From 4a5c8ea59f8360f354158fca039ee7fbef0fa4dd Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Fri, 15 Nov 2013 16:35:55 -0500 Subject: [PATCH] drm/radeon: implement pci config reset for SI (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: hide behind module parameter Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/si.c | 109 +++++++++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/radeon/sid.h | 7 +++ 2 files changed, 116 insertions(+) diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c index c698e3f..626163e 100644 --- a/drivers/gpu/drm/radeon/si.c +++ b/drivers/gpu/drm/radeon/si.c @@ -80,6 +80,8 @@ extern void evergreen_print_gpu_status_regs(struct radeon_device *rdev); extern bool evergreen_is_display_hung(struct radeon_device *rdev); static void si_enable_gui_idle_interrupt(struct radeon_device *rdev, bool enable); +static void si_init_pg(struct radeon_device *rdev); +static void si_init_cg(struct radeon_device *rdev); static void si_fini_pg(struct radeon_device *rdev); static void si_fini_cg(struct radeon_device *rdev); static void si_rlc_stop(struct radeon_device *rdev); @@ -3722,6 +3724,106 @@ static void si_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask) evergreen_print_gpu_status_regs(rdev); } +static void si_set_clk_bypass_mode(struct radeon_device *rdev) +{ + u32 tmp, i; + + tmp = RREG32(CG_SPLL_FUNC_CNTL); + tmp |= SPLL_BYPASS_EN; + WREG32(CG_SPLL_FUNC_CNTL, tmp); + + tmp = RREG32(CG_SPLL_FUNC_CNTL_2); + tmp |= SPLL_CTLREQ_CHG; + WREG32(CG_SPLL_FUNC_CNTL_2, tmp); + + for (i = 0; i < rdev->usec_timeout; i++) { + if (RREG32(SPLL_STATUS) & SPLL_CHG_STATUS) + break; + udelay(1); + } + + tmp = RREG32(CG_SPLL_FUNC_CNTL_2); + tmp &= ~(SPLL_CTLREQ_CHG | SCLK_MUX_UPDATE); + WREG32(CG_SPLL_FUNC_CNTL_2, tmp); + + tmp = RREG32(MPLL_CNTL_MODE); + tmp &= ~MPLL_MCLK_SEL; + WREG32(MPLL_CNTL_MODE, tmp); +} + +static void si_spll_powerdown(struct radeon_device *rdev) +{ + u32 tmp; + + tmp = RREG32(SPLL_CNTL_MODE); + tmp |= SPLL_SW_DIR_CONTROL; + WREG32(SPLL_CNTL_MODE, tmp); + + tmp = RREG32(CG_SPLL_FUNC_CNTL); + tmp |= SPLL_RESET; + WREG32(CG_SPLL_FUNC_CNTL, tmp); + + tmp = RREG32(CG_SPLL_FUNC_CNTL); + tmp |= SPLL_SLEEP; + WREG32(CG_SPLL_FUNC_CNTL, tmp); + + tmp = RREG32(SPLL_CNTL_MODE); + tmp &= ~SPLL_SW_DIR_CONTROL; + WREG32(SPLL_CNTL_MODE, tmp); +} + +static void si_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 cg/pg */ + si_fini_pg(rdev); + si_fini_cg(rdev); + + /* Disable CP parsing/prefetching */ + WREG32(CP_ME_CNTL, CP_ME_HALT | CP_PFP_HALT | CP_CE_HALT); + /* dma0 */ + tmp = RREG32(DMA_RB_CNTL + DMA0_REGISTER_OFFSET); + tmp &= ~DMA_RB_ENABLE; + WREG32(DMA_RB_CNTL + DMA0_REGISTER_OFFSET, tmp); + /* dma1 */ + tmp = RREG32(DMA_RB_CNTL + DMA1_REGISTER_OFFSET); + tmp &= ~DMA_RB_ENABLE; + WREG32(DMA_RB_CNTL + DMA1_REGISTER_OFFSET, tmp); + /* XXX other engines? */ + + /* halt the rlc, disable cp internal ints */ + si_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"); + } + + /* set mclk/sclk to bypass */ + si_set_clk_bypass_mode(rdev); + /* powerdown spll */ + si_spll_powerdown(rdev); + /* disable BM */ + pci_clear_master(rdev->pdev); + /* 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 si_asic_reset(struct radeon_device *rdev) { u32 reset_mask; @@ -3731,10 +3833,17 @@ int si_asic_reset(struct radeon_device *rdev) if (reset_mask) r600_set_bios_scratch_engine_hung(rdev, true); + /* try soft reset */ si_gpu_soft_reset(rdev, reset_mask); reset_mask = si_gpu_check_soft_reset(rdev); + /* try pci config reset */ + if (reset_mask && radeon_hard_reset) + si_gpu_pci_config_reset(rdev); + + reset_mask = si_gpu_check_soft_reset(rdev); + if (!reset_mask) r600_set_bios_scratch_engine_hung(rdev, false); diff --git a/drivers/gpu/drm/radeon/sid.h b/drivers/gpu/drm/radeon/sid.h index b322acc..caa3e61 100644 --- a/drivers/gpu/drm/radeon/sid.h +++ b/drivers/gpu/drm/radeon/sid.h @@ -94,6 +94,8 @@ #define CG_SPLL_FUNC_CNTL_2 0x604 #define SCLK_MUX_SEL(x) ((x) << 0) #define SCLK_MUX_SEL_MASK (0x1ff << 0) +#define SPLL_CTLREQ_CHG (1 << 23) +#define SCLK_MUX_UPDATE (1 << 26) #define CG_SPLL_FUNC_CNTL_3 0x608 #define SPLL_FB_DIV(x) ((x) << 0) #define SPLL_FB_DIV_MASK (0x3ffffff << 0) @@ -101,7 +103,10 @@ #define SPLL_DITHEN (1 << 28) #define CG_SPLL_FUNC_CNTL_4 0x60c +#define SPLL_STATUS 0x614 +#define SPLL_CHG_STATUS (1 << 1) #define SPLL_CNTL_MODE 0x618 +#define SPLL_SW_DIR_CONTROL (1 << 0) # define SPLL_REFCLK_SEL(x) ((x) << 8) # define SPLL_REFCLK_SEL_MASK 0xFF00 @@ -559,6 +564,8 @@ # define MRDCK0_BYPASS (1 << 24) # define MRDCK1_BYPASS (1 << 25) +#define MPLL_CNTL_MODE 0x2bb0 +# define MPLL_MCLK_SEL (1 << 11) #define MPLL_FUNC_CNTL 0x2bb4 #define BWCTRL(x) ((x) << 20) #define BWCTRL_MASK (0xff << 20) -- 2.7.4