On Wed, Jan 22, 2020 at 11:19 PM Sharat Masetty smasetty@codeaurora.org wrote:
This patch adds support for enabling Graphics Bus Interface(GBIF) used in multiple A6xx series chipets. Also makes changes to the PDC/RSC sequencing specifically required for A618. This is needed for proper interfacing with RPMH.
Signed-off-by: Sharat Masetty smasetty@codeaurora.org
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c index dc8ec2c..2ac9a51 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c @@ -378,6 +378,18 @@ static int a6xx_hw_init(struct msm_gpu *gpu) struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu); int ret;
/** During a previous slumber, GBIF halt is asserted to ensure* no further transaction can go through GPU before GPU* headswitch is turned off.** This halt is deasserted once headswitch goes off but* incase headswitch doesn't goes off clear GBIF halt* here to ensure GPU wake-up doesn't fail because of* halted GPU transactions.*/gpu_write(gpu, REG_A6XX_GBIF_HALT, 0x0);/* Make sure the GMU keeps the GPU on while we set it up */ a6xx_gmu_set_oob(&a6xx_gpu->gmu, GMU_OOB_GPU_SET);
So I already brought this up on #freedreno but figured I'd follow up on the list.
With linus/master, I'm seeing hard crashes (into usb crash mode) with the db845c, which I isolated down to this patch, and then to the chunk above.
Dropping the gpu_write line above gets things booting again for me.
Let me know if there are any follow on patches I can help validate.
thanks -john