From: David Collins <collinsd@codeaurora.org>
To: Rajendra Nayak <rnayak@codeaurora.org>,
viresh.kumar@linaro.org, sboyd@kernel.org, andy.gross@linaro.org,
ulf.hansson@linaro.org
Cc: devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org, Lina Iyer <ilina@codeaurora.org>
Subject: Re: [PATCH v2 5/6] soc: qcom: rpmh powerdomain driver
Date: Fri, 1 Jun 2018 12:19:42 -0700 [thread overview]
Message-ID: <6075eeb8-ffb4-e7af-03a8-deed0444cb8c@codeaurora.org> (raw)
In-Reply-To: <6817acaf-9a68-5cd5-4dd0-ebe12a9aa057@codeaurora.org>
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
next prev parent reply other threads:[~2018-06-01 19:19 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-25 10:01 [PATCH v2 0/6] Add powerdomain driver for corners on msm8996/sdm845 Rajendra Nayak
2018-05-25 10:01 ` [PATCH v2 1/6] soc: qcom: rpmpd: Add a powerdomain driver to model corners Rajendra Nayak
2018-05-30 9:17 ` Ulf Hansson
2018-05-30 10:14 ` Rajendra Nayak
2018-05-30 12:44 ` Ulf Hansson
2018-05-31 4:20 ` Rajendra Nayak
2018-05-31 11:09 ` Ulf Hansson
2018-05-30 18:27 ` David Collins
2018-05-31 3:53 ` Rajendra Nayak
2018-05-31 3:27 ` Rob Herring
2018-05-31 4:14 ` Rajendra Nayak
2018-05-25 10:01 ` [PATCH v2 2/6] dt-bindings: opp: Introduce qcom-opp bindings Rajendra Nayak
2018-05-25 22:33 ` David Collins
2018-05-29 9:49 ` Rajendra Nayak
2018-05-25 10:01 ` [PATCH v2 3/6] soc: qcom: rpmpd: Add support for get/set performance state Rajendra Nayak
2018-05-25 10:01 ` [PATCH v2 4/6] arm64: dts: msm8996: Add rpmpd device node Rajendra Nayak
2018-05-25 10:01 ` [PATCH v2 5/6] soc: qcom: rpmh powerdomain driver Rajendra Nayak
2018-05-26 1:08 ` David Collins
2018-05-29 10:19 ` Rajendra Nayak
2018-05-29 19:03 ` David Collins
2018-05-30 8:55 ` Rajendra Nayak
2018-05-30 9:44 ` Viresh Kumar
2018-05-30 10:07 ` Rajendra Nayak
2018-06-01 8:48 ` Rajendra Nayak
2018-06-01 19:19 ` David Collins [this message]
2018-06-13 18:29 ` Lina Iyer
2018-05-31 3:31 ` Rob Herring
2018-05-31 4:15 ` Rajendra Nayak
2018-05-25 10:01 ` [PATCH v2 6/6] soc: qcom: rpmpd/rpmhpd: Add a max vote on all corners at init Rajendra Nayak
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