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>

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index c628414..d1e9d63 100644 (file)
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -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) { \
-               dev_priv->uncore.funcs.force_wake_get(dev_priv, \
-                                                       FORCEWAKE_ALL); \
-       } \
-       __raw_i915_write##x(dev_priv, reg, val); \
-       if (__needs_put) { \
-               dev_priv->uncore.funcs.force_wake_put(dev_priv, \
-                                                       FORCEWAKE_ALL); \
+       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 (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; \
 }