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drm/amd/display: avoid to authentication when DEVICE_COUNT=0

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[why]
we don't support authentication with DEVICE_COUNT=0

[how]
check value DEVICE_COUNT before doing authentication

Signed-off-by: Yu-ting Shen <Yu-ting.Shen@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Wayne Lin <waynelin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Yu-ting Shen 2021-04-14 15:33:33 +08:00 • committed by Alex Deucher
parent 642d3a2bf2
commit 088bebc79e
2 changed files with 10 additions and 0 deletions
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5
drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c
View file

@ -128,6 +128,11 @@ static inline uint8_t get_device_count(struct mod_hdcp *hdcp)
static inline enum mod_hdcp_status check_device_count(struct mod_hdcp *hdcp)
{
/* Avoid device count == 0 to do authentication */
if (0 == get_device_count(hdcp)) {
return MOD_HDCP_STATUS_HDCP1_DEVICE_COUNT_MISMATCH_FAILURE;
}
/* 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).

5
drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_execution.c
View file

@ -207,6 +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)
{
/* Avoid device count == 0 to do authentication */
if (0 == get_device_count(hdcp)) {
return MOD_HDCP_STATUS_HDCP1_DEVICE_COUNT_MISMATCH_FAILURE;
}
/* 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). */