[PATCH 2/7] drm/i915: use FPGA_DBG for the "unclaimed register" checks

[Paulo Zanoni <przanoni@gmail.com>]

From: Paulo Zanoni <paulo.r.zanoni@intel.com>

We plan to treat GEN7_ERR_INT as an interrupt, so use this register
for the checks inside I915_WRITE. This way we can have the best of
both worlds: the error message with a register address and the
interrupt.

V2: Split in 2 patches: one for the macro, one for changing the
register, as requested by Ben.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c |    8 ++++----
 drivers/gpu/drm/i915/i915_reg.h |    3 +++
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index ae0a55a..f47de4d 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1226,16 +1226,16 @@ ilk_dummy_write(struct drm_i915_private *dev_priv)
 
 #define UNCLAIMED_REG_CLEAR(dev_priv, reg) \
 	if (IS_HASWELL(dev_priv->dev) && \
-	    (I915_READ_NOTRACE(GEN7_ERR_INT) & ERR_INT_MMIO_UNCLAIMED)) { \
+	    (I915_READ_NOTRACE(FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) { \
 		DRM_ERROR("Unknown unclaimed register before writing to %x\n", reg); \
-		I915_WRITE_NOTRACE(GEN7_ERR_INT, ERR_INT_MMIO_UNCLAIMED); \
+		I915_WRITE_NOTRACE(FPGA_DBG, FPGA_DBG_RM_NOCLAIM); \
 	}
 
 #define UNCLAIMED_REG_CHECK(dev_priv, reg) \
 	if (IS_HASWELL(dev_priv->dev) && \
-	    (I915_READ_NOTRACE(GEN7_ERR_INT) & ERR_INT_MMIO_UNCLAIMED)) { \
+	    (I915_READ_NOTRACE(FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) { \
 		DRM_ERROR("Unclaimed write to %x\n", reg); \
-		writel(ERR_INT_MMIO_UNCLAIMED, dev_priv->regs + GEN7_ERR_INT);	\
+		I915_WRITE_NOTRACE(FPGA_DBG, FPGA_DBG_RM_NOCLAIM); \
 	}
 
 #define __i915_read(x, y) \
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 15c15a5..ee30fb9 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -515,6 +515,9 @@
 #define GEN7_ERR_INT	0x44040
 #define   ERR_INT_MMIO_UNCLAIMED (1<<13)
 
+#define FPGA_DBG		0x42300
+#define FPGA_DBG_RM_NOCLAIM	(1<<31)
+
 /* GM45+ chicken bits -- debug workaround bits that may be required
  * for various sorts of correct behavior.  The top 16 bits of each are
  * the enables for writing to the corresponding low bit.
-- 
1.7.10.4