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authorAlex Deucher <alexdeucher@gmail.com>2010-08-27 18:25:25 -0400
committerDave Airlie <airlied@redhat.com>2010-10-06 11:38:08 +1000
commit724c80e1d630296d1324859e964d80d35007d83c (patch)
tree954e86447e1c259160d09c732ac0eb0289b2ec8b /drivers/gpu/drm/radeon/r520.c
parentb70d6bb3f67b2e2964abafb0117f1733f062cba5 (diff)
downloadblackbird-op-linux-724c80e1d630296d1324859e964d80d35007d83c.tar.gz
blackbird-op-linux-724c80e1d630296d1324859e964d80d35007d83c.zip
drm/radeon/kms: enable writeback (v2)
When writeback is enabled, the GPU shadows writes to certain registers into a buffer in memory. The driver can then read the values from the shadow rather than reading back from the register across the bus. Writeback can be disabled by setting the no_wb module param to 1. On r6xx/r7xx/evergreen, the following registers are shadowed: - CP scratch registers - CP read pointer - IH write pointer On r1xx-rr5xx, the following registers are shadowed: - CP scratch registers - CP read pointer v2: - Combine wb patches for r6xx-evergreen and r1xx-r5xx - Writeback is disabled on AGP boards since it tends to be unreliable on AGP using the gart. - Check radeon_wb_init return values properly. Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/r520.c')
-rw-r--r--drivers/gpu/drm/radeon/r520.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/gpu/drm/radeon/r520.c b/drivers/gpu/drm/radeon/r520.c
index 1458dee902dd..3c8677f9e385 100644
--- a/drivers/gpu/drm/radeon/r520.c
+++ b/drivers/gpu/drm/radeon/r520.c
@@ -181,6 +181,12 @@ static int r520_startup(struct radeon_device *rdev)
if (r)
return r;
}
+
+ /* allocate wb buffer */
+ r = radeon_wb_init(rdev);
+ if (r)
+ return r;
+
/* Enable IRQ */
rs600_irq_set(rdev);
rdev->config.r300.hdp_cntl = RREG32(RADEON_HOST_PATH_CNTL);
@@ -190,9 +196,6 @@ static int r520_startup(struct radeon_device *rdev)
dev_err(rdev->dev, "failled initializing CP (%d).\n", r);
return r;
}
- r = r100_wb_init(rdev);
- if (r)
- dev_err(rdev->dev, "failled initializing WB (%d).\n", r);
r = r100_ib_init(rdev);
if (r) {
dev_err(rdev->dev, "failled initializing IB (%d).\n", r);
@@ -295,7 +298,7 @@ int r520_init(struct radeon_device *rdev)
/* Somethings want wront with the accel init stop accel */
dev_err(rdev->dev, "Disabling GPU acceleration\n");
r100_cp_fini(rdev);
- r100_wb_fini(rdev);
+ radeon_wb_fini(rdev);
r100_ib_fini(rdev);
radeon_irq_kms_fini(rdev);
rv370_pcie_gart_fini(rdev);
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