From: Julien Massot <julien.massot@collabora.com>
To: Jai Luthra <j-luthra@ti.com>,
Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Vaishnav Achath <vaishnav.a@ti.com>,
Maxime Ripard <mripard@kernel.org>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>
Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, Vignesh Raghavendra <vigneshr@ti.com>,
Aradhya Bhatia <a-bhatia1@ti.com>,
Devarsh Thakkar <devarsht@ti.com>,
Changhuang Liang <changhuang.liang@starfivetech.com>,
Jack Zhu <jack.zhu@starfivetech.com>,
Jayshri Pawar <jpawar@cadence.com>
Subject: Re: [PATCH RFC 02/21] media: cadence: csi2rx: configure DPHY before starting source stream
Date: Thu, 22 Feb 2024 15:29:54 +0100 [thread overview]
Message-ID: <766a4e5b-01fc-4fee-affa-9921ed7cd8f3@collabora.com> (raw)
In-Reply-To: <20240222-multistream-v1-2-1837ed916eeb@ti.com>
Hi Jai,
On 2/22/24 12:31, Jai Luthra wrote:
> From: Pratyush Yadav <p.yadav@ti.com>
>
> When the source device is operating above 1.5 Gbps per lane, it needs to
> send the Skew Calibration Sequence before sending any HS data. If the
> DPHY is initialized after the source stream is started, then it might
> miss the sequence and not be able to receive data properly. Move the
> start of source subdev to the end of the sequence to make sure
> everything is ready to receive data before the source starts streaming.
>
> Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> Signed-off-by: Jai Luthra <j-luthra@ti.com>
Thanks for your patch!
This patch is useful even at lower data rate than 1.5 Gbps.
I'm having the issue at 800Mbps with max96714F deserializer.
Should this patch deserve a Fixes tag?
Fixes: 3295cf1241d3 ("media: cadence: Add support for external dphy")
Reviewed-by: Julien Massot <julien.massot@collabora.com>
Tested-by: Julien Massot <julien.massot@collabora.com>
> ---
> drivers/media/platform/cadence/cdns-csi2rx.c | 26 ++++++++++++++------------
> 1 file changed, 14 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
> index 70b7f8a9e4f2..75e602c1d762 100644
> --- a/drivers/media/platform/cadence/cdns-csi2rx.c
> +++ b/drivers/media/platform/cadence/cdns-csi2rx.c
> @@ -243,10 +243,6 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
>
> writel(reg, csi2rx->base + CSI2RX_STATIC_CFG_REG);
>
> - ret = v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, true);
> - if (ret)
> - goto err_disable_pclk;
> -
> /* Enable DPHY clk and data lanes. */
> if (csi2rx->dphy) {
> reg = CSI2RX_DPHY_CL_EN | CSI2RX_DPHY_CL_RST;
> @@ -256,6 +252,13 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
> }
>
> writel(reg, csi2rx->base + CSI2RX_DPHY_LANE_CTRL_REG);
> +
> + ret = csi2rx_configure_ext_dphy(csi2rx);
> + if (ret) {
> + dev_err(csi2rx->dev,
> + "Failed to configure external DPHY: %d\n", ret);
> + goto err_disable_pclk;
> + }
> }
>
> /*
> @@ -295,14 +298,9 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
>
> reset_control_deassert(csi2rx->sys_rst);
>
> - if (csi2rx->dphy) {
> - ret = csi2rx_configure_ext_dphy(csi2rx);
> - if (ret) {
> - dev_err(csi2rx->dev,
> - "Failed to configure external DPHY: %d\n", ret);
> - goto err_disable_sysclk;
> - }
> - }
> + ret = v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, true);
> + if (ret)
> + goto err_disable_sysclk;
>
> clk_disable_unprepare(csi2rx->p_clk);
>
> @@ -316,6 +314,10 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
> clk_disable_unprepare(csi2rx->pixel_clk[i - 1]);
> }
>
> + if (csi2rx->dphy) {
> + writel(0, csi2rx->base + CSI2RX_DPHY_LANE_CTRL_REG);
> + phy_power_off(csi2rx->dphy);
> + }
> err_disable_pclk:
> clk_disable_unprepare(csi2rx->p_clk);
>
>
--
Julien Massot
Senior Software Engineer
Collabora Ltd.
Platinum Building, St John's Innovation Park, Cambridge CB4 0DS, UK
Registered in England & Wales, no. 5513718
next prev parent reply other threads:[~2024-02-22 14:29 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-22 11:31 [PATCH RFC 00/21] media: cadence,ti: CSI2RX Multistream Support Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 01/21] media: ti: j721e-csi2rx: Fix races while restarting DMA Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 02/21] media: cadence: csi2rx: configure DPHY before starting source stream Jai Luthra
2024-02-22 14:29 ` Julien Massot [this message]
2024-02-23 7:23 ` Jai Luthra
2024-02-23 2:46 ` 回复: " Changhuang Liang
2024-02-22 11:31 ` [PATCH RFC 03/21] media: cadence: csi2rx: Support runtime PM Jai Luthra
2024-03-22 9:26 ` 回复: " Changhuang Liang
2024-03-22 11:13 ` Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 04/21] dt-bindings: media: ti,j721e-csi2rx-shim: Support 32 dma chans Jai Luthra
2024-02-22 12:25 ` Rob Herring
2024-02-23 7:44 ` Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 05/21] media: ti: j721e-csi2rx: separate out device and context Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 06/21] media: ti: j721e-csi2rx: prepare SHIM code for multiple contexts Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 07/21] media: ti: j721e-csi2rx: allocate DMA channel based on context index Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 08/21] media: ti: j721e-csi2rx: add a subdev for the core device Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 09/21] SQUASH: media: ti: j721e-csi2rx: Fix link validation for multi-stream Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 10/21] media: ti: j721e-csi2rx: get number of contexts from device tree Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 11/21] media: cadence: csi2rx: add get_frame_desc wrapper Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 12/21] media: ti: j721e-csi2rx: add support for processing virtual channels Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 13/21] media: cadence: csi2rx: Use new enable stream APIs Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 14/21] media: cadence: csi2rx: Enable stream-wise routing Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 15/21] SQUASH: media: cadence: csi2rx: Enable per-stream controls Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 16/21] SQUASH: media: cadence: csi2rx: Filter using MIPI virtual channels Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 17/21] SQUASH: media: cadence: csi2rx: Filter streams in get_frame_desc Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 18/21] media: ti: j721e-csi2rx: add multistream support Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 19/21] SQUASH: media: ti: j721e-csi2rx: Enable per-stream controls Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 20/21] SQUASH: media: ti: j721e-csi2rx: Assert pixel reset before stopping last stream Jai Luthra
2024-02-22 11:31 ` [PATCH RFC 21/21] media: ti: j721e-csi2rx: Submit all available buffers Jai Luthra
2024-02-23 2:53 ` 回复: [PATCH RFC 00/21] media: cadence,ti: CSI2RX Multistream Support Changhuang Liang
2024-02-23 7:49 ` Jai Luthra
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