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From: Greg KH on 6 Aug 2010 15:40
2.6.34-stable review patch. If anyone has any objections, please let us know.

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

From: Alex Deucher <alexdeucher(a)gmail.com>

commit 812d046915f48236657f02c06d7dc47140e9ceda upstream.

Use of HDP_*_COHERENCY_FLUSH_CNTL can cause a hang in certain
situations. Add workaround.

Signed-off-by: Alex Deucher <alexdeucher(a)gmail.com>
Signed-off-by: Dave Airlie <airlied(a)redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
drivers/gpu/drm/radeon/r600.c | 24 ++++++++++++++++++++++--
drivers/gpu/drm/radeon/r600d.h | 1 +
drivers/gpu/drm/radeon/rv770.c | 5 ++++-
drivers/gpu/drm/radeon/rv770d.h | 1 +
4 files changed, 28 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -361,7 +361,17 @@ void r600_pcie_gart_tlb_flush(struct rad
u32 tmp;

/* flush hdp cache so updates hit vram */
- WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);
+ if ((rdev->family >= CHIP_RV770) && (rdev->family <= CHIP_RV740)) {
+ void __iomem *ptr = (void *)rdev->gart.table.vram.ptr;
+ u32 tmp;
+
+ /* r7xx hw bug. write to HDP_DEBUG1 followed by fb read
+ * rather than write to HDP_REG_COHERENCY_FLUSH_CNTL
+ */
+ WREG32(HDP_DEBUG1, 0);
+ tmp = readl((void __iomem *)ptr);
+ } else
+ WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);

WREG32(VM_CONTEXT0_INVALIDATION_LOW_ADDR, rdev->mc.gtt_start >> 12);
WREG32(VM_CONTEXT0_INVALIDATION_HIGH_ADDR, (rdev->mc.gtt_end - 1) >> 12);
@@ -2949,5 +2959,15 @@ int r600_debugfs_mc_info_init(struct rad
*/
void r600_ioctl_wait_idle(struct radeon_device *rdev, struct radeon_bo *bo)
{
- WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);
+ /* r7xx hw bug. write to HDP_DEBUG1 followed by fb read
+ * rather than write to HDP_REG_COHERENCY_FLUSH_CNTL
+ */
+ if ((rdev->family >= CHIP_RV770) && (rdev->family <= CHIP_RV740)) {
+ void __iomem *ptr = (void *)rdev->gart.table.vram.ptr;
+ u32 tmp;
+
+ WREG32(HDP_DEBUG1, 0);
+ tmp = readl((void __iomem *)ptr);
+ } else
+ WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);
}
--- a/drivers/gpu/drm/radeon/r600d.h
+++ b/drivers/gpu/drm/radeon/r600d.h
@@ -245,6 +245,7 @@
#define HDP_NONSURFACE_SIZE 0x2C0C
#define HDP_REG_COHERENCY_FLUSH_CNTL 0x54A0
#define HDP_TILING_CONFIG 0x2F3C
+#define HDP_DEBUG1 0x2F34

#define MC_VM_AGP_TOP 0x2184
#define MC_VM_AGP_BOT 0x2188
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -174,7 +174,10 @@ static void rv770_mc_program(struct rade
WREG32((0x2c20 + j), 0x00000000);
WREG32((0x2c24 + j), 0x00000000);
}
- WREG32(HDP_REG_COHERENCY_FLUSH_CNTL, 0);
+ /* r7xx hw bug. Read from HDP_DEBUG1 rather
+ * than writing to HDP_REG_COHERENCY_FLUSH_CNTL
+ */
+ tmp = RREG32(HDP_DEBUG1);

rv515_mc_stop(rdev, &save);
if (r600_mc_wait_for_idle(rdev)) {
--- a/drivers/gpu/drm/radeon/rv770d.h
+++ b/drivers/gpu/drm/radeon/rv770d.h
@@ -128,6 +128,7 @@
#define HDP_NONSURFACE_SIZE 0x2C0C
#define HDP_REG_COHERENCY_FLUSH_CNTL 0x54A0
#define HDP_TILING_CONFIG 0x2F3C
+#define HDP_DEBUG1 0x2F34

#define MC_SHARED_CHMAP 0x2004
#define NOOFCHAN_SHIFT 12


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