[0/2] Qualcomm SDM845 SLPI DSP driver support

Message

Dylan Van Assche March 25, 2023, 1:21 p.m. UTC

The Qualcomm SDM845 SoC has a separate SLPI (Sensor Low Power Island)
DSP for sensors connected to the SoC which is responsible for exposing
sensors to userspace, power saving, and other features. 
While sensors are connected to GPIOs of the SoC, they cannot be used
because the hypervisor blocks direct access to the sensors, thus the 
DSP must be used to access any sensor on this SoC. The SLPI DSP uses a
GLink edge (dsps) to communicate with the host and has a FastRPC interface
to load files from the host filesystem such as sensor configuration files.
The FastRPC interface does not use regular FastRPC Compute Banks
but instead uses an allocated CMA region through which communication happens.

This set of patches adds support to drivers for the SLPI DSP:
1. Configure the permissions of assigned DSP memory through the hypervisor.
2. Allocate a remote heap when the FastRPC session ID is 0 instead of using 
a Compute Bank directly.
3. Add the SLPI remoteproc resource to the q6v5_pas driver to enable support
for it in the driver.
over QRTR.

DTS changes to enable the SLPI DSP in the SDM845 DTS and hardware
e.g. Oneplus 6 and SHIFTPHONES SHIFT6mq will be send once the driver changes
are applied.

Kind regards,
Dylan Van Assche

Dylan Van Assche (2):
  dt-bindings: remoteproc: qcom: adsp: add qcom,sdm845-slpi-pas
    compatible
  remoteproc: qcom: pas: add SDM845 SLPI resource

 .../bindings/remoteproc/qcom,adsp.yaml          |  3 +++
 drivers/remoteproc/qcom_q6v5_pas.c              | 17 +++++++++++++++++
 2 files changed, 20 insertions(+)

Comments

Krzysztof Kozlowski March 26, 2023, 8:51 a.m. UTC | #1

On 25/03/2023 14:21, Dylan Van Assche wrote:
> The Qualcomm SDM845 SoC has a separate SLPI (Sensor Low Power Island)
> DSP for sensors connected to the SoC which is responsible for exposing
> sensors to userspace, power saving, and other features. 
> While sensors are connected to GPIOs of the SoC, they cannot be used
> because the hypervisor blocks direct access to the sensors, thus the 
> DSP must be used to access any sensor on this SoC. The SLPI DSP uses a
> GLink edge (dsps) to communicate with the host and has a FastRPC interface
> to load files from the host filesystem such as sensor configuration files.
> The FastRPC interface does not use regular FastRPC Compute Banks
> but instead uses an allocated CMA region through which communication happens.
> 
> This set of patches adds support to drivers for the SLPI DSP:
> 1. Configure the permissions of assigned DSP memory through the hypervisor.
> 2. Allocate a remote heap when the FastRPC session ID is 0 instead of using 
> a Compute Bank directly.
> 3. Add the SLPI remoteproc resource to the q6v5_pas driver to enable support
> for it in the driver.
> over QRTR.
> 
> DTS changes to enable the SLPI DSP in the SDM845 DTS and hardware
> e.g. Oneplus 6 and SHIFTPHONES SHIFT6mq will be send once the driver changes
> are applied.

No, as we explained on IRC, we expect DTS to be sent the same time.

Best regards,
Krzysztof