drm/amd/display: Support for DMUB AUX

[WHY]
To process AUX transactions with DMUB using inbox1 and outbox1 mail boxes.

[How]
1) Added inbox1 command DMUB_CMD__DP_AUX_ACCESS to issue AUX commands
   to DMUB in dc_process_dmub_aux_transfer_async(). DMUB processes AUX cmd
   with DCN and sends reply back in an outbox1 message triggering an
   outbox1 interrupt to driver.
2) In existing driver implementation, AUX commands are processed
   synchronously by configuring DCN reg. But in DMUB AUX, driver sends an
   inbox1 message and waits for a conditional variable (CV) which will be
   signaled by outbox1 ISR.
3) DM will retrieve Outbox1 message and send back reply to upper layer
   and complete the AUX command

Signed-off-by: Jude Shih <shenshih@amd.com>
Reviewed-by: Hanghong Ma <Hanghong.Ma@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Wayne Lin <Wayne.Lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 26 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
index b3ed7e777720..40f617bbb86f 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
@@ -769,6 +769,18 @@ static int amdgpu_dm_set_vline0_irq_state(struct amdgpu_device *adev,
 		__func__);
 }
 
+static int amdgpu_dm_set_dmub_outbox_irq_state(struct amdgpu_device *adev,
+					struct amdgpu_irq_src *source,
+					unsigned int crtc_id,
+					enum amdgpu_interrupt_state state)
+{
+	enum dc_irq_source irq_source = DC_IRQ_SOURCE_DMCUB_OUTBOX;
+	bool st = (state == AMDGPU_IRQ_STATE_ENABLE);
+
+	dc_interrupt_set(adev->dm.dc, irq_source, st);
+	return 0;
+}
+
 static int amdgpu_dm_set_vupdate_irq_state(struct amdgpu_device *adev,
 					   struct amdgpu_irq_src *source,
 					   unsigned int crtc_id,
@@ -805,6 +817,11 @@ static const struct amdgpu_irq_src_funcs dm_vline0_irq_funcs = {
 	.process = amdgpu_dm_irq_handler,
 };
 
+static const struct amdgpu_irq_src_funcs dm_dmub_outbox_irq_funcs = {
+	.set = amdgpu_dm_set_dmub_outbox_irq_state,
+	.process = amdgpu_dm_irq_handler,
+};
+
 static const struct amdgpu_irq_src_funcs dm_vupdate_irq_funcs = {
 	.set = amdgpu_dm_set_vupdate_irq_state,
 	.process = amdgpu_dm_irq_handler,
@@ -827,13 +844,15 @@ static const struct amdgpu_irq_src_funcs dm_hpd_irq_funcs = {
 
 void amdgpu_dm_set_irq_funcs(struct amdgpu_device *adev)
 {
-
 	adev->crtc_irq.num_types = adev->mode_info.num_crtc;
 	adev->crtc_irq.funcs = &dm_crtc_irq_funcs;
 
 	adev->vline0_irq.num_types = adev->mode_info.num_crtc;
 	adev->vline0_irq.funcs = &dm_vline0_irq_funcs;
 
+	adev->dmub_outbox_irq.num_types = 1;
+	adev->dmub_outbox_irq.funcs = &dm_dmub_outbox_irq_funcs;
+
 	adev->vupdate_irq.num_types = adev->mode_info.num_crtc;
 	adev->vupdate_irq.funcs = &dm_vupdate_irq_funcs;
 
@@ -846,6 +865,12 @@ void amdgpu_dm_set_irq_funcs(struct amdgpu_device *adev)
 	adev->hpd_irq.num_types = adev->mode_info.num_hpd;
 	adev->hpd_irq.funcs = &dm_hpd_irq_funcs;
 }
+void amdgpu_dm_outbox_init(struct amdgpu_device *adev)
+{
+	dc_interrupt_set(adev->dm.dc,
+		DC_IRQ_SOURCE_DMCUB_OUTBOX,
+		true);
+}
 
 /**
  * amdgpu_dm_hpd_init - hpd setup callback.