drm/radeon: fix for memory training on bonaire 0x6649
Workaround for memory link training on certain variants
of 0x6649.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 377afa50..57a359d 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -1806,7 +1806,7 @@
{
const __be32 *fw_data = NULL;
const __le32 *new_fw_data = NULL;
- u32 running, blackout = 0;
+ u32 running, blackout = 0, tmp;
u32 *io_mc_regs = NULL;
const __le32 *new_io_mc_regs = NULL;
int i, regs_size, ucode_size;
@@ -1866,6 +1866,15 @@
WREG32(MC_SEQ_IO_DEBUG_DATA, io_mc_regs[(i << 1) + 1]);
}
}
+
+ tmp = RREG32(MC_SEQ_MISC0);
+ if ((rdev->pdev->device == 0x6649) && ((tmp & 0xff00) == 0x5600)) {
+ WREG32(MC_SEQ_IO_DEBUG_INDEX, 5);
+ WREG32(MC_SEQ_IO_DEBUG_DATA, 0x00000023);
+ WREG32(MC_SEQ_IO_DEBUG_INDEX, 9);
+ WREG32(MC_SEQ_IO_DEBUG_DATA, 0x000001f0);
+ }
+
/* load the MC ucode */
for (i = 0; i < ucode_size; i++) {
if (rdev->new_fw)