drm/radeon/kms: fix suspend on rv530 asics

Apparently only rv515 asics need the workaround
added in f24d86f1a49505cdea56728b853a5d0a3f8e3d11
(drm/radeon/kms: fix resume regression for some r5xx laptops).

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=34709

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
index 258fa5e7a2d9..d71d375149f8 100644
--- a/drivers/gpu/drm/radeon/atom.c
+++ b/drivers/gpu/drm/radeon/atom.c
@@ -32,6 +32,7 @@
 #include "atom.h"
 #include "atom-names.h"
 #include "atom-bits.h"
+#include "radeon.h"
 
 #define ATOM_COND_ABOVE         0
 #define ATOM_COND_ABOVEOREQUAL  1
@@ -101,7 +102,9 @@ static void debug_print_spaces(int n)
 static uint32_t atom_iio_execute(struct atom_context *ctx, int base,
                                  uint32_t index, uint32_t data)
 {
+        struct radeon_device *rdev = ctx->card->dev->dev_private;
         uint32_t temp = 0xCDCDCDCD;
+
         while (1)
                 switch (CU8(base)) {
                 case ATOM_IIO_NOP:
@@ -112,7 +115,8 @@ static uint32_t atom_iio_execute(struct atom_context *ctx, int base,
                         base += 3;
                         break;
                 case ATOM_IIO_WRITE:
-                        (void)ctx->card->ioreg_read(ctx->card, CU16(base + 1));
+                        if (rdev->family == CHIP_RV515)
+                                (void)ctx->card->ioreg_read(ctx->card, CU16(base + 1));
                         ctx->card->ioreg_write(ctx->card, CU16(base + 1), temp);
                         base += 3;
                         break;