drm/radeon: switch to a finer grained reset for evergreen

No change in functionality as we currently set all the reset
flags.

Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index dcdff14dc13fd9a0ba602271883a4c29dd6d2851..061fa0a28900612506e8af0b8c44e9d633fdb2d5 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -2306,15 +2306,13 @@ bool evergreen_gpu_is_lockup(struct radeon_device *rdev, struct radeon_ring *rin
        return radeon_ring_test_lockup(rdev, ring);
 }
 
-static int evergreen_gpu_soft_reset(struct radeon_device *rdev)
+static void evergreen_gpu_soft_reset_gfx(struct radeon_device *rdev)
 {
-       struct evergreen_mc_save save;
-       u32 grbm_reset = 0, tmp;
+       u32 grbm_reset = 0;
 
        if (!(RREG32(GRBM_STATUS) & GUI_ACTIVE))
-               return 0;
+               return;
 
-       dev_info(rdev->dev, "GPU softreset \n");
        dev_info(rdev->dev, "  GRBM_STATUS               = 0x%08X\n",
                RREG32(GRBM_STATUS));
        dev_info(rdev->dev, "  GRBM_STATUS_SE0           = 0x%08X\n",
@@ -2331,27 +2329,10 @@ static int evergreen_gpu_soft_reset(struct radeon_device *rdev)
                RREG32(CP_BUSY_STAT));
        dev_info(rdev->dev, "  R_008680_CP_STAT          = 0x%08X\n",
                RREG32(CP_STAT));
-       dev_info(rdev->dev, "  R_00D034_DMA_STATUS_REG   = 0x%08X\n",
-               RREG32(DMA_STATUS_REG));
-       evergreen_mc_stop(rdev, &save);
-       if (evergreen_mc_wait_for_idle(rdev)) {
-               dev_warn(rdev->dev, "Wait for MC idle timedout !\n");
-       }
 
        /* Disable CP parsing/prefetching */
        WREG32(CP_ME_CNTL, CP_ME_HALT | CP_PFP_HALT);
 
-       /* Disable DMA */
-       tmp = RREG32(DMA_RB_CNTL);
-       tmp &= ~DMA_RB_ENABLE;
-       WREG32(DMA_RB_CNTL, tmp);
-
-       /* Reset dma */
-       WREG32(SRBM_SOFT_RESET, SOFT_RESET_DMA);
-       RREG32(SRBM_SOFT_RESET);
-       udelay(50);
-       WREG32(SRBM_SOFT_RESET, 0);
-
        /* reset all the gfx blocks */
        grbm_reset = (SOFT_RESET_CP |
                      SOFT_RESET_CB |
@@ -2372,8 +2353,7 @@ static int evergreen_gpu_soft_reset(struct radeon_device *rdev)
        udelay(50);
        WREG32(GRBM_SOFT_RESET, 0);
        (void)RREG32(GRBM_SOFT_RESET);
-       /* Wait a little for things to settle down */
-       udelay(50);
+
        dev_info(rdev->dev, "  GRBM_STATUS               = 0x%08X\n",
                RREG32(GRBM_STATUS));
        dev_info(rdev->dev, "  GRBM_STATUS_SE0           = 0x%08X\n",
@@ -2390,15 +2370,65 @@ static int evergreen_gpu_soft_reset(struct radeon_device *rdev)
                RREG32(CP_BUSY_STAT));
        dev_info(rdev->dev, "  R_008680_CP_STAT          = 0x%08X\n",
                RREG32(CP_STAT));
+}
+
+static void evergreen_gpu_soft_reset_dma(struct radeon_device *rdev)
+{
+       u32 tmp;
+
+       if (RREG32(DMA_STATUS_REG) & DMA_IDLE)
+               return;
+
+       dev_info(rdev->dev, "  R_00D034_DMA_STATUS_REG   = 0x%08X\n",
+               RREG32(DMA_STATUS_REG));
+
+       /* Disable DMA */
+       tmp = RREG32(DMA_RB_CNTL);
+       tmp &= ~DMA_RB_ENABLE;
+       WREG32(DMA_RB_CNTL, tmp);
+
+       /* Reset dma */
+       WREG32(SRBM_SOFT_RESET, SOFT_RESET_DMA);
+       RREG32(SRBM_SOFT_RESET);
+       udelay(50);
+       WREG32(SRBM_SOFT_RESET, 0);
+
        dev_info(rdev->dev, "  R_00D034_DMA_STATUS_REG   = 0x%08X\n",
                RREG32(DMA_STATUS_REG));
+}
+
+static int evergreen_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask)
+{
+       struct evergreen_mc_save save;
+
+       if (reset_mask == 0)
+               return 0;
+
+       dev_info(rdev->dev, "GPU softreset: 0x%08X\n", reset_mask);
+
+       evergreen_mc_stop(rdev, &save);
+       if (evergreen_mc_wait_for_idle(rdev)) {
+               dev_warn(rdev->dev, "Wait for MC idle timedout !\n");
+       }
+
+       if (reset_mask & (RADEON_RESET_GFX | RADEON_RESET_COMPUTE))
+               evergreen_gpu_soft_reset_gfx(rdev);
+
+       if (reset_mask & RADEON_RESET_DMA)
+               evergreen_gpu_soft_reset_dma(rdev);
+
+       /* Wait a little for things to settle down */
+       udelay(50);
+
        evergreen_mc_resume(rdev, &save);
        return 0;
 }
 
 int evergreen_asic_reset(struct radeon_device *rdev)
 {
-       return evergreen_gpu_soft_reset(rdev);
+       return evergreen_gpu_soft_reset(rdev, (RADEON_RESET_GFX |
+                                              RADEON_RESET_COMPUTE |
+                                              RADEON_RESET_DMA));
 }
 
 /* Interrupts */

diff --git a/drivers/gpu/drm/radeon/evergreend.h b/drivers/gpu/drm/radeon/evergreend.h
index 5786a32e7bdae26ac1de91f51b53202c5bdc0069..0bfd0e9e469b57ca395049ce1dfae500b67b3936 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreend.h
+++ b/drivers/gpu/drm/radeon/evergreend.h
@@ -2037,5 +2037,6 @@
 #       define DMA_RPTR_WRITEBACK_SWAP_ENABLE             (1 << 13)  /* 8IN32 */
 #       define DMA_RPTR_WRITEBACK_TIMER(x)                ((x) << 16) /* log2 */
 #define DMA_STATUS_REG                                    0xd034
+#       define DMA_IDLE                                   (1 << 0)
 
 #endif