drm/amd/display: Modify the hdcp device count check condition

[why]
Some MST display may not report the internal panel to DEVICE_COUNT,
that makes the check condition always failed.

[how]
To update this condition with the reported device count + 1
(because the immediate repeater's internal panel is possibly
not included in DEVICE_COUNT)
Signed-off-by: Martin Tsai <martin.tsai@amd.com>
Acked-by: Bindu Ramamurthy <bindu.r@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c

@@ -128,8 +128,12 @@ static inline uint8_t get_device_count(struct mod_hdcp *hdcp)
 
 static inline enum mod_hdcp_status check_device_count(struct mod_hdcp *hdcp)
 {
-	/* device count must be greater than or equal to tracked hdcp displays */
-	return (get_device_count(hdcp) < get_active_display_count(hdcp)) ?
+	/* Some MST display may choose to report the internal panel as an HDCP RX.
+	 * To update this condition with 1(because the immediate repeater's internal
+	 * panel is possibly not included in DEVICE_COUNT) + get_device_count(hdcp).
+	 * Device count must be greater than or equal to tracked hdcp displays.
+	 */
+	return ((1 + get_device_count(hdcp)) < get_active_display_count(hdcp)) ?
 			MOD_HDCP_STATUS_HDCP1_DEVICE_COUNT_MISMATCH_FAILURE :
 			MOD_HDCP_STATUS_SUCCESS;
 }

drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_execution.c

@@ -207,8 +207,11 @@ static inline uint8_t get_device_count(struct mod_hdcp *hdcp)
 
 static enum mod_hdcp_status check_device_count(struct mod_hdcp *hdcp)
 {
-	/* device count must be greater than or equal to tracked hdcp displays */
-	return (get_device_count(hdcp) < get_active_display_count(hdcp)) ?
+	/* Some MST display may choose to report the internal panel as an HDCP RX.   */
+	/* To update this condition with 1(because the immediate repeater's internal */
+	/* panel is possibly not included in DEVICE_COUNT) + get_device_count(hdcp). */
+	/* Device count must be greater than or equal to tracked hdcp displays.      */
+	return ((1 + get_device_count(hdcp)) < get_active_display_count(hdcp)) ?
 			MOD_HDCP_STATUS_HDCP2_DEVICE_COUNT_MISMATCH_FAILURE :
 			MOD_HDCP_STATUS_SUCCESS;
 }