drm/radeon/si: properly handle internal cp ints

The internal cp interrupts need to be enabled and
disabled at specific times in order clockgating to
work properly.  This patch changes the handling
of the CP_INT_CNTL register to respect the current
state of the internal CP interrupts when making
changes to the other interrupts in CP_INT_CNTL.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/si.c

@@ -83,6 +83,8 @@ extern void si_dma_vm_set_page(struct radeon_device *rdev,
 			       uint64_t pe,
 			       uint64_t addr, unsigned count,
 			       uint32_t incr, uint32_t flags);
+static void si_enable_gui_idle_interrupt(struct radeon_device *rdev,
+					 bool enable);
 
 static const u32 verde_rlc_save_restore_register_list[] =
 {
@@ -3386,6 +3388,8 @@ static int si_cp_resume(struct radeon_device *rdev)
 	u32 rb_bufsz;
 	int r;
 
+	si_enable_gui_idle_interrupt(rdev, false);
+
 	WREG32(CP_SEM_WAIT_TIMER, 0x0);
 	WREG32(CP_SEM_INCOMPLETE_TIMER_CNTL, 0x0);
 
@@ -3501,6 +3505,8 @@ static int si_cp_resume(struct radeon_device *rdev)
 		rdev->ring[CAYMAN_RING_TYPE_CP2_INDEX].ready = false;
 	}
 
+	si_enable_gui_idle_interrupt(rdev, true);
+
 	return 0;
 }
 
@@ -5250,6 +5256,7 @@ void si_update_cg(struct radeon_device *rdev,
 		  u32 block, bool enable)
 {
 	if (block & RADEON_CG_BLOCK_GFX) {
+		si_enable_gui_idle_interrupt(rdev, false);
 		/* order matters! */
 		if (enable) {
 			si_enable_mgcg(rdev, true);
@@ -5258,6 +5265,7 @@ void si_update_cg(struct radeon_device *rdev,
 			si_enable_cgcg(rdev, false);
 			si_enable_mgcg(rdev, false);
 		}
+		si_enable_gui_idle_interrupt(rdev, true);
 	}
 
 	if (block & RADEON_CG_BLOCK_MC) {
@@ -5560,7 +5568,9 @@ static void si_disable_interrupt_state(struct radeon_device *rdev)
 {
 	u32 tmp;
 
-	WREG32(CP_INT_CNTL_RING0, CNTX_BUSY_INT_ENABLE | CNTX_EMPTY_INT_ENABLE);
+	tmp = RREG32(CP_INT_CNTL_RING0) &
+		(CNTX_BUSY_INT_ENABLE | CNTX_EMPTY_INT_ENABLE);
+	WREG32(CP_INT_CNTL_RING0, tmp);
 	WREG32(CP_INT_CNTL_RING1, 0);
 	WREG32(CP_INT_CNTL_RING2, 0);
 	tmp = RREG32(DMA_CNTL + DMA0_REGISTER_OFFSET) & ~TRAP_ENABLE;
@@ -5685,7 +5695,7 @@ static int si_irq_init(struct radeon_device *rdev)
 
 int si_irq_set(struct radeon_device *rdev)
 {
-	u32 cp_int_cntl = CNTX_BUSY_INT_ENABLE | CNTX_EMPTY_INT_ENABLE;
+	u32 cp_int_cntl;
 	u32 cp_int_cntl1 = 0, cp_int_cntl2 = 0;
 	u32 crtc1 = 0, crtc2 = 0, crtc3 = 0, crtc4 = 0, crtc5 = 0, crtc6 = 0;
 	u32 hpd1 = 0, hpd2 = 0, hpd3 = 0, hpd4 = 0, hpd5 = 0, hpd6 = 0;
@@ -5706,6 +5716,9 @@ int si_irq_set(struct radeon_device *rdev)
 		return 0;
 	}
 
+	cp_int_cntl = RREG32(CP_INT_CNTL_RING0) &
+		(CNTX_BUSY_INT_ENABLE | CNTX_EMPTY_INT_ENABLE);
+
 	if (!ASIC_IS_NODCE(rdev)) {
 		hpd1 = RREG32(DC_HPD1_INT_CONTROL) & ~DC_HPDx_INT_EN;
 		hpd2 = RREG32(DC_HPD2_INT_CONTROL) & ~DC_HPDx_INT_EN;