From: Paulo Zanoni Date: Fri, 3 May 2013 20:23:45 +0000 (-0300) Subject: drm/i915: set FORCE_ARB_IDLE_PLANES workaround X-Git-Tag: firefly_0821_release~176^2~5752^2~105^2~61 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=90a8864320b2a9f91e5b5d561924a4bb70b90dcc;p=firefly-linux-kernel-4.4.55.git drm/i915: set FORCE_ARB_IDLE_PLANES workaround Commit 1544d9d57396d5c0c6b7644ed5ae1f4d6caad07a added a workaround inside haswell_init_clock_gating and mentioned it is "a workaround for early silicon revisions and should be removed later". This workaround is documented in bit 31 of PRI_CTL. I asked Arthur and he mentioned that setting FORCE_ARB_IDLE_PLANES replaces that workaround for the newer machines. So use the new one. Also notice that there's still another workaround for PRI_CTL that involves WM_DBG, but it's not the one we're reverting. And notice that we were previously setting WM_DBG_DISALLOW_MULTIPIPE_LP which disables the LP watermarks when more than one pipe is used, and we really don't want this because we need the LP watermarks if we want to reach deeper PC states. Signed-off-by: Paulo Zanoni Reviewed-by: Ville Syrjälä [danvet: Add a comment for the w/a name Ville dug out of Bspec.] Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index e4cf382f0b75..55caedba53d1 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -3711,6 +3711,9 @@ # define CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE (1 << 5) # define CHICKEN3_DGMG_DONE_FIX_DISABLE (1 << 2) +#define CHICKEN_PAR1_1 0x42080 +#define FORCE_ARB_IDLE_PLANES (1 << 14) + #define DISP_ARB_CTL 0x45000 #define DISP_TILE_SURFACE_SWIZZLING (1<<13) #define DISP_FBC_WM_DIS (1<<15) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 912ab4d8d722..e198f3881f9a 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4172,14 +4172,9 @@ static void haswell_init_clock_gating(struct drm_device *dev) /* WaSwitchSolVfFArbitrationPriority:hsw */ I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL); - /* 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); + /* WaRsPkgCStateDisplayPMReq:hsw */ + I915_WRITE(CHICKEN_PAR1_1, + I915_READ(CHICKEN_PAR1_1) | FORCE_ARB_IDLE_PLANES); lpt_init_clock_gating(dev); }