On Fri, Jan 13, 2017 at 11:12:41AM -0600, Andy Gross wrote:
> On Mon, Nov 28, 2016 at 12:28:35PM -0700, Jordan Crouse wrote:
> > Add an interface to trigger the remote processor to reinitialize the GPU
> > zap shader on power-up.
> >
> > Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
> > ---
>
> <snip>
>
> > +int __qcom_scm_gpu_zap_resume(struct device *dev)
> > +{
> > + struct qcom_scm_desc desc = {0};
> > + struct arm_smccc_res res;
> > + int ret;
> > +
> > + desc.args[0] = 0;
This is an opcode to force the state to resume.
QCOM_SCM_BOOT_SET_STATE_RESUME perhaps? Or something similar but shorter.
> > + desc.args[1] = 13;
This is the same as the SCM id of the GPU but I think that is a coincidence.
We've always used it to identify the GPU in this call.
QCOM_SCM_BOOT_SET_STATE_GPU would be fine here - or something similar.
> Can I get a define here for these two? Or maybe a comment on what these values
> are?
>
> > + desc.arginfo = QCOM_SCM_ARGS(2);
> > +
> > + ret = qcom_scm_call(dev, QCOM_SCM_SVC_BOOT, 0x0A, &desc, &res);
>
> Same with the 0xA. We usually throw a #define in for the command definitions.
0x0A sets the state of the device - for us it is always 0 (resume) and always
the GPU.
#define QCOM_SCM_BOOT_SET_STATE 0x0A
> Otherwise this all looks fine. If you can get back to me with either the values
> or a new patch I can include this in the next pull.
I'll make the changes and start the song and dance, but you'll no doubt be
faster than I.
Jordan
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