From 73bbf6bd907906dcbdc78f3af38a722c0fe498d8 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 21 Nov 2014 21:54:25 +0200 Subject: [PATCH] drm/i915: Fix gen4 GPU reset MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit On pre-ctg the reset bit directly controls the reset signal. We must assert it for >=20usec and then deassert it. Bit 1 is a RO status bit which should also go down when the reset is no longer asserted. Tested-by: Kenneth Graunke Signed-off-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_uncore.c | 41 ++++++++++------------------- 2 files changed, 15 insertions(+), 27 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 3102907a96a7..ff1e36f669a2 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -83,6 +83,7 @@ #define GRDOM_RENDER (1<<2) #define GRDOM_MEDIA (3<<2) #define GRDOM_MASK (3<<2) +#define GRDOM_RESET_STATUS (1<<1) #define GRDOM_RESET_ENABLE (1<<0) #define ILK_GDSR 0x2ca4 /* MCHBAR offset */ diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index f0230b0e8e11..c333d9c37f11 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -1349,37 +1349,24 @@ static int i965_reset_complete(struct drm_device *dev) { u8 gdrst; pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst); - return (gdrst & GRDOM_RESET_ENABLE) == 0; + return (gdrst & GRDOM_RESET_STATUS) == 0; } static int i965_do_reset(struct drm_device *dev) { - int ret; - - /* FIXME: i965g/gm need a display save/restore for gpu reset. */ - return -ENODEV; - - /* - * Set the domains we want to reset (GRDOM/bits 2 and 3) as - * well as the reset bit (GR/bit 0). Setting the GR bit - * triggers the reset; when done, the hardware will clear it. - */ - pci_write_config_byte(dev->pdev, I965_GDRST, - GRDOM_RENDER | GRDOM_RESET_ENABLE); - ret = wait_for(i965_reset_complete(dev), 500); - if (ret) - return ret; - - pci_write_config_byte(dev->pdev, I965_GDRST, - GRDOM_MEDIA | GRDOM_RESET_ENABLE); - - ret = wait_for(i965_reset_complete(dev), 500); - if (ret) - return ret; - + /* assert reset for at least 20 usec */ + pci_write_config_byte(dev->pdev, I965_GDRST, GRDOM_RESET_ENABLE); + udelay(20); pci_write_config_byte(dev->pdev, I965_GDRST, 0); - return 0; + return wait_for(i965_reset_complete(dev), 500); +} + +static int g4x_reset_complete(struct drm_device *dev) +{ + u8 gdrst; + pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst); + return (gdrst & GRDOM_RESET_ENABLE) == 0; } static int g4x_do_reset(struct drm_device *dev) @@ -1389,7 +1376,7 @@ static int g4x_do_reset(struct drm_device *dev) pci_write_config_byte(dev->pdev, I965_GDRST, GRDOM_RENDER | GRDOM_RESET_ENABLE); - ret = wait_for(i965_reset_complete(dev), 500); + ret = wait_for(g4x_reset_complete(dev), 500); if (ret) return ret; @@ -1399,7 +1386,7 @@ static int g4x_do_reset(struct drm_device *dev) pci_write_config_byte(dev->pdev, I965_GDRST, GRDOM_MEDIA | GRDOM_RESET_ENABLE); - ret = wait_for(i965_reset_complete(dev), 500); + ret = wait_for(g4x_reset_complete(dev), 500); if (ret) return ret; -- 2.39.5