agp/intel: Flush the chipset write buffers when changing GTT base

Flush the chipset write buffers before and after adjusting the GTT base
register, just in case. We only modify this value upon initialisation
(boot and resume) so there should be no outstanding writes, however
there are always those persistent PGTBL_ER that keep getting reported
upon resume.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

2 files changed, 11 insertions, 0 deletions

diff --git a/drivers/char/agp/intel-agp.h b/drivers/char/agp/intel-agp.h
index 010e3de..c195bfe 100644
--- a/drivers/char/agp/intel-agp.h
+++ b/drivers/char/agp/intel-agp.h
@@ -94,6 +94,8 @@
 #define G4x_GMCH_SIZE_VT_1_5M	(0xa << 8)
 #define G4x_GMCH_SIZE_VT_2M	(0xc << 8)
 
+#define GFX_FLSH_CNTL		0x2170 /* 915+ */
+
 #define I810_DRAM_CTL		0x3000
 #define I810_DRAM_ROW_0		0x00000001
 #define I810_DRAM_ROW_0_SDRAM	0x00000001
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 356f73e..da81618 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -814,6 +814,12 @@ static bool intel_enable_gtt(void)
 		}
 	}
 
+	/* On the resume path we may be adjusting the PGTBL value, so
+	 * be paranoid and flush all chipset write buffers...
+	 */
+	if (INTEL_GTT_GEN >= 3)
+		writel(0, intel_private.registers+GFX_FLSH_CNTL);
+
 	reg = intel_private.registers+I810_PGETBL_CTL;
 	writel(intel_private.PGETBL_save, reg);
 	if (HAS_PGTBL_EN && (readl(reg) & I810_PGETBL_ENABLED) == 0) {
@@ -823,6 +829,9 @@ static bool intel_enable_gtt(void)
 		return false;
 	}
 
+	if (INTEL_GTT_GEN >= 3)
+		writel(0, intel_private.registers+GFX_FLSH_CNTL);
+
 	return true;
 }