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From: Stephen Boyd <swboyd@chromium.org>
To: Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
	Rajendra Nayak <rnayak@codeaurora.org>,
	Ulf Hansson <ulf.hansson@linaro.org>
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RESEND PATCH 2/2] soc: qcom: rpmhpd: Make power_on actually enable the domain
Date: Thu, 8 Jul 2021 00:23:16 +0000	[thread overview]
Message-ID: <CAE-0n502u+7CNhA5_kMfc-CVvpSzdGOeputT6nxW8BvtyVBeRQ@mail.gmail.com> (raw)
In-Reply-To: <20210703025449.2687201-1-bjorn.andersson@linaro.org>

Quoting Bjorn Andersson (2021-07-02 19:54:49)
> The general expectation is that powering on a power-domain should make
> the power domain deliver some power, and if a specific performace state
> is needed further requests has to be made.
>
> But in contrast with other power-domain implementations (e.g. rpmpd) the
> RPMh does not have an interface to enable the power, so the driver has
> to vote for a particular corner (performance level) in rpmh_power_on().
>
> But the corner is never initialized, so a typical request to simply
> enable the power domain would not actually turn on the hardware. Further
> more, when no more clients vote for a performance state (i.e. the
> aggregated vote is 0) the power domain would be turn off.

s/turn/turned/

>
> Fix both of these issues by always voting for a corner with non-zero
> value, when the power domain is enabled.
>
> The tracking of the lowest non-zero corner is performed to handle the
> corner case if there's ever a domain with a non-zero lowest corner, in
> which case both rpmh_power_on() and rpmh_rpmhpd_set_performance_state()
> would be allowed to use this lowest corner.
>
> Fixes: 279b7e8a62cc ("soc: qcom: rpmhpd: Add RPMh power domain driver")
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@chromium.org>

  reply	other threads:[~2021-07-08  0:23 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-03  0:54 [PATCH 0/2] soc: qcom: rpmhpd: Improve rpmhpd enable handling Bjorn Andersson
2021-07-03  0:54 ` [PATCH 1/2] soc: qcom: rpmhpd: Use corner in power_off Bjorn Andersson
2021-07-05  4:26   ` Rajendra Nayak
2021-07-05  5:06     ` Bjorn Andersson
2021-07-05  5:40       ` Rajendra Nayak
2021-07-07  4:49         ` Bjorn Andersson
2021-07-07  6:31           ` Rajendra Nayak
2021-07-07 15:48             ` Bjorn Andersson
2021-07-07 16:58               ` Dmitry Baryshkov
2021-07-08  0:21   ` Stephen Boyd
2021-07-08  4:35     ` Bjorn Andersson
2021-07-08  5:03       ` Rajendra Nayak
2021-07-08  6:51         ` Stephen Boyd
2021-07-15 10:40   ` Sibi Sankar
2021-07-03  0:54 ` [PATCH 2/2] soc: qcom: rpmhpd: Make power_on actually enable the domain Bjorn Andersson
2021-07-03  2:54   ` [RESEND PATCH " Bjorn Andersson
2021-07-08  0:23     ` Stephen Boyd [this message]
2021-07-08  0:25     ` Stephen Boyd
2021-07-14  9:22     ` Rajendra Nayak
2021-07-15 12:16     ` Sibi Sankar
2021-07-15 12:24       ` Rajendra Nayak
2021-08-12 13:21     ` Dmitry Baryshkov
2021-08-13  9:45       ` Ulf Hansson
2021-07-05 12:55 ` [PATCH 0/2] soc: qcom: rpmhpd: Improve rpmhpd enable handling Ulf Hansson

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