From: Ville Syrjälä Date: Tue, 25 Feb 2014 13:13:40 +0000 (+0200) Subject: drm/i915: Enable interrupt-based AGPBUSY# enable on 85x X-Git-Tag: next-20140530~66^2~7 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9d9c5847eaa4c691a2070f193b493370c8c71e4d;p=karo-tx-linux.git drm/i915: Enable interrupt-based AGPBUSY# enable on 85x 85x also has a similar AGPBUSY# bit as gen3. Enable it to make sure vblank interrupts don't get dealyed during C3 state. There's also another bit which controls whether AGPBUSY# is asserted based on pending cacheable cycles and interrupts, or just based on pending commands in the ring and interrupts. Select the cacheable cycles mode since that seems to be the new way of doing things in 85x, and it does give slightly better C3 residency numbers with glxgears running. Signed-off-by: Ville Syrjälä Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index acb00858f657..242df99f8b1a 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -1298,6 +1298,10 @@ enum punit_power_well { #define MI_ARB_DISPLAY_PRIORITY_A_B (0 << 0) /* display A > display B */ #define MI_ARB_DISPLAY_PRIORITY_B_A (1 << 0) /* display B > display A */ +#define MI_STATE 0x020e4 /* gen2 only */ +#define MI_AGPBUSY_INT_EN (1 << 1) /* 85x only */ +#define MI_AGPBUSY_830_MODE (1 << 0) /* 85x only */ + #define CACHE_MODE_0 0x02120 /* 915+ only */ #define CM0_PIPELINED_RENDER_FLUSH_DISABLE (1<<8) #define CM0_IZ_OPT_DISABLE (1<<6) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index df5181503e59..16840f3d4e52 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -5707,6 +5707,10 @@ static void i85x_init_clock_gating(struct drm_device *dev) struct drm_i915_private *dev_priv = dev->dev_private; I915_WRITE(RENCLK_GATE_D1, SV_CLOCK_GATE_DISABLE); + + /* interrupts should cause a wake up from C3 */ + I915_WRITE(MI_STATE, _MASKED_BIT_ENABLE(MI_AGPBUSY_INT_EN) | + _MASKED_BIT_DISABLE(MI_AGPBUSY_830_MODE)); } static void i830_init_clock_gating(struct drm_device *dev)