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SubjectRe: [PATCH v2 5/6] soc: qcom: rpmh powerdomain driver
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Hello Rajendra,

On 06/01/2018 01:48 AM, Rajendra Nayak wrote:
> On 05/26/2018 06:38 AM, David Collins wrote:
>>
>>> + [1] = &sdm845_mx,
>>> + [2] = &sdm845_mx_ao,
>>> + [3] = &sdm845_cx,
>>> + [4] = &sdm845_cx_ao,
>>> + [5] = &sdm845_lmx,
>>> + [6] = &sdm845_lcx,
>>> + [7] = &sdm845_gfx,
>>> + [8] = &sdm845_mss,
>>> +};
>>> +
>>> +static const struct rpmhpd_desc sdm845_desc = {
>>> + .rpmhpds = sdm845_rpmhpds,
>>> + .num_pds = ARRAY_SIZE(sdm845_rpmhpds),
>>> +};
>>> +
>>> +static const struct of_device_id rpmhpd_match_table[] = {
>>> + { .compatible = "qcom,sdm845-rpmhpd", .data = &sdm845_desc },
>>> + { }
>>> +};
>>> +MODULE_DEVICE_TABLE(of, rpmhpd_match_table);
>>> +
>>> +static int rpmhpd_send_corner(struct rpmhpd *pd, int state, unsigned int corner)
>>> +{
>>> + struct tcs_cmd cmd = {
>>> + .addr = pd->addr,
>>> + .data = corner,
>>> + };
>>> +
>>> + return rpmh_write(pd->dev, state, &cmd, 1);
>> This can be optimized by calling rpmh_write_async() whenever the corner
>> being sent is smaller than the last value sent. That way, no time is
>> wasted waiting for an ACK when decreasing voltage. Would you mind adding
>> the necessary check and previous request caching for this?
>
> is it safe to assume all sleep votes can be sent as async always? and only
> active votes could be sync/async depending on the last value sent?

Yes, rpmh_write_async() can always be used for RPMH_SLEEP_STATE and
RPMH_WAKE_ONLY_STATE. The rpmh_write() vs rpmh_write_async() distinction
only matters for RPMH_ACTIVE_ONLY_STATE.

Take care,
David

--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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