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>

diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c
index f244b72..73ca49f 100644 (file)
--- a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c
+++ b/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;
 }

diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_execution.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_execution.c
index 549c113..a0895a7 100644 (file)
--- a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_execution.c
+++ b/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;
 }