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authorAlex Deucher <alexander.deucher@amd.com>2013-11-01 16:25:10 -0400
committerAlex Deucher <alexander.deucher@amd.com>2014-01-08 18:42:23 -0500
commitb5470b036e14d063655cc01d22ea5d727042860a (patch)
tree8420fd1eb90c039550fd922ea86a75f043b834bd /drivers/gpu/drm/radeon/evergreen.c
parentde9ae7447aaa2fed8ae4aa9e6b7260915e5b4f7b (diff)
drm/radeon: implement pci config reset for evergreen/cayman (v2)
pci config reset is a low level reset that resets the entire chip from the bus interface. It can be more reliable if soft reset fails. v2: put behind module parameter Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/evergreen.c')
-rw-r--r--drivers/gpu/drm/radeon/evergreen.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 21d975007037..4116d0279596 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -146,6 +146,7 @@ extern u32 si_get_csb_size(struct radeon_device *rdev);
extern void si_get_csb_buffer(struct radeon_device *rdev, volatile u32 *buffer);
extern u32 cik_get_csb_size(struct radeon_device *rdev);
extern void cik_get_csb_buffer(struct radeon_device *rdev, volatile u32 *buffer);
+extern void rv770_set_clk_bypass_mode(struct radeon_device *rdev);
static const u32 evergreen_golden_registers[] =
{
@@ -3867,6 +3868,48 @@ static void evergreen_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask)
evergreen_print_gpu_status_regs(rdev);
}
+void evergreen_gpu_pci_config_reset(struct radeon_device *rdev)
+{
+ struct evergreen_mc_save save;
+ u32 tmp, i;
+
+ dev_info(rdev->dev, "GPU pci config reset\n");
+
+ /* disable dpm? */
+
+ /* Disable CP parsing/prefetching */
+ WREG32(CP_ME_CNTL, CP_ME_HALT | CP_PFP_HALT);
+ udelay(50);
+ /* Disable DMA */
+ tmp = RREG32(DMA_RB_CNTL);
+ tmp &= ~DMA_RB_ENABLE;
+ WREG32(DMA_RB_CNTL, tmp);
+ /* XXX other engines? */
+
+ /* halt the rlc */
+ r600_rlc_stop(rdev);
+
+ udelay(50);
+
+ /* set mclk/sclk to bypass */
+ rv770_set_clk_bypass_mode(rdev);
+ /* disable BM */
+ pci_clear_master(rdev->pdev);
+ /* disable mem access */
+ evergreen_mc_stop(rdev, &save);
+ if (evergreen_mc_wait_for_idle(rdev)) {
+ dev_warn(rdev->dev, "Wait for MC idle timed out !\n");
+ }
+ /* reset */
+ radeon_pci_config_reset(rdev);
+ /* wait for asic to come out of reset */
+ for (i = 0; i < rdev->usec_timeout; i++) {
+ if (RREG32(CONFIG_MEMSIZE) != 0xffffffff)
+ break;
+ udelay(1);
+ }
+}
+
int evergreen_asic_reset(struct radeon_device *rdev)
{
u32 reset_mask;
@@ -3876,10 +3919,17 @@ int evergreen_asic_reset(struct radeon_device *rdev)
if (reset_mask)
r600_set_bios_scratch_engine_hung(rdev, true);
+ /* try soft reset */
evergreen_gpu_soft_reset(rdev, reset_mask);
reset_mask = evergreen_gpu_check_soft_reset(rdev);
+ /* try pci config reset */
+ if (reset_mask && radeon_hard_reset)
+ evergreen_gpu_pci_config_reset(rdev);
+
+ reset_mask = evergreen_gpu_check_soft_reset(rdev);
+
if (!reset_mask)
r600_set_bios_scratch_engine_hung(rdev, false);