drm/radeon/kms: fix evergreen asic reset

commit 9f0c4f9c2f835eee1bbb93f96bf9483d56f1892b upstream.

Only reset the grbm blocks, srbm tends to lock the GPU
if not done properly and in most cases is not necessary.
Also, no need to call asic init after reset the grbm blocks.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index b7e60e562c41b4dad64c8e50ad4bb195611b2eaa..c500616bec6be3339c50e0da2b37e912597071e5 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -1406,7 +1406,6 @@ bool evergreen_gpu_is_lockup(struct radeon_device *rdev)
 static int evergreen_gpu_soft_reset(struct radeon_device *rdev)
 {
        struct evergreen_mc_save save;
-       u32 srbm_reset = 0;
        u32 grbm_reset = 0;
 
        dev_info(rdev->dev, "GPU softreset \n");
@@ -1445,16 +1444,6 @@ static int evergreen_gpu_soft_reset(struct radeon_device *rdev)
        udelay(50);
        WREG32(GRBM_SOFT_RESET, 0);
        (void)RREG32(GRBM_SOFT_RESET);
-
-       /* reset all the system blocks */
-       srbm_reset = SRBM_SOFT_RESET_ALL_MASK;
-
-       dev_info(rdev->dev, "  SRBM_SOFT_RESET=0x%08X\n", srbm_reset);
-       WREG32(SRBM_SOFT_RESET, srbm_reset);
-       (void)RREG32(SRBM_SOFT_RESET);
-       udelay(50);
-       WREG32(SRBM_SOFT_RESET, 0);
-       (void)RREG32(SRBM_SOFT_RESET);
        /* Wait a little for things to settle down */
        udelay(50);
        dev_info(rdev->dev, "  GRBM_STATUS=0x%08X\n",
@@ -1465,10 +1454,6 @@ static int evergreen_gpu_soft_reset(struct radeon_device *rdev)
                RREG32(GRBM_STATUS_SE1));
        dev_info(rdev->dev, "  SRBM_STATUS=0x%08X\n",
                RREG32(SRBM_STATUS));
-       /* After reset we need to reinit the asic as GPU often endup in an
-        * incoherent state.
-        */
-       atom_asic_init(rdev->mode_info.atom_context);
        evergreen_mc_resume(rdev, &save);
        return 0;
 }