From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eugeni Dodonov Subject: [PATCH 7/7] drm/i915: enable RC6 workaround on Haswell Date: Fri, 29 Jun 2012 11:43:53 -0300 Message-ID: <1340981033-19461-8-git-send-email-eugeni.dodonov@intel.com> References: <1340981033-19461-1-git-send-email-eugeni.dodonov@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTP id 640B1A0B06 for ; Fri, 29 Jun 2012 07:42:12 -0700 (PDT) In-Reply-To: <1340981033-19461-1-git-send-email-eugeni.dodonov@intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: intel-gfx@lists.freedesktop.org Cc: Eugeni Dodonov List-Id: intel-gfx@lists.freedesktop.org For Haswell, on some of the early hardware revisions, it is possible to run into issues when RC6 state is enabled and when pipes change state. v2: add comment saying that this is for early revisions only. Signed-off-by: Eugeni Dodonov --- drivers/gpu/drm/i915/i915_reg.h | 5 +++++ drivers/gpu/drm/i915/intel_pm.c | 12 ++++++++++++ 2 files changed, 17 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 9d5bf06..793a172 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -4516,4 +4516,9 @@ #define SFUSE_STRAP_DDIC_DETECTED (1<<1) #define SFUSE_STRAP_DDID_DETECTED (1<<0) +#define WM_DBG 0x45280 +#define WM_DBG_DISALLOW_MULTIPLE_LP (1<<0) +#define WM_DBG_DISALLOW_MAXFIFO (1<<1) +#define WM_DBG_DISALLOW_SPRITE (1<<2) + #endif /* _I915_REG_H_ */ diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index d7ea540..8d2d0b9 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3468,6 +3468,18 @@ static void haswell_init_clock_gating(struct drm_device *dev) /* WaDisable4x2SubspanOptimization */ I915_WRITE(CACHE_MODE_1, _MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE)); + + /* Work-around rc6 issue */ + /* XXX: This is a workaround for early silicon revisions and should be + * removed later + */ + I915_WRITE(WM_DBG, + I915_READ(WM_DBG) | + WM_DBG_DISALLOW_MULTIPLE_LP | + WM_DBG_DISALLOW_SPRITE | + WM_DBG_DISALLOW_MAXFIFO + ); + } static void ivybridge_init_clock_gating(struct drm_device *dev) -- 1.7.11.1