drm/radeon: implement pci config reset for CIK (v3)
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: fix rebase
v3: hide behind module parameter
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 e66eb47..9e50dd5 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -4880,6 +4880,160 @@
cik_print_gpu_status_regs(rdev);
}
+struct kv_reset_save_regs {
+ u32 gmcon_reng_execute;
+ u32 gmcon_misc;
+ u32 gmcon_misc3;
+};
+
+static void kv_save_regs_for_reset(struct radeon_device *rdev,
+ struct kv_reset_save_regs *save)
+{
+ save->gmcon_reng_execute = RREG32(GMCON_RENG_EXECUTE);
+ save->gmcon_misc = RREG32(GMCON_MISC);
+ save->gmcon_misc3 = RREG32(GMCON_MISC3);
+
+ WREG32(GMCON_RENG_EXECUTE, save->gmcon_reng_execute & ~RENG_EXECUTE_ON_PWR_UP);
+ WREG32(GMCON_MISC, save->gmcon_misc & ~(RENG_EXECUTE_ON_REG_UPDATE |
+ STCTRL_STUTTER_EN));
+}
+
+static void kv_restore_regs_for_reset(struct radeon_device *rdev,
+ struct kv_reset_save_regs *save)
+{
+ int i;
+
+ WREG32(GMCON_PGFSM_WRITE, 0);
+ WREG32(GMCON_PGFSM_CONFIG, 0x200010ff);
+
+ for (i = 0; i < 5; i++)
+ WREG32(GMCON_PGFSM_WRITE, 0);
+
+ WREG32(GMCON_PGFSM_WRITE, 0);
+ WREG32(GMCON_PGFSM_CONFIG, 0x300010ff);
+
+ for (i = 0; i < 5; i++)
+ WREG32(GMCON_PGFSM_WRITE, 0);
+
+ WREG32(GMCON_PGFSM_WRITE, 0x210000);
+ WREG32(GMCON_PGFSM_CONFIG, 0xa00010ff);
+
+ for (i = 0; i < 5; i++)
+ WREG32(GMCON_PGFSM_WRITE, 0);
+
+ WREG32(GMCON_PGFSM_WRITE, 0x21003);
+ WREG32(GMCON_PGFSM_CONFIG, 0xb00010ff);
+
+ for (i = 0; i < 5; i++)
+ WREG32(GMCON_PGFSM_WRITE, 0);
+
+ WREG32(GMCON_PGFSM_WRITE, 0x2b00);
+ WREG32(GMCON_PGFSM_CONFIG, 0xc00010ff);
+
+ for (i = 0; i < 5; i++)
+ WREG32(GMCON_PGFSM_WRITE, 0);
+
+ WREG32(GMCON_PGFSM_WRITE, 0);
+ WREG32(GMCON_PGFSM_CONFIG, 0xd00010ff);
+
+ for (i = 0; i < 5; i++)
+ WREG32(GMCON_PGFSM_WRITE, 0);
+
+ WREG32(GMCON_PGFSM_WRITE, 0x420000);
+ WREG32(GMCON_PGFSM_CONFIG, 0x100010ff);
+
+ for (i = 0; i < 5; i++)
+ WREG32(GMCON_PGFSM_WRITE, 0);
+
+ WREG32(GMCON_PGFSM_WRITE, 0x120202);
+ WREG32(GMCON_PGFSM_CONFIG, 0x500010ff);
+
+ for (i = 0; i < 5; i++)
+ WREG32(GMCON_PGFSM_WRITE, 0);
+
+ WREG32(GMCON_PGFSM_WRITE, 0x3e3e36);
+ WREG32(GMCON_PGFSM_CONFIG, 0x600010ff);
+
+ for (i = 0; i < 5; i++)
+ WREG32(GMCON_PGFSM_WRITE, 0);
+
+ WREG32(GMCON_PGFSM_WRITE, 0x373f3e);
+ WREG32(GMCON_PGFSM_CONFIG, 0x700010ff);
+
+ for (i = 0; i < 5; i++)
+ WREG32(GMCON_PGFSM_WRITE, 0);
+
+ WREG32(GMCON_PGFSM_WRITE, 0x3e1332);
+ WREG32(GMCON_PGFSM_CONFIG, 0xe00010ff);
+
+ WREG32(GMCON_MISC3, save->gmcon_misc3);
+ WREG32(GMCON_MISC, save->gmcon_misc);
+ WREG32(GMCON_RENG_EXECUTE, save->gmcon_reng_execute);
+}
+
+static void cik_gpu_pci_config_reset(struct radeon_device *rdev)
+{
+ struct evergreen_mc_save save;
+ struct kv_reset_save_regs kv_save = { 0 };
+ u32 tmp, i;
+
+ dev_info(rdev->dev, "GPU pci config reset\n");
+
+ /* disable dpm? */
+
+ /* disable cg/pg */
+ cik_fini_pg(rdev);
+ cik_fini_cg(rdev);
+
+ /* Disable GFX parsing/prefetching */
+ WREG32(CP_ME_CNTL, CP_ME_HALT | CP_PFP_HALT | CP_CE_HALT);
+
+ /* Disable MEC parsing/prefetching */
+ WREG32(CP_MEC_CNTL, MEC_ME1_HALT | MEC_ME2_HALT);
+
+ /* sdma0 */
+ tmp = RREG32(SDMA0_ME_CNTL + SDMA0_REGISTER_OFFSET);
+ tmp |= SDMA_HALT;
+ WREG32(SDMA0_ME_CNTL + SDMA0_REGISTER_OFFSET, tmp);
+ /* sdma1 */
+ tmp = RREG32(SDMA0_ME_CNTL + SDMA1_REGISTER_OFFSET);
+ tmp |= SDMA_HALT;
+ WREG32(SDMA0_ME_CNTL + SDMA1_REGISTER_OFFSET, tmp);
+ /* XXX other engines? */
+
+ /* halt the rlc, disable cp internal ints */
+ cik_rlc_stop(rdev);
+
+ udelay(50);
+
+ /* 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");
+ }
+
+ if (rdev->flags & RADEON_IS_IGP)
+ kv_save_regs_for_reset(rdev, &kv_save);
+
+ /* disable BM */
+ pci_clear_master(rdev->pdev);
+ /* reset */
+ radeon_pci_config_reset(rdev);
+
+ udelay(100);
+
+ /* wait for asic to come out of reset */
+ for (i = 0; i < rdev->usec_timeout; i++) {
+ if (RREG32(CONFIG_MEMSIZE) != 0xffffffff)
+ break;
+ udelay(1);
+ }
+
+ /* does asic init need to be run first??? */
+ if (rdev->flags & RADEON_IS_IGP)
+ kv_restore_regs_for_reset(rdev, &kv_save);
+}
+
/**
* cik_asic_reset - soft reset GPU
*
@@ -4898,10 +5052,17 @@
if (reset_mask)
r600_set_bios_scratch_engine_hung(rdev, true);
+ /* try soft reset */
cik_gpu_soft_reset(rdev, reset_mask);
reset_mask = cik_gpu_check_soft_reset(rdev);
+ /* try pci config reset */
+ if (reset_mask && radeon_hard_reset)
+ cik_gpu_pci_config_reset(rdev);
+
+ reset_mask = cik_gpu_check_soft_reset(rdev);
+
if (!reset_mask)
r600_set_bios_scratch_engine_hung(rdev, false);