From: Johan Hovold <johan@kernel.org>
To: Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: Johan Hovold <johan+linaro@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andy Gross <agross@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Jiri Slaby <jirislaby@kernel.org>,
linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Rajendra Nayak <quic_rjendra@quicinc.com>,
Matthias Kaehlcke <mka@chromium.org>
Subject: Re: [PATCH 1/2] serial: qcom-geni: fix opp vote on shutdown
Date: Fri, 14 Jul 2023 17:08:05 +0200 [thread overview]
Message-ID: <ZLFk1Q0pTfYmB5EU@hovoldconsulting.com> (raw)
In-Reply-To: <e99b5975-b770-5460-1ce4-cd4eb1a50291@linaro.org>
On Fri, Jul 14, 2023 at 04:29:08PM +0200, Konrad Dybcio wrote:
> On 14.07.2023 15:02, Johan Hovold wrote:
> > The operating-performance-point vote needs to be dropped when shutting
> > down the port to avoid wasting power by keeping resources like power
> > domains in an unnecessarily high performance state (e.g. when a UART
> > connected Bluetooth controller is not in use).
> >
> > Fixes: a5819b548af0 ("tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state")
> > Cc: stable@vger.kernel.org # 5.9
> > Cc: Rajendra Nayak <quic_rjendra@quicinc.com>
> > Cc: Matthias Kaehlcke <mka@chromium.org>
> > Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> > ---
> I don't know a whole lot about this subsystem, but the PM call has
> a pointer to uport which already contains this clock rate.. Is it
> zeroed out by the core before we reach it, which would prevent us
> from reusing it?
No, but this driver has other issues and I couldn't be arsed fixing them
before addressing this bug.
Specifically that uartclk variable can currently be set by userspace...
I'll fix that up next week.
Johan
next prev parent reply other threads:[~2023-07-14 15:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-14 13:02 [PATCH 0/2] serial: qcom-geni: fix opp vote on shutdown Johan Hovold
2023-07-14 13:02 ` [PATCH 1/2] " Johan Hovold
2023-07-14 14:29 ` Konrad Dybcio
2023-07-14 15:08 ` Johan Hovold [this message]
2023-07-15 9:19 ` Konrad Dybcio
2023-07-14 13:02 ` [PATCH 2/2] serial: qcom-geni: clean up clock-rate debug printk Johan Hovold
2023-07-14 14:26 ` Konrad Dybcio
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