drm/amd/display: Fix CP_IRQ clear bit and logic

[Why]
Currently clearing the wrong bit for CP_IRQ, and logic on when to
clear needs to be fixed.

[How]
Corrected bit to clear and improved logic for decision to clear.
Signed-off-by: Harmanprit Tatla <harmanprit.tatla@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c

@@ -472,8 +472,7 @@ enum mod_hdcp_status mod_hdcp_process_event(struct mod_hdcp *hdcp,
 	}
 
 	/* Clear CP_IRQ status if needed */
-	if (event_ctx.event == MOD_HDCP_EVENT_CPIRQ &&
-			event_ctx.unexpected_event == 0) {
+	if (event_ctx.event == MOD_HDCP_EVENT_CPIRQ) {
 		status = mod_hdcp_clear_cp_irq_status(hdcp);
 		if (status != MOD_HDCP_STATUS_SUCCESS)
 			push_error_status(hdcp, status);

drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c

@@ -30,6 +30,8 @@
 #define KSV_READ_SIZE 0xf	/* 0x6803b - 0x6802c */
 #define HDCP_MAX_AUX_TRANSACTION_SIZE 16
 
+#define DP_CP_IRQ (1 << 2)
+
 enum mod_hdcp_ddc_message_id {
 	MOD_HDCP_MESSAGE_ID_INVALID = -1,
 
@@ -648,18 +650,14 @@ enum mod_hdcp_status mod_hdcp_write_content_type(struct mod_hdcp *hdcp)
 
 enum mod_hdcp_status mod_hdcp_clear_cp_irq_status(struct mod_hdcp *hdcp)
 {
-	uint8_t clear_cp_irq_bit = 2;
+	uint8_t clear_cp_irq_bit = DP_CP_IRQ;
 	uint32_t size = 1;
 
 	if (is_dp_hdcp(hdcp)) {
-		if (hdcp->connection.link.dp.rev >= 0x14)
-			return hdcp->config.ddc.funcs.write_dpcd(hdcp->config.ddc.handle,
-					DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0, &clear_cp_irq_bit, size)
-					? MOD_HDCP_STATUS_SUCCESS : MOD_HDCP_STATUS_DDC_FAILURE;
-		else
-			return hdcp->config.ddc.funcs.write_dpcd(hdcp->config.ddc.handle,
-					DP_DEVICE_SERVICE_IRQ_VECTOR, &clear_cp_irq_bit, size)
-					? MOD_HDCP_STATUS_SUCCESS : MOD_HDCP_STATUS_DDC_FAILURE;
+		uint32_t cp_irq_addrs = (hdcp->connection.link.dp.rev >= 0x14)
+				? DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0:DP_DEVICE_SERVICE_IRQ_VECTOR;
+		return hdcp->config.ddc.funcs.write_dpcd(hdcp->config.ddc.handle, cp_irq_addrs,
+				&clear_cp_irq_bit, size) ? MOD_HDCP_STATUS_SUCCESS : MOD_HDCP_STATUS_DDC_FAILURE;
 	}
 
 	return MOD_HDCP_STATUS_INVALID_OPERATION;