From: Sean Paul Date: Mon, 13 Feb 2012 18:14:51 +0000 (-0500) Subject: drm/i915: Don't lock panel registers when downclocking X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8ac5a6d5b56700c006baa94272b63f2d3fdf6b06;p=linux-beck.git drm/i915: Don't lock panel registers when downclocking This patch replaces the locking from the downclock routines with an assert to ensure the registers are indeed unlocked. Without this patch, pre-SNB devices would lock the registers when downclocking which would cause a WARNING on suspend/resume with downclocking enabled. Note: To hit this bug, you need to have lvds downclocking enabled. Signed-off-by: Sean Paul Acked-by: Jesse Barnes Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index db7ccbbb97c5..ba287cab45f0 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -7006,9 +7006,7 @@ static void intel_increase_pllclock(struct drm_crtc *crtc) if (!HAS_PIPE_CXSR(dev) && (dpll & DISPLAY_RATE_SELECT_FPA1)) { DRM_DEBUG_DRIVER("upclocking LVDS\n"); - /* Unlock panel regs */ - I915_WRITE(PP_CONTROL, - I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS); + assert_panel_unlocked(dev_priv, pipe); dpll &= ~DISPLAY_RATE_SELECT_FPA1; I915_WRITE(dpll_reg, dpll); @@ -7017,9 +7015,6 @@ static void intel_increase_pllclock(struct drm_crtc *crtc) dpll = I915_READ(dpll_reg); if (dpll & DISPLAY_RATE_SELECT_FPA1) DRM_DEBUG_DRIVER("failed to upclock LVDS!\n"); - - /* ...and lock them again */ - I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) & 0x3); } /* Schedule downclock */ @@ -7049,9 +7044,7 @@ static void intel_decrease_pllclock(struct drm_crtc *crtc) if (!HAS_PIPE_CXSR(dev) && intel_crtc->lowfreq_avail) { DRM_DEBUG_DRIVER("downclocking LVDS\n"); - /* Unlock panel regs */ - I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) | - PANEL_UNLOCK_REGS); + assert_panel_unlocked(dev_priv, pipe); dpll |= DISPLAY_RATE_SELECT_FPA1; I915_WRITE(dpll_reg, dpll); @@ -7059,9 +7052,6 @@ static void intel_decrease_pllclock(struct drm_crtc *crtc) dpll = I915_READ(dpll_reg); if (!(dpll & DISPLAY_RATE_SELECT_FPA1)) DRM_DEBUG_DRIVER("failed to downclock LVDS!\n"); - - /* ...and lock them again */ - I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) & 0x3); } }