drm/amd/display: Restore rptr/wptr for DMCUB as workaround

[ Upstream commit 8f3589bb6fcea397775398cba4fbcc46829a60ed ]

[Why]
States may be desync after resume.

[How]
Sync sw state with hw state.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: JinZe.Xu <JinZe.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: 1ffa8602e39b ("drm/amd/display: Guard against invalid RPTR/WPTR being set")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/dmub/dmub_srv.h b/drivers/gpu/drm/amd/display/dmub/dmub_srv.h
index a21fe7b..aaabaab 100644 (file)
--- a/drivers/gpu/drm/amd/display/dmub/dmub_srv.h
+++ b/drivers/gpu/drm/amd/display/dmub/dmub_srv.h
@@ -332,6 +332,8 @@ struct dmub_srv_hw_funcs {
        void (*setup_mailbox)(struct dmub_srv *dmub,
                              const struct dmub_region *inbox1);
 
+       uint32_t (*get_inbox1_wptr)(struct dmub_srv *dmub);
+
        uint32_t (*get_inbox1_rptr)(struct dmub_srv *dmub);
 
        void (*set_inbox1_wptr)(struct dmub_srv *dmub, uint32_t wptr_offset);
@@ -591,6 +593,18 @@ enum dmub_status dmub_srv_hw_init(struct dmub_srv *dmub,
 enum dmub_status dmub_srv_hw_reset(struct dmub_srv *dmub);
 
 /**
+ * dmub_srv_sync_inbox1() - sync sw state with hw state
+ * @dmub: the dmub service
+ *
+ * Sync sw state with hw state when resume from S0i3
+ *
+ * Return:
+ *   DMUB_STATUS_OK - success
+ *   DMUB_STATUS_INVALID - unspecified error
+ */
+enum dmub_status dmub_srv_sync_inbox1(struct dmub_srv *dmub);
+
+/**
  * dmub_srv_cmd_queue() - queues a command to the DMUB
  * @dmub: the dmub service
  * @cmd: the command to queue

diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.c
index a6540e2..98dad0d 100644 (file)
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.c
@@ -282,6 +282,11 @@ void dmub_dcn20_setup_mailbox(struct dmub_srv *dmub,
        REG_WRITE(DMCUB_INBOX1_SIZE, inbox1->top - inbox1->base);
 }
 
+uint32_t dmub_dcn20_get_inbox1_wptr(struct dmub_srv *dmub)
+{
+       return REG_READ(DMCUB_INBOX1_WPTR);
+}
+
 uint32_t dmub_dcn20_get_inbox1_rptr(struct dmub_srv *dmub)
 {
        return REG_READ(DMCUB_INBOX1_RPTR);

diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.h b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.h
index c2e5831..1df128e 100644 (file)
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.h
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn20.h
@@ -202,6 +202,8 @@ void dmub_dcn20_setup_windows(struct dmub_srv *dmub,
 void dmub_dcn20_setup_mailbox(struct dmub_srv *dmub,
                              const struct dmub_region *inbox1);
 
+uint32_t dmub_dcn20_get_inbox1_wptr(struct dmub_srv *dmub);
+
 uint32_t dmub_dcn20_get_inbox1_rptr(struct dmub_srv *dmub);
 
 void dmub_dcn20_set_inbox1_wptr(struct dmub_srv *dmub, uint32_t wptr_offset);

diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c
index 89d24fb..5e95254 100644 (file)
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c
@@ -242,6 +242,11 @@ void dmub_dcn31_setup_mailbox(struct dmub_srv *dmub,
        REG_WRITE(DMCUB_INBOX1_SIZE, inbox1->top - inbox1->base);
 }
 
+uint32_t dmub_dcn31_get_inbox1_wptr(struct dmub_srv *dmub)
+{
+       return REG_READ(DMCUB_INBOX1_WPTR);
+}
+
 uint32_t dmub_dcn31_get_inbox1_rptr(struct dmub_srv *dmub)
 {
        return REG_READ(DMCUB_INBOX1_RPTR);

diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.h b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.h
index eb62410..89c5a94 100644 (file)
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.h
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.h
@@ -204,6 +204,8 @@ void dmub_dcn31_setup_windows(struct dmub_srv *dmub,
 void dmub_dcn31_setup_mailbox(struct dmub_srv *dmub,
                              const struct dmub_region *inbox1);
 
+uint32_t dmub_dcn31_get_inbox1_wptr(struct dmub_srv *dmub);
+
 uint32_t dmub_dcn31_get_inbox1_rptr(struct dmub_srv *dmub);
 
 void dmub_dcn31_set_inbox1_wptr(struct dmub_srv *dmub, uint32_t wptr_offset);

diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.c
index 9c20516..d2f03f7 100644 (file)
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.c
@@ -266,6 +266,11 @@ void dmub_dcn32_setup_mailbox(struct dmub_srv *dmub,
        REG_WRITE(DMCUB_INBOX1_SIZE, inbox1->top - inbox1->base);
 }
 
+uint32_t dmub_dcn32_get_inbox1_wptr(struct dmub_srv *dmub)
+{
+       return REG_READ(DMCUB_INBOX1_WPTR);
+}
+
 uint32_t dmub_dcn32_get_inbox1_rptr(struct dmub_srv *dmub)
 {
        return REG_READ(DMCUB_INBOX1_RPTR);

diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.h b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.h
index 7d1a6eb..f15336b 100644 (file)
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.h
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.h
@@ -206,6 +206,8 @@ void dmub_dcn32_setup_windows(struct dmub_srv *dmub,
 void dmub_dcn32_setup_mailbox(struct dmub_srv *dmub,
                              const struct dmub_region *inbox1);
 
+uint32_t dmub_dcn32_get_inbox1_wptr(struct dmub_srv *dmub);
+
 uint32_t dmub_dcn32_get_inbox1_rptr(struct dmub_srv *dmub);
 
 void dmub_dcn32_set_inbox1_wptr(struct dmub_srv *dmub, uint32_t wptr_offset);

diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
index f58803d..6b8bd55 100644 (file)
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
@@ -167,6 +167,7 @@ static bool dmub_srv_hw_setup(struct dmub_srv *dmub, enum dmub_asic asic)
                funcs->backdoor_load = dmub_dcn20_backdoor_load;
                funcs->setup_windows = dmub_dcn20_setup_windows;
                funcs->setup_mailbox = dmub_dcn20_setup_mailbox;
+               funcs->get_inbox1_wptr = dmub_dcn20_get_inbox1_wptr;
                funcs->get_inbox1_rptr = dmub_dcn20_get_inbox1_rptr;
                funcs->set_inbox1_wptr = dmub_dcn20_set_inbox1_wptr;
                funcs->is_supported = dmub_dcn20_is_supported;
@@ -243,6 +244,7 @@ static bool dmub_srv_hw_setup(struct dmub_srv *dmub, enum dmub_asic asic)
                funcs->backdoor_load = dmub_dcn31_backdoor_load;
                funcs->setup_windows = dmub_dcn31_setup_windows;
                funcs->setup_mailbox = dmub_dcn31_setup_mailbox;
+               funcs->get_inbox1_wptr = dmub_dcn31_get_inbox1_wptr;
                funcs->get_inbox1_rptr = dmub_dcn31_get_inbox1_rptr;
                funcs->set_inbox1_wptr = dmub_dcn31_set_inbox1_wptr;
                funcs->setup_out_mailbox = dmub_dcn31_setup_out_mailbox;
@@ -281,6 +283,7 @@ static bool dmub_srv_hw_setup(struct dmub_srv *dmub, enum dmub_asic asic)
                funcs->backdoor_load_zfb_mode = dmub_dcn32_backdoor_load_zfb_mode;
                funcs->setup_windows = dmub_dcn32_setup_windows;
                funcs->setup_mailbox = dmub_dcn32_setup_mailbox;
+               funcs->get_inbox1_wptr = dmub_dcn32_get_inbox1_wptr;
                funcs->get_inbox1_rptr = dmub_dcn32_get_inbox1_rptr;
                funcs->set_inbox1_wptr = dmub_dcn32_set_inbox1_wptr;
                funcs->setup_out_mailbox = dmub_dcn32_setup_out_mailbox;
@@ -666,6 +669,20 @@ enum dmub_status dmub_srv_hw_init(struct dmub_srv *dmub,
        return DMUB_STATUS_OK;
 }
 
+enum dmub_status dmub_srv_sync_inbox1(struct dmub_srv *dmub)
+{
+       if (!dmub->sw_init)
+               return DMUB_STATUS_INVALID;
+
+       if (dmub->hw_funcs.get_inbox1_rptr && dmub->hw_funcs.get_inbox1_wptr) {
+               dmub->inbox1_rb.rptr = dmub->hw_funcs.get_inbox1_rptr(dmub);
+               dmub->inbox1_rb.wrpt = dmub->hw_funcs.get_inbox1_wptr(dmub);
+               dmub->inbox1_last_wptr = dmub->inbox1_rb.wrpt;
+       }
+
+       return DMUB_STATUS_OK;
+}
+
 enum dmub_status dmub_srv_hw_reset(struct dmub_srv *dmub)
 {
        if (!dmub->sw_init)