drm/radeon/kms: fix fans after resume

On pre-R600 asics, the SpeedFanControl table is not
executed as part of ASIC_Init as it is on newer asics.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=29412

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 15 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
index d1bd239cd9e..5ce9bf51a8d 100644
--- a/drivers/gpu/drm/radeon/atom.c
+++ b/drivers/gpu/drm/radeon/atom.c
@@ -1306,8 +1306,11 @@ struct atom_context *atom_parse(struct card_info *card, void *bios)
 
 int atom_asic_init(struct atom_context *ctx)
 {
+        struct radeon_device *rdev = ctx->card->dev->dev_private;
         int hwi = CU16(ctx->data_table + ATOM_DATA_FWI_PTR);
         uint32_t ps[16];
+        int ret;
+
         memset(ps, 0, 64);
 
         ps[0] = cpu_to_le32(CU32(hwi + ATOM_FWI_DEFSCLK_PTR));
@@ -1317,7 +1320,17 @@ int atom_asic_init(struct atom_context *ctx)
 
         if (!CU16(ctx->cmd_table + 4 + 2 * ATOM_CMD_INIT))
                 return 1;
-        return atom_execute_table(ctx, ATOM_CMD_INIT, ps);
+        ret = atom_execute_table(ctx, ATOM_CMD_INIT, ps);
+        if (ret)
+                return ret;
+
+        memset(ps, 0, 64);
+
+        if (rdev->family < CHIP_R600) {
+                if (CU16(ctx->cmd_table + 4 + 2 * ATOM_CMD_SPDFANCNTL))
+                        atom_execute_table(ctx, ATOM_CMD_SPDFANCNTL, ps);
+        }
+        return ret;
 }
 
 void atom_destroy(struct atom_context *ctx)
diff --git a/drivers/gpu/drm/radeon/atom.h b/drivers/gpu/drm/radeon/atom.h
index 93cfe2086ba..25fea631dad 100644
--- a/drivers/gpu/drm/radeon/atom.h
+++ b/drivers/gpu/drm/radeon/atom.h
@@ -44,6 +44,7 @@
 #define ATOM_CMD_SETSCLK        0x0A
 #define ATOM_CMD_SETMCLK        0x0B
 #define ATOM_CMD_SETPCLK        0x0C
+#define ATOM_CMD_SPDFANCNTL     0x39
 
 #define ATOM_DATA_FWI_PTR       0xC
 #define ATOM_DATA_IIO_PTR       0x32