From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Pratyush Yadav <p.yadav@ti.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Kishon Vijay Abraham I <kishon@ti.com>,
Vinod Koul <vkoul@kernel.org>,
Peter Ujfalusi <peter.ujfalusi@gmail.com>,
Maxime Ripard <mripard@kernel.org>,
Benoit Parrot <bparrot@ti.com>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Alexandre Courbot <acourbot@chromium.org>,
Stanimir Varbanov <stanimir.varbanov@linaro.org>,
Helen Koike <helen.koike@collabora.com>,
Michael Tretter <m.tretter@pengutronix.de>,
Peter Chen <peter.chen@nxp.com>,
Chunfeng Yun <chunfeng.yun@mediatek.com>,
linux-media@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org,
dmaengine@vger.kernel.org, Vignesh Raghavendra <vigneshr@ti.com>,
Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Subject: Re: [PATCH 09/16] media: cadence: csi2rx: Turn subdev power on before starting stream
Date: Fri, 2 Apr 2021 13:55:35 +0300 [thread overview]
Message-ID: <YGb4J5q9N0ExOgn9@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20210330173348.30135-10-p.yadav@ti.com>
Hi Pratyush,
Thank you for the patch.
On Tue, Mar 30, 2021 at 11:03:41PM +0530, Pratyush Yadav wrote:
> The subdevice power needs to be turned on before the stream is started.
> Otherwise it might not be in the proper state to stream the data. Turn
> it off when stopping the stream.
The .s_power() operation is deprecated. Subdev drivers should control
power internally in their .s_stream() operation, and they should use
runtime PM to do so (this will allow usage of runtime PM autosuspend, to
avoid expensive power off/on cycles when stopping and restarting video
capture).
> Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> ---
> drivers/media/platform/cadence/cdns-csi2rx.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
> index 7d1ac51e0698..3385e1bc213e 100644
> --- a/drivers/media/platform/cadence/cdns-csi2rx.c
> +++ b/drivers/media/platform/cadence/cdns-csi2rx.c
> @@ -256,6 +256,10 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
>
> writel(reg, csi2rx->base + CSI2RX_STATIC_CFG_REG);
>
> + ret = v4l2_subdev_call(csi2rx->source_subdev, core, s_power, true);
> + if (ret && ret != -ENOIOCTLCMD)
> + goto err_disable_pclk;
> +
> ret = v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, true);
> if (ret)
> goto err_disable_pclk;
> @@ -358,6 +362,10 @@ static void csi2rx_stop(struct csi2rx_priv *csi2rx)
> if (v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, false))
> dev_warn(csi2rx->dev, "Couldn't disable our subdev\n");
>
> + ret = v4l2_subdev_call(csi2rx->source_subdev, core, s_power, false);
> + if (ret && ret != -ENOIOCTLCMD)
> + dev_warn(csi2rx->dev, "Couldn't power off subdev\n");
> +
> if (csi2rx->dphy) {
> writel(0, csi2rx->base + CSI2RX_DPHY_LANE_CTRL_REG);
>
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2021-04-02 10:56 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-30 17:33 [PATCH 00/16] CSI2RX support on J721E Pratyush Yadav
2021-03-30 17:33 ` [PATCH 01/16] phy: Distinguish between Rx and Tx for MIPI D-PHY with submodes Pratyush Yadav
2021-03-30 17:33 ` [PATCH 02/16] phy: cdns-dphy: Prepare for Rx support Pratyush Yadav
2021-03-30 17:33 ` [PATCH 03/16] phy: cdns-dphy: Allow setting mode Pratyush Yadav
2021-04-02 10:38 ` Laurent Pinchart
2021-04-06 18:22 ` Pratyush Yadav
2021-03-30 17:33 ` [PATCH 04/16] phy: cdns-dphy: Add Rx support Pratyush Yadav
2021-03-30 17:33 ` [PATCH 05/16] media: cadence: csi2rx: Add external DPHY support Pratyush Yadav
2021-03-31 9:24 ` Chunfeng Yun
2021-04-06 18:54 ` Pratyush Yadav
2021-04-08 8:13 ` Chunfeng Yun
2021-04-08 8:22 ` Tomi Valkeinen
2021-03-30 17:33 ` [PATCH 06/16] media: cadence: csi2rx: Soft reset the streams before starting capture Pratyush Yadav
2021-03-30 17:33 ` [PATCH 07/16] media: cadence: csi2rx: Set the STOP bit when stopping a stream Pratyush Yadav
2021-03-30 17:33 ` [PATCH 08/16] media: cadence: csi2rx: Fix stream data configuration Pratyush Yadav
2021-03-30 17:33 ` [PATCH 09/16] media: cadence: csi2rx: Turn subdev power on before starting stream Pratyush Yadav
2021-04-02 10:55 ` Laurent Pinchart [this message]
2021-04-06 17:53 ` Pratyush Yadav
2021-03-30 17:33 ` [PATCH 10/16] media: cadence: csi2rx: Add wrappers for subdev calls Pratyush Yadav
2021-04-02 10:47 ` Laurent Pinchart
2021-04-06 15:11 ` Pratyush Yadav
2021-03-30 17:33 ` [PATCH 11/16] dmaengine: ti: k3-psil-j721e: Add entry for CSI2RX Pratyush Yadav
2021-04-04 13:24 ` Péter Ujfalusi
2021-04-06 15:09 ` Pratyush Yadav
2021-04-06 15:33 ` Péter Ujfalusi
2021-04-06 16:55 ` Pratyush Yadav
2021-04-06 17:10 ` Pratyush Yadav
2021-04-06 19:13 ` Péter Ujfalusi
2021-03-30 17:33 ` [PATCH 12/16] dt-bindings: media: Add DT bindings for TI CSI2RX driver Pratyush Yadav
2021-03-31 13:40 ` Rob Herring
2021-04-01 15:52 ` Rob Herring
2021-04-02 10:01 ` Laurent Pinchart
2021-04-02 10:53 ` Laurent Pinchart
2021-04-06 18:15 ` Pratyush Yadav
2021-04-06 18:13 ` Pratyush Yadav
2021-04-06 18:00 ` Pratyush Yadav
2021-04-01 15:52 ` Rob Herring
2021-03-30 17:33 ` [PATCH 13/16] media: ti-vpe: csi2rx: Add CSI2RX support Pratyush Yadav
2021-03-31 6:06 ` Tomi Valkeinen
2021-03-31 15:44 ` Benoit Parrot
2021-03-31 15:50 ` Laurent Pinchart
2021-04-06 15:05 ` Pratyush Yadav
2021-04-04 13:38 ` Péter Ujfalusi
2021-03-30 17:33 ` [PATCH 14/16] dt-bindings: phy: Convert Cadence DPHY binding to YAML Pratyush Yadav
2021-04-02 10:23 ` Laurent Pinchart
2021-04-06 18:51 ` Pratyush Yadav
2021-03-30 17:33 ` [PATCH 15/16] dt-bindings: phy: cdns,dphy: make clocks optional Pratyush Yadav
2021-04-02 10:31 ` Laurent Pinchart
2021-04-06 18:48 ` Pratyush Yadav
2021-03-30 17:33 ` [PATCH 16/16] dt-bindings: phy: cdns,dphy: add power-domains property Pratyush Yadav
2021-04-02 10:35 ` Laurent Pinchart
2021-04-06 18:23 ` Pratyush Yadav
2021-03-31 9:33 ` [PATCH 00/16] CSI2RX support on J721E Vinod Koul
2021-03-31 11:40 ` Pratyush Yadav
2021-03-31 13:06 ` Vinod Koul
2021-03-31 13:51 ` Pratyush Yadav
2021-04-02 10:57 ` Laurent Pinchart
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