drm/radeon/kms/r7xx: add workaround for hw issue with HDP flush
Use of HDP_*_COHERENCY_FLUSH_CNTL can cause a hang in certain situations. Add workaround. Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
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4 changed files with 28 additions and 3 deletions
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@ -884,7 +884,17 @@ void r600_pcie_gart_tlb_flush(struct radeon_device *rdev)
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u32 tmp;
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/* flush hdp cache so updates hit vram */
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WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);
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if ((rdev->family >= CHIP_RV770) && (rdev->family <= CHIP_RV740)) {
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void __iomem *ptr = (void *)rdev->gart.table.vram.ptr;
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u32 tmp;
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/* r7xx hw bug. write to HDP_DEBUG1 followed by fb read
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* rather than write to HDP_REG_COHERENCY_FLUSH_CNTL
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*/
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WREG32(HDP_DEBUG1, 0);
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tmp = readl((void __iomem *)ptr);
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} else
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WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);
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WREG32(VM_CONTEXT0_INVALIDATION_LOW_ADDR, rdev->mc.gtt_start >> 12);
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WREG32(VM_CONTEXT0_INVALIDATION_HIGH_ADDR, (rdev->mc.gtt_end - 1) >> 12);
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@ -3527,5 +3537,15 @@ int r600_debugfs_mc_info_init(struct radeon_device *rdev)
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*/
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void r600_ioctl_wait_idle(struct radeon_device *rdev, struct radeon_bo *bo)
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{
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WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);
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/* r7xx hw bug. write to HDP_DEBUG1 followed by fb read
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* rather than write to HDP_REG_COHERENCY_FLUSH_CNTL
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*/
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if ((rdev->family >= CHIP_RV770) && (rdev->family <= CHIP_RV740)) {
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void __iomem *ptr = (void *)rdev->gart.table.vram.ptr;
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u32 tmp;
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WREG32(HDP_DEBUG1, 0);
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tmp = readl((void __iomem *)ptr);
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} else
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WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);
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}
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@ -250,6 +250,7 @@
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#define HDP_NONSURFACE_SIZE 0x2C0C
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#define HDP_REG_COHERENCY_FLUSH_CNTL 0x54A0
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#define HDP_TILING_CONFIG 0x2F3C
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#define HDP_DEBUG1 0x2F34
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#define MC_VM_AGP_TOP 0x2184
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#define MC_VM_AGP_BOT 0x2188
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@ -204,7 +204,10 @@ static void rv770_mc_program(struct radeon_device *rdev)
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WREG32((0x2c20 + j), 0x00000000);
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WREG32((0x2c24 + j), 0x00000000);
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}
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WREG32(HDP_REG_COHERENCY_FLUSH_CNTL, 0);
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/* r7xx hw bug. Read from HDP_DEBUG1 rather
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* than writing to HDP_REG_COHERENCY_FLUSH_CNTL
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*/
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tmp = RREG32(HDP_DEBUG1);
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rv515_mc_stop(rdev, &save);
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if (r600_mc_wait_for_idle(rdev)) {
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@ -133,6 +133,7 @@
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#define HDP_NONSURFACE_SIZE 0x2C0C
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#define HDP_REG_COHERENCY_FLUSH_CNTL 0x54A0
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#define HDP_TILING_CONFIG 0x2F3C
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#define HDP_DEBUG1 0x2F34
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#define MC_SHARED_CHMAP 0x2004
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#define NOOFCHAN_SHIFT 12
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