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drm/i915: add media well to VLV force wake routines v2 

We could split this out into a separate routine at some point as an
optimization.

v2: use FORCEWAKE_KERNEL (Ville)

Note: Ville mentioned in his review that he declines to be responsible
if this blows up due to the lack of "readback a register != FW_ACK,
but from the same cacheline" magic we have in other forcewake
implementations.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[danvet: Bikeshed overtly long lines according to checkpatch.pl. Nope,
this time around I didn't screw up printk message since I've left
those alone.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jesse Barnes 2013-03-08 10:45:57 -08:00 committed by Daniel Vetter
parent da6ecc5dec
commit ed5de3995f
2 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/i915/i915_reg.h
View File

@ -4148,6 +4148,8 @@
#define FORCEWAKE 0xA18C
#define FORCEWAKE_VLV 0x1300b0
#define FORCEWAKE_ACK_VLV 0x1300b4
#define FORCEWAKE_MEDIA_VLV 0x1300b8
#define FORCEWAKE_ACK_MEDIA_VLV 0x1300bc
#define FORCEWAKE_ACK_HSW 0x130044
#define FORCEWAKE_ACK 0x130090
#define VLV_GTLC_WAKE_CTRL 0x130090

14
drivers/gpu/drm/i915/intel_pm.c
View File

@ -4404,10 +4404,17 @@ static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");
I915_WRITE_NOTRACE(FORCEWAKE_VLV, _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
I915_WRITE_NOTRACE(FORCEWAKE_MEDIA_VLV,
_MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
if (wait_for_atomic((I915_READ_NOTRACE(FORCEWAKE_ACK_VLV) & FORCEWAKE_KERNEL),
FORCEWAKE_ACK_TIMEOUT_MS))
DRM_ERROR("Timed out waiting for forcewake to ack request.\n");
DRM_ERROR("Timed out waiting for GT to ack forcewake request.\n");
if (wait_for_atomic((I915_READ_NOTRACE(FORCEWAKE_ACK_MEDIA_VLV) &
FORCEWAKE_KERNEL),
FORCEWAKE_ACK_TIMEOUT_MS))
DRM_ERROR("Timed out waiting for media to ack forcewake request.\n");
__gen6_gt_wait_for_thread_c0(dev_priv);
}
@ -4415,8 +4422,9 @@ static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
static void vlv_force_wake_put(struct drm_i915_private *dev_priv)
{
I915_WRITE_NOTRACE(FORCEWAKE_VLV, _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
/* something from same cacheline, but !FORCEWAKE_VLV */
POSTING_READ(FORCEWAKE_ACK_VLV);
I915_WRITE_NOTRACE(FORCEWAKE_MEDIA_VLV,
_MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
/* The below doubles as a POSTING_READ */
gen6_gt_check_fifodbg(dev_priv);
}