source_backlight_get {
+	struct {
+		uint32_t backlight_millinits_peak; /* 326h */
+		uint32_t backlight_millinits_avg; /* 32Ah */
+	} bytes;
+	uint8_t raw[8];
+};
+
 /*DPCD register of DP receiver capability field bits-*/
 union edp_configuration_cap {
 	struct {

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

@@ -128,6 +128,7 @@ struct dc_link {
 	enum edp_revision edp_revision;
 	bool psr_feature_enabled;
 	bool psr_allow_active;
+	union dpcd_sink_ext_caps dpcd_sink_ext_caps;
 
 	/* MST record stream using this link */
 	struct link_flags {
@@ -178,6 +179,21 @@ bool dc_link_set_backlight_level(const struct dc_link *dc_link,
 		uint32_t backlight_pwm_u16_16,
 		uint32_t frame_ramp);
 
+/* Set/get nits-based backlight level of an embedded panel (eDP, LVDS). */
+bool dc_link_set_backlight_level_nits(struct dc_link *link,
+		bool isHDR,
+		uint32_t backlight_millinits,
+		uint32_t transition_time_in_ms);
+
+bool dc_link_get_backlight_level_nits(struct dc_link *link,
+		uint32_t *backlight_millinits,
+		uint32_t *backlight_millinits_peak);
+
+bool dc_link_backlight_enable_aux(struct dc_link *link, bool enable);
+
+bool dc_link_read_default_bl_aux(struct dc_link *link, uint32_t *backlight_millinits);
+bool dc_link_set_default_brightness_aux(struct dc_link *link);
+
 int dc_link_get_backlight_level(const struct dc_link *dc_link);
 
 bool dc_link_set_abm_disable(const struct dc_link *dc_link);

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -71,6 +71,8 @@
 #define PANEL_POWER_UP_TIMEOUT 300
 #define PANEL_POWER_DOWN_TIMEOUT 500
 #define HPD_CHECK_INTERVAL 10
+#define OLED_POST_T7_DELAY 100
+#define OLED_PRE_T11_DELAY 150
 
 #define CTX \
 	hws->ctx
@@ -936,9 +938,21 @@ void dce110_edp_backlight_control(
 	if (cntl.action == TRANSMITTER_CONTROL_BACKLIGHT_ON)
 		edp_receiver_ready_T7(link);
 	link_transmitter_control(ctx->dc_bios, &cntl);
+
+	if (enable && link->dpcd_sink_ext_caps.bits.oled)
+		msleep(OLED_POST_T7_DELAY);
+
+	if (link->dpcd_sink_ext_caps.bits.oled ||
+		link->dpcd_sink_ext_caps.bits.hdr_aux_backlight_control == 1 ||
+		link->dpcd_sink_ext_caps.bits.sdr_aux_backlight_control == 1)
+		dc_link_backlight_enable_aux(link, enable);
+
 	/*edp 1.2*/
 	if (cntl.action == TRANSMITTER_CONTROL_BACKLIGHT_OFF)
 		edp_receiver_ready_T9(link);
+
+	if (!enable && link->dpcd_sink_ext_caps.bits.oled)
+		msleep(OLED_PRE_T11_DELAY);
 }
 
 void dce110_enable_audio_stream(struct pipe_ctx *pipe_ctx)

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

@@ -78,6 +78,8 @@ void dp_set_panel_mode(struct dc_link *link, enum dp_panel_mode panel_mode);
 
 bool dp_overwrite_extended_receiver_cap(struct dc_link *link);
 
+void dpcd_set_source_specific_data(struct dc_link *link);
+
 void dp_set_fec_ready(struct dc_link *link, bool ready);
 void dp_set_fec_enable(struct dc_link *link, bool enable);
 bool dp_set_dsc_enable(struct pipe_ctx *pipe_ctx, bool enable);