accel/qaic: Implement quirk for SOC_HW_VERSION
authorJeffrey Hugo <quic_jhugo@quicinc.com>
Fri, 8 Dec 2023 16:31:01 +0000 (09:31 -0700)
committerJeffrey Hugo <quic_jhugo@quicinc.com>
Fri, 15 Dec 2023 17:40:37 +0000 (10:40 -0700)
commit4c8874c2a6512b9fe7285cab1a6910d9211a6cfb
tree8b003283522ed54068cd49e002e2c8b5dfb2fb91
parentc8b6f4ad2ff9c6d88cdeb9acf16d0c4a323dd499
accel/qaic: Implement quirk for SOC_HW_VERSION

The SOC_HW_VERSION register in the BHI space is not correctly initialized
by the device and in many cases contains uninitialized data. The register
could contain 0xFFFFFFFF which is a special value to indicate a link
error in PCIe, therefore if observed, we could incorrectly think the
device is down.

Intercept reads for this register, and provide the correct value - every
production instance would read 0x60110200 if the device was operating as
intended.

Fixes: a36bf7af868b ("accel/qaic: Add MHI controller")
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231208163101.1295769-3-quic_jhugo@quicinc.com
drivers/accel/qaic/mhi_controller.c