Verified that it works as intended on 5.7.10. Thank you very much :) Feel free to add my tested-by ...

Am 23.08.20 um 21:09 schrieb Christian Gmeiner:

It looks like that this GPU core triggers an abort when reading VIVS_HI_CHIP_PRODUCT_ID and/or VIVS_HI_CHIP_ECO_ID.

I looked at different versions of Vivante's kernel driver and did not found anything about this issue or what feature flag can be used. So go the simplest route and do not read these two registers on the affected GPU core.

Signed-off-by: Christian Gmeiner christian.gmeiner@gmail.com Reported-by: Josua Mayer josua.mayer@jm0.eu Fixes: 815e45bbd4d3 ("drm/etnaviv: determine product, customer and eco id") Cc: stable@vger.kernel.org

---

Changelog:

V2:

• use correct register for conditional reads.

---

drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c index d5a4cd85a0f6..c6404b8d067f 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c @@ -337,9 +337,16 @@ static void etnaviv_hw_identify(struct etnaviv_gpu *gpu) gpu->identity.model = gpu_read(gpu, VIVS_HI_CHIP_MODEL); gpu->identity.revision = gpu_read(gpu, VIVS_HI_CHIP_REV);

• gpu->identity.product_id = gpu_read(gpu, VIVS_HI_CHIP_PRODUCT_ID);
  

  gpu->identity.customer_id = gpu_read(gpu, VIVS_HI_CHIP_CUSTOMER_ID);

• gpu->identity.eco_id = gpu_read(gpu, VIVS_HI_CHIP_ECO_ID);
  

• /*
  

•  * Reading these two registers on GC600 rev 0x19 result in a
  

•  * unhandled fault: external abort on non-linefetch
  

•  */
  

• if (!etnaviv_is_model_rev(gpu, GC600, 0x19)) {
  

• 	gpu->identity.product_id = gpu_read(gpu, VIVS_HI_CHIP_PRODUCT_ID);
  

• 	gpu->identity.eco_id = gpu_read(gpu, VIVS_HI_CHIP_ECO_ID);
  

• }
  

/* * !!!! HACK ALERT !!!!