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drm/i915: Fix forcewake counts for gen8 

Sometimes generic driver code gets forcewake explicitly by
gen6_gt_force_wake_get(), which check forcewake_count before accessing
hardware. However the register access with gen8_write function access
low level hw accessors directly, ignoring the forcewake_count. This
leads to nested forcewake get from hardware, in ring init and possibly
elsewhere, causing forcewake ack clear errors and/or hangs.

Fix this by checking the forcewake count also in gen8_write

v2: Read side doesn't care about shadowed registers,
    Remove __needs_put funkiness from gen8_write. (Ville)
    Improved commit message.

References: https://bugs.freedesktop.org/show_bug.cgi?id=74007
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Ben Widawsky <benjamin.widawsky@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Mika Kuoppala 2014-02-18 19:10:24 +02:00 committed by Daniel Vetter
parent 93c73e8c6e
commit e9dbd2b202
1 changed files with 10 additions and 9 deletions
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9
drivers/gpu/drm/i915/intel_uncore.c
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@ -634,16 +634,17 @@ static bool is_gen8_shadowed(struct drm_i915_private *dev_priv, u32 reg)
#define __gen8_write(x) \
static void \
gen8_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
bool __needs_put = reg < 0x40000 && !is_gen8_shadowed(dev_priv, reg); \
REG_WRITE_HEADER; \
if (__needs_put) { \
if (reg < 0x40000 && !is_gen8_shadowed(dev_priv, reg)) { \
if (dev_priv->uncore.forcewake_count == 0) \
dev_priv->uncore.funcs.force_wake_get(dev_priv, \
FORCEWAKE_ALL); \
} \
__raw_i915_write##x(dev_priv, reg, val); \
if (__needs_put) { \
if (dev_priv->uncore.forcewake_count == 0) \
dev_priv->uncore.funcs.force_wake_put(dev_priv, \
FORCEWAKE_ALL); \
} else { \
__raw_i915_write##x(dev_priv, reg, val); \
} \
REG_WRITE_FOOTER; \
}