From: Mika Kuoppala Date: Tue, 15 Dec 2015 17:45:42 +0000 (+0200) Subject: drm/i915: Add non claimed mmio checking for vlv/chv X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8ac3e1bb76cc2e1585be3a5fa7551480e69487c8;p=linux-beck.git drm/i915: Add non claimed mmio checking for vlv/chv Imre mentioned that chv might also have capability to track unclaimed mmio accesses. Ville added that both chv and vlv has this capability and he had already made this way back [1]. Mimic what Ville's patch does but adapt on top of less frequent mmio accesses by omitting checking always on reg writes. This patch is untested as of now. v2: overflow handling and posting omitted (Ville) References: [1] http://lists.freedesktop.org/archives/intel-gfx/2013-May/027599.html Cc: Imre Deak Cc: Ville Syrjälä Reviewed-by: Ville Syrjälä Signed-off-by: Mika Kuoppala Link: http://patchwork.freedesktop.org/patch/msgid/1450201542-22918-1-git-send-email-mika.kuoppala@intel.com --- diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 7510d508e373..556a458d669e 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -1711,6 +1711,11 @@ enum skl_disp_power_wells { #define FPGA_DBG _MMIO(0x42300) #define FPGA_DBG_RM_NOCLAIM (1<<31) +#define CLAIM_ER _MMIO(VLV_DISPLAY_BASE + 0x2028) +#define CLAIM_ER_CLR (1 << 31) +#define CLAIM_ER_OVERFLOW (1 << 16) +#define CLAIM_ER_CTR_MASK 0xffff + #define DERRMR _MMIO(0x44050) /* Note that HBLANK events are reserved on bdw+ */ #define DERRMR_PIPEA_SCANLINE (1<<0) diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index bd0933cefe5d..d0973e08e7eb 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -328,13 +328,10 @@ static void intel_uncore_ellc_detect(struct drm_device *dev) } static bool -check_for_unclaimed_mmio(struct drm_i915_private *dev_priv) +fpga_check_for_unclaimed_mmio(struct drm_i915_private *dev_priv) { u32 dbg; - if (!HAS_FPGA_DBG_UNCLAIMED(dev_priv)) - return false; - dbg = __raw_i915_read32(dev_priv, FPGA_DBG); if (likely(!(dbg & FPGA_DBG_RM_NOCLAIM))) return false; @@ -344,6 +341,32 @@ check_for_unclaimed_mmio(struct drm_i915_private *dev_priv) return true; } +static bool +vlv_check_for_unclaimed_mmio(struct drm_i915_private *dev_priv) +{ + u32 cer; + + cer = __raw_i915_read32(dev_priv, CLAIM_ER); + if (likely(!(cer & (CLAIM_ER_OVERFLOW | CLAIM_ER_CTR_MASK)))) + return false; + + __raw_i915_write32(dev_priv, CLAIM_ER, CLAIM_ER_CLR); + + return true; +} + +static bool +check_for_unclaimed_mmio(struct drm_i915_private *dev_priv) +{ + if (HAS_FPGA_DBG_UNCLAIMED(dev_priv)) + return fpga_check_for_unclaimed_mmio(dev_priv); + + if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) + return vlv_check_for_unclaimed_mmio(dev_priv); + + return false; +} + static void __intel_uncore_early_sanitize(struct drm_device *dev, bool restore_forcewake) {