drm/amd/display: Rearchitecture HDMI HPD

- Disabled HPD filter and used HPD software timer instead
- Allows DM to disable HPD filtering

Signed-off-by: John Barberiz <jbarberi@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -127,6 +127,8 @@ static bool program_hpd_filter(
 	int delay_on_connect_in_ms = 0;
 	int delay_on_disconnect_in_ms = 0;
 
+	if (link->is_hpd_filter_disabled)
+		return false;
 	/* Verify feature is supported */
 	switch (link->connector_signal) {
 	case SIGNAL_TYPE_DVI_SINGLE_LINK:
@@ -2346,3 +2348,33 @@ void core_link_set_avmute(struct pipe_ctx *pipe_ctx, bool enable)
 	core_dc->hwss.set_avmute(pipe_ctx, enable);
 }
 
+void dc_link_disable_hpd_filter(struct dc_link *link)
+{
+	struct gpio *hpd;
+
+	if (!link->is_hpd_filter_disabled) {
+		link->is_hpd_filter_disabled = true;
+		/* Obtain HPD handle */
+		hpd = get_hpd_gpio(link->ctx->dc_bios, link->link_id, link->ctx->gpio_service);
+
+		if (!hpd)
+			return;
+
+		/* Setup HPD filtering */
+		if (dal_gpio_open(hpd, GPIO_MODE_INTERRUPT) == GPIO_RESULT_OK) {
+			struct gpio_hpd_config config;
+
+			config.delay_on_connect = 0;
+			config.delay_on_disconnect = 0;
+
+			dal_irq_setup_hpd_filter(hpd, &config);
+
+			dal_gpio_close(hpd);
+		} else {
+			ASSERT_CRITICAL(false);
+		}
+		/* Release HPD handle */
+		dal_gpio_destroy_irq(&hpd);
+	}
+}
+

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

@@ -64,6 +64,8 @@ struct dc_link {
 	enum signal_type connector_signal;
 	enum dc_irq_source irq_source_hpd;
 	enum dc_irq_source irq_source_hpd_rx;/* aka DP Short Pulse  */
+	bool is_hpd_filter_disabled;
+
 	/* caps is the same as reported_link_cap. link_traing use
 	 * reported_link_cap. Will clean up.  TODO
 	 */
@@ -195,6 +197,8 @@ bool dc_link_dp_set_test_pattern(
 	const unsigned char *p_custom_pattern,
 	unsigned int cust_pattern_size);
 
+void dc_link_disable_hpd_filter(struct dc_link *link);
+
 /*
  * DPCD access interfaces
  */