At least on an IBM Power 720, this check passes, but several piglit tests will reliably trigger GPU resets due to the ring buffer pointers not being updated. There's probably a better way to limit this to just affected machines though.
Signed-off-by: Adam Jackson ajax@redhat.com --- drivers/gpu/drm/radeon/r600_cp.c | 7 +++++++ drivers/gpu/drm/radeon/radeon_cp.c | 7 +++++++ drivers/gpu/drm/radeon/radeon_device.c | 4 ++-- drivers/gpu/drm/radeon/radeon_drv.c | 2 +- 4 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/radeon/r600_cp.c b/drivers/gpu/drm/radeon/r600_cp.c index 1c51c08..ef28532 100644 --- a/drivers/gpu/drm/radeon/r600_cp.c +++ b/drivers/gpu/drm/radeon/r600_cp.c @@ -552,6 +552,13 @@ static void r600_test_writeback(drm_radeon_private_t *dev_priv) dev_priv->writeback_works = 0; DRM_INFO("writeback test failed\n"); } +#if defined(__ppc__) || defined(__ppc64__) + /* the test might succeed on ppc, but it's usually not reliable */ + if (radeon_no_wb == -1) { + radeon_no_wb = 1; + DRM_INFO("not trusting writeback test due to arch quirk\n"); + } +#endif if (radeon_no_wb == 1) { dev_priv->writeback_works = 0; DRM_INFO("writeback forced off\n"); diff --git a/drivers/gpu/drm/radeon/radeon_cp.c b/drivers/gpu/drm/radeon/radeon_cp.c index efc4f64..a967b33 100644 --- a/drivers/gpu/drm/radeon/radeon_cp.c +++ b/drivers/gpu/drm/radeon/radeon_cp.c @@ -892,6 +892,13 @@ static void radeon_test_writeback(drm_radeon_private_t * dev_priv) dev_priv->writeback_works = 0; DRM_INFO("writeback test failed\n"); } +#if defined(__ppc__) || defined(__ppc64__) + /* the test might succeed on ppc, but it's usually not reliable */ + if (radeon_no_wb == -1) { + radeon_no_wb = 1; + DRM_INFO("not trusting writeback test due to arch quirk\n"); + } +#endif if (radeon_no_wb == 1) { dev_priv->writeback_works = 0; DRM_INFO("writeback forced off\n"); diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c index 1899738..524046e 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -322,8 +322,8 @@ int radeon_wb_init(struct radeon_device *rdev) /* disable event_write fences */ rdev->wb.use_event = false; /* disabled via module param */ - if (radeon_no_wb == 1) { - rdev->wb.enabled = false; + if (radeon_no_wb != -1) { + rdev->wb.enabled = !!radeon_no_wb; } else { if (rdev->flags & RADEON_IS_AGP) { /* often unreliable on AGP */ diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c index 094e7e5..04809d4 100644 --- a/drivers/gpu/drm/radeon/radeon_drv.c +++ b/drivers/gpu/drm/radeon/radeon_drv.c @@ -146,7 +146,7 @@ static inline void radeon_register_atpx_handler(void) {} static inline void radeon_unregister_atpx_handler(void) {} #endif
-int radeon_no_wb; +int radeon_no_wb = -1; int radeon_modeset = -1; int radeon_dynclks = -1; int radeon_r4xx_atom = 0;