From 724c80e1d630296d1324859e964d80d35007d83c Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Fri, 27 Aug 2010 18:25:25 -0400 Subject: 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 Signed-off-by: Dave Airlie --- drivers/gpu/drm/radeon/rs400.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) (limited to 'drivers/gpu/drm/radeon/rs400.c') diff --git a/drivers/gpu/drm/radeon/rs400.c b/drivers/gpu/drm/radeon/rs400.c index ae2b76b9a38..f683e51a2a0 100644 --- a/drivers/gpu/drm/radeon/rs400.c +++ b/drivers/gpu/drm/radeon/rs400.c @@ -397,6 +397,12 @@ static int rs400_startup(struct radeon_device *rdev) r = rs400_gart_enable(rdev); if (r) return r; + + /* allocate wb buffer */ + r = radeon_wb_init(rdev); + if (r) + return r; + /* Enable IRQ */ r100_irq_set(rdev); rdev->config.r300.hdp_cntl = RREG32(RADEON_HOST_PATH_CNTL); @@ -406,9 +412,6 @@ static int rs400_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); @@ -443,7 +446,7 @@ int rs400_resume(struct radeon_device *rdev) int rs400_suspend(struct radeon_device *rdev) { r100_cp_disable(rdev); - r100_wb_disable(rdev); + radeon_wb_disable(rdev); r100_irq_disable(rdev); rs400_gart_disable(rdev); return 0; @@ -452,7 +455,7 @@ int rs400_suspend(struct radeon_device *rdev) void rs400_fini(struct radeon_device *rdev) { r100_cp_fini(rdev); - r100_wb_fini(rdev); + radeon_wb_fini(rdev); r100_ib_fini(rdev); radeon_gem_fini(rdev); rs400_gart_fini(rdev); @@ -526,7 +529,7 @@ int rs400_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); rs400_gart_fini(rdev); radeon_irq_kms_fini(rdev); -- cgit v1.2.3-70-g09d2