5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Richard Thier <u9vata@xxxxxxxxx> commit 29ffeb73b216ce3eff10229eb077cf9b7812119d upstream. num_gb_pipes was set to a wrong value using r420_pipe_config This have lead to HyperZ glitches on fast Z clearing. Closes: https://bugs.freedesktop.org/show_bug.cgi?id=110897 Reviewed-by: Marek Olšák <marek.olsak@xxxxxxx> Signed-off-by: Richard Thier <u9vata@xxxxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> (cherry picked from commit 044e59a85c4d84e3c8d004c486e5c479640563a6) Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/radeon/r300.c | 3 ++- drivers/gpu/drm/radeon/radeon_asic.h | 1 + drivers/gpu/drm/radeon/rs400.c | 18 ++++++++++++++++-- 3 files changed, 19 insertions(+), 3 deletions(-) --- a/drivers/gpu/drm/radeon/r300.c +++ b/drivers/gpu/drm/radeon/r300.c @@ -359,7 +359,8 @@ int r300_mc_wait_for_idle(struct radeon_ return -1; } -static void r300_gpu_init(struct radeon_device *rdev) +/* rs400_gpu_init also calls this! */ +void r300_gpu_init(struct radeon_device *rdev) { uint32_t gb_tile_config, tmp; --- a/drivers/gpu/drm/radeon/radeon_asic.h +++ b/drivers/gpu/drm/radeon/radeon_asic.h @@ -165,6 +165,7 @@ void r200_set_safe_registers(struct rade */ extern int r300_init(struct radeon_device *rdev); extern void r300_fini(struct radeon_device *rdev); +extern void r300_gpu_init(struct radeon_device *rdev); extern int r300_suspend(struct radeon_device *rdev); extern int r300_resume(struct radeon_device *rdev); extern int r300_asic_reset(struct radeon_device *rdev, bool hard); --- a/drivers/gpu/drm/radeon/rs400.c +++ b/drivers/gpu/drm/radeon/rs400.c @@ -255,8 +255,22 @@ int rs400_mc_wait_for_idle(struct radeon static void rs400_gpu_init(struct radeon_device *rdev) { - /* FIXME: is this correct ? */ - r420_pipes_init(rdev); + /* Earlier code was calling r420_pipes_init and then + * rs400_mc_wait_for_idle(rdev). The problem is that + * at least on my Mobility Radeon Xpress 200M RC410 card + * that ends up in this code path ends up num_gb_pipes == 3 + * while the card seems to have only one pipe. With the + * r420 pipe initialization method. + * + * Problems shown up as HyperZ glitches, see: + * https://bugs.freedesktop.org/show_bug.cgi?id=110897 + * + * Delegating initialization to r300 code seems to work + * and results in proper pipe numbers. The rs400 cards + * are said to be not r400, but r300 kind of cards. + */ + r300_gpu_init(rdev); + if (rs400_mc_wait_for_idle(rdev)) { pr_warn("rs400: Failed to wait MC idle while programming pipes. Bad things might happen. %08x\n", RREG32(RADEON_MC_STATUS));
