[PATCH 56/89] drm/i915: Gen9 shadowed registers

Damien Lespiau
2014-09-04T11:28:51Z

From: Zhe Wang <zhe1.wang@intel.com>

For MMIO registers which are shadowed, force wake is not needed to
write to these registers.

v2: Rebase on top of nightly (Damien)

Signed-off-by: Zhe Wang <zhe1.wang@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
---
drivers/gpu/drm/i915/intel_uncore.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index f289f4f..ce1214b 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -1028,13 +1028,37 @@ chv_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace)
REG_WRITE_FOOTER; \
}

+static const u32 gen9_shadowed_regs[] = {
+ FORCEWAKE_MEDIA_GEN9,
+ FORCEWAKE_RENDER_GEN9,
+ FORCEWAKE_BLITTER_GEN9,
+ GEN6_RPNSWREQ,
+ GEN6_RC_VIDEO_FREQ,
+ RING_TAIL(RENDER_RING_BASE),
+ RING_TAIL(GEN6_BSD_RING_BASE),
+ RING_TAIL(VEBOX_RING_BASE),
+ RING_TAIL(BLT_RING_BASE),
+ /* TODO: Other registers are not yet used */
+};
+
+static bool is_gen9_shadowed(struct drm_i915_private *dev_priv, u32 reg)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(gen9_shadowed_regs); i++)
+ if (reg == gen9_shadowed_regs[i])
+ return true;
+
+ return false;
+}
+
#define __gen9_write(x) \
static void \
gen9_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, \
bool trace) { \
REG_WRITE_HEADER; \
if (!NEEDS_FORCE_WAKE((dev_priv), (reg)) || \
- FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg)) { \
+ FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg) || \
+ is_gen9_shadowed(dev_priv, reg)) { \
__raw_i915_write##x(dev_priv, reg, val); \
} else { \
unsigned fwengine = 0; \
--
1.8.3.1