[180/289] drm/radeon/kms: fix resume regression for some r5xx laptops

[Greg KH]

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Alex Deucher <alexdeucher@xxxxxxxxx>

commit f24d86f1a49505cdea56728b853a5d0a3f8e3d11 upstream.

I had removed this when I switched the atom indirect io methods
to use the io bar rather than the mmio bar, but it appears it's
still needed.

Reported-by: Mark Lord <kernel@xxxxxxxxxxxx>
Signed-off-by: Alex Deucher <alexdeucher@xxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/gpu/drm/radeon/atom.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/radeon/atom.c
+++ b/drivers/gpu/drm/radeon/atom.c
@@ -112,6 +112,7 @@ static uint32_t atom_iio_execute(struct
 			base += 3;
 			break;
 		case ATOM_IIO_WRITE:
+			(void)ctx->card->ioreg_read(ctx->card, CU16(base + 1));
 			ctx->card->ioreg_write(ctx->card, CU16(base + 1), temp);
 			base += 3;
 			break;


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