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From: Benjamin Gaignard <benjamin.gaignard@st.com>
To: <hugues.fruchet@st.com>, <mchehab@kernel.org>,
	<mcoquelin.stm32@gmail.com>, <alexandre.torgue@st.com>
Cc: <linux-media@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <vincent.guittot@linaro.org>,
	<valentin.schneider@arm.com>, <rjw@rjwysocki.net>,
	Benjamin Gaignard <benjamin.gaignard@st.com>
Subject: [PATCH v6 0/3] DCMI set minimum cpufreq requirement
Date: Wed, 10 Jun 2020 14:24:57 +0200
Message-ID: <20200610122500.4304-1-benjamin.gaignard@st.com> (raw)

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.

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(-)

-- 
2.15.0


             reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-10 12:24 Benjamin Gaignard [this message]
2020-06-10 12:24 ` [PATCH v6 1/3] dt-bindings: media: stm32-dcmi: Add DCMI min frequency property Benjamin Gaignard
2020-06-23 11:48   ` Benjamin GAIGNARD
2020-06-10 12:24 ` [PATCH v6 2/3] media: stm32-dcmi: Set minimum cpufreq requirement Benjamin Gaignard
2020-06-10 17:16   ` Valentin Schneider
2020-06-24  9:24   ` Hugues FRUCHET
2020-06-24 11:27     ` Benjamin GAIGNARD
2020-06-10 12:25 ` [PATCH v6 3/3] ARM: dts: stm32: Set DCMI frequency requirement for stm32mp15x Benjamin Gaignard
2020-07-01 12:59 [PATCH v6 0/3] DCMI set minimum cpufreq requirement Benjamin Gaignard
2020-07-01 13:02 ` Benjamin GAIGNARD

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