drm/radeon/kms: fix regression rendering issue on R6XX/R7XX

It seems that some R6XX/R7XX silently ignore HDP flush when
programmed through ring, this patch addback an ioctl callback
to allow R6XX/R7XX hw to perform such flush through MMIO in
order to fix a regression. For more details see:

http://bugzilla.kernel.org/show_bug.cgi?id=15186

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

4 files changed, 36 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 8c94040cb7f2..45d565bae71b 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -2900,3 +2900,18 @@ int r600_debugfs_mc_info_init(struct radeon_device *rdev)
         return 0;
 #endif
 }
+
+/**
+ * r600_ioctl_wait_idle - flush host path cache on wait idle ioctl
+ * rdev: radeon device structure
+ * bo: buffer object struct which userspace is waiting for idle
+ *
+ * Some R6XX/R7XX doesn't seems to take into account HDP flush performed
+ * through ring buffer, this leads to corruption in rendering, see
+ * http://bugzilla.kernel.org/show_bug.cgi?id=15186 to avoid this we
+ * directly perform HDP flush by writing register through MMIO.
+ */
+void r600_ioctl_wait_idle(struct radeon_device *rdev, struct radeon_bo *bo)
+{
+        WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);
+}
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 2d5f2bfa7201..37150fc406b5 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -661,6 +661,13 @@ struct radeon_asic {
         void (*hpd_fini)(struct radeon_device *rdev);
         bool (*hpd_sense)(struct radeon_device *rdev, enum radeon_hpd_id hpd);
         void (*hpd_set_polarity)(struct radeon_device *rdev, enum radeon_hpd_id hpd);
+        /* ioctl hw specific callback. Some hw might want to perform special
+         * operation on specific ioctl. For instance on wait idle some hw
+         * might want to perform and HDP flush through MMIO as it seems that
+         * some R6XX/R7XX hw doesn't take HDP flush into account if programmed
+         * through ring.
+         */
+        void (*ioctl_wait_idle)(struct radeon_device *rdev, struct radeon_bo *bo);
 };
 
 /*
diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index f2fbd2e4e9df..05ee1aeac3fd 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -117,6 +117,7 @@ static struct radeon_asic r100_asic = {
         .hpd_fini = &r100_hpd_fini,
         .hpd_sense = &r100_hpd_sense,
         .hpd_set_polarity = &r100_hpd_set_polarity,
+        .ioctl_wait_idle = NULL,
 };
 
 
@@ -176,6 +177,7 @@ static struct radeon_asic r300_asic = {
         .hpd_fini = &r100_hpd_fini,
         .hpd_sense = &r100_hpd_sense,
         .hpd_set_polarity = &r100_hpd_set_polarity,
+        .ioctl_wait_idle = NULL,
 };
 
 /*
@@ -219,6 +221,7 @@ static struct radeon_asic r420_asic = {
         .hpd_fini = &r100_hpd_fini,
         .hpd_sense = &r100_hpd_sense,
         .hpd_set_polarity = &r100_hpd_set_polarity,
+        .ioctl_wait_idle = NULL,
 };
 
 
@@ -267,6 +270,7 @@ static struct radeon_asic rs400_asic = {
         .hpd_fini = &r100_hpd_fini,
         .hpd_sense = &r100_hpd_sense,
         .hpd_set_polarity = &r100_hpd_set_polarity,
+        .ioctl_wait_idle = NULL,
 };
 
 
@@ -323,6 +327,7 @@ static struct radeon_asic rs600_asic = {
         .hpd_fini = &rs600_hpd_fini,
         .hpd_sense = &rs600_hpd_sense,
         .hpd_set_polarity = &rs600_hpd_set_polarity,
+        .ioctl_wait_idle = NULL,
 };
 
 
@@ -370,6 +375,7 @@ static struct radeon_asic rs690_asic = {
         .hpd_fini = &rs600_hpd_fini,
         .hpd_sense = &rs600_hpd_sense,
         .hpd_set_polarity = &rs600_hpd_set_polarity,
+        .ioctl_wait_idle = NULL,
 };
 
 
@@ -421,6 +427,7 @@ static struct radeon_asic rv515_asic = {
         .hpd_fini = &rs600_hpd_fini,
         .hpd_sense = &rs600_hpd_sense,
         .hpd_set_polarity = &rs600_hpd_set_polarity,
+        .ioctl_wait_idle = NULL,
 };
 
 
@@ -463,6 +470,7 @@ static struct radeon_asic r520_asic = {
         .hpd_fini = &rs600_hpd_fini,
         .hpd_sense = &rs600_hpd_sense,
         .hpd_set_polarity = &rs600_hpd_set_polarity,
+        .ioctl_wait_idle = NULL,
 };
 
 /*
@@ -504,6 +512,7 @@ void r600_hpd_fini(struct radeon_device *rdev);
 bool r600_hpd_sense(struct radeon_device *rdev, enum radeon_hpd_id hpd);
 void r600_hpd_set_polarity(struct radeon_device *rdev,
                            enum radeon_hpd_id hpd);
+extern void r600_ioctl_wait_idle(struct radeon_device *rdev, struct radeon_bo *bo);
 
 static struct radeon_asic r600_asic = {
         .init = &r600_init,
@@ -538,6 +547,7 @@ static struct radeon_asic r600_asic = {
         .hpd_fini = &r600_hpd_fini,
         .hpd_sense = &r600_hpd_sense,
         .hpd_set_polarity = &r600_hpd_set_polarity,
+        .ioctl_wait_idle = r600_ioctl_wait_idle,
 };
 
 /*
@@ -582,6 +592,7 @@ static struct radeon_asic rv770_asic = {
         .hpd_fini = &r600_hpd_fini,
         .hpd_sense = &r600_hpd_sense,
         .hpd_set_polarity = &r600_hpd_set_polarity,
+        .ioctl_wait_idle = r600_ioctl_wait_idle,
 };
 
 #endif
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index 0e1325e18534..db8e9a355a01 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -308,6 +308,9 @@ int radeon_gem_wait_idle_ioctl(struct drm_device *dev, void *data,
         }
         robj = gobj->driver_private;
         r = radeon_bo_wait(robj, NULL, false);
+        /* callback hw specific functions if any */
+        if (robj->rdev->asic->ioctl_wait_idle)
+                robj->rdev->asic->ioctl_wait_idle(robj->rdev, robj);
         mutex_lock(&dev->struct_mutex);
         drm_gem_object_unreference(gobj);
         mutex_unlock(&dev->struct_mutex);