linux-kernel - Re: [PATCH v6 0/3] DCMI set minimum cpufreq requirement

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Date:   Wed, 1 Jul 2020 13:02:45 +0000
From:   Benjamin GAIGNARD <benjamin.gaignard@...com>
To:     Hugues FRUCHET <hugues.fruchet@...com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
        "valentin.schneider@....com" <valentin.schneider@....com>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6 0/3] DCMI set minimum cpufreq requirement



On 7/1/20 2:59 PM, Benjamin Gaignard wrote:
> This series allow to STM32 camera interface (DCMI) to require a minimum
> frequency to the CPUs before start streaming frames from the sensor.
> The minimum frequency requirement is provided in the devide-tree node.
>
> Setting a minimum frequency for the CPUs is needed to ensure a quick handling
> of the interrupts between two sensor frames and avoid dropping half of them.
Please forget this version, the incoming version 7 should have fix your 
remarks.

Sorry,
Benjamin
> version 6:
> - come back to version 4 and follow Valentin's suggestions about notifier
>
> version 5:
> - add a mutex to protect dcmi_irq_notifier_notify()
> - register notifier a probe time
>
> version 4:
> - simplify irq affinity handling by using only dcmi_irq_notifier_notify()
>
> version 3:
> - add a cpumask field to track boosted CPUs
> - add irq_affinity_notify callback
> - protect cpumask field with a mutex
>
> Benjamin Gaignard (3):
>    dt-bindings: media: stm32-dcmi: Add DCMI min frequency property
>    media: stm32-dcmi: Set minimum cpufreq requirement
>    ARM: dts: stm32: Set DCMI frequency requirement for stm32mp15x
>
>   .../devicetree/bindings/media/st,stm32-dcmi.yaml   |   8 ++
>   arch/arm/boot/dts/stm32mp151.dtsi                  |   1 +
>   drivers/media/platform/stm32/stm32-dcmi.c          | 138 +++++++++++++++++++--
>   3 files changed, 139 insertions(+), 8 deletions(-)
>