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Message-ID: <m3wohs1gkc.fsf@gmail.com>
Date: Tue, 11 Jun 2019 12:56:19 +0100
From: Rui Miguel Silva <rmfrfs@...il.com>
To: Sébastien Szymanski
<sebastien.szymanski@...adeus.com>
Cc: devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
linux-media@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Steve Longerbeam <slongerbeam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Fabio Estevam <festevam@...il.com>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Sascha Hauer <s.hauer@...gutronix.de>,
Mark Rutland <mark.rutland@....com>,
Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2 2/3] media: imx7-media-csi: add i.MX6UL support
Hi Sebastien,
On Tue 11 Jun 2019 at 11:03, Sébastien Szymanski wrote:
> On 6/11/19 11:40 AM, Rui Miguel Silva wrote:
>> Hi Sebastien,
>> On Tue 11 Jun 2019 at 09:16, Sébastien Szymanski wrote:
>>> Hi Rui,
>>>
>>> thanks for the review!
>>>
>>> On 6/10/19 12:28 PM, Rui Miguel Silva wrote:
>>>> Hi Sebastien,
>>>> Thanks for the patch.
>>>>
>>>> On Thu 06 Jun 2019 at 16:38, Sébastien Szymanski wrote:
>>>>> i.MX7 and i.MX6UL/L have the same CSI controller. So add i.MX6UL/L support
>>>>> to imx7-media-csi driver.
>>>>>
>>>>> Signed-off-by: Sébastien Szymanski <sebastien.szymanski@...adeus.com>
>>>>> ---
>>>>>
>>>>> Changes for v2:
>>>>> - rebase on top of linuxtv/master
>>>>> - mention i.MX6UL/L in header and Kconfig help text
>>>>> - rename csi_type to csi_soc_id
>>>>>
>>>>> drivers/staging/media/imx/Kconfig | 4 +-
>>>>> drivers/staging/media/imx/imx7-media-csi.c | 62 ++++++++++++++++------
>>>>> 2 files changed, 49 insertions(+), 17 deletions(-)
>>>>>
>>>>> diff --git a/drivers/staging/media/imx/Kconfig b/drivers/staging/media/imx/Kconfig
>>>>> index ad3d7df6bb3c..8b6dc42c39e0 100644
>>>>> --- a/drivers/staging/media/imx/Kconfig
>>>>> +++ b/drivers/staging/media/imx/Kconfig
>>>>> @@ -22,11 +22,11 @@ config VIDEO_IMX_CSI
>>>>> A video4linux camera sensor interface driver for i.MX5/6.
>>>>>
>>>>> config VIDEO_IMX7_CSI
>>>>> - tristate "i.MX7 Camera Sensor Interface driver"
>>>>> + tristate "i.MX6UL/L / i.MX7 Camera Sensor Interface driver"
>>>>> depends on VIDEO_IMX_MEDIA && VIDEO_DEV && I2C
>>>>> default y
>>>>> help
>>>>> Enable support for video4linux camera sensor interface driver for
>>>>> - i.MX7.
>>>>> + i.MX6UL/L or i.MX7.
>>>>> endmenu
>>>>> endif
>>>>> diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
>>>>> index 9101566f3f67..902bdce594cf 100644
>>>>> --- a/drivers/staging/media/imx/imx7-media-csi.c
>>>>> +++ b/drivers/staging/media/imx/imx7-media-csi.c
>>>>> @@ -1,6 +1,6 @@
>>>>> // SPDX-License-Identifier: GPL-2.0
>>>>> /*
>>>>> - * V4L2 Capture CSI Subdev for Freescale i.MX7 SOC
>>>>> + * V4L2 Capture CSI Subdev for Freescale i.MX6UL/L / i.MX7 SOC
>>>>> *
>>>>> * Copyright (c) 2019 Linaro Ltd
>>>>> *
>>>>> @@ -152,6 +152,11 @@
>>>>> #define CSI_CSICR18 0x48
>>>>> #define CSI_CSICR19 0x4c
>>>>>
>>>>> +enum csi_soc_id {
>>>>> + IMX7,
>>>>> + IMX6UL
>>>>> +};
>>>>> +
>>>>> struct imx7_csi {
>>>>> struct device *dev;
>>>>> struct v4l2_subdev sd;
>>>>> @@ -191,6 +196,7 @@ struct imx7_csi {
>>>>> bool is_init;
>>>>> bool is_streaming;
>>>>> bool is_csi2;
>>>>> + enum csi_soc_id soc_id;
>>>>>
>>>>> struct completion last_eof_completion;
>>>>> };
>>>>> @@ -548,6 +554,14 @@ static int imx7_csi_pad_link_validate(struct v4l2_subdev *sd,
>>>>> if (ret)
>>>>> return ret;
>>>>>
>>>>> + if (csi->soc_id == IMX6UL) {
>>>>> + mutex_lock(&csi->lock);
>>>>> + csi->is_csi2 = false;
>>>>> + mutex_unlock(&csi->lock);
>>>>> +
>>>>> + return 0;
>>>>> + }
>>>>> +
>>>>> ret = imx7_csi_get_upstream_endpoint(csi, &upstream_ep, true);
>>>>> if (ret) {
>>>>> v4l2_err(&csi->sd, "failed to find upstream endpoint\n");
>>>>> @@ -757,6 +771,7 @@ static int imx7_csi_configure(struct imx7_csi *csi)
>>>>> struct v4l2_pix_format *out_pix = &vdev->fmt.fmt.pix;
>>>>> __u32 in_code = csi->format_mbus[IMX7_CSI_PAD_SINK].code;
>>>>> u32 cr1, cr18;
>>>>> + int width = out_pix->width;
>>>>>
>>>>> if (out_pix->field == V4L2_FIELD_INTERLACED) {
>>>>> imx7_csi_deinterlace_enable(csi, true);
>>>>> @@ -766,15 +781,27 @@ static int imx7_csi_configure(struct imx7_csi *csi)
>>>>> imx7_csi_buf_stride_set(csi, 0);
>>>>> }
>>>>>
>>>>> - imx7_csi_set_imagpara(csi, out_pix->width, out_pix->height);
>>>>> + cr18 = imx7_csi_reg_read(csi, CSI_CSICR18);
>>>>> +
>>>>> + if (!csi->is_csi2) {
>>>>> + if (out_pix->pixelformat == V4L2_PIX_FMT_UYVY ||
>>>>> + out_pix->pixelformat == V4L2_PIX_FMT_YUYV)
>>>>> + width *= 2;
>>>>> +
>>>>> + imx7_csi_set_imagpara(csi, width, out_pix->height);
>>>>> +
>>>>> + cr18 |= (BIT_BASEADDR_SWITCH_EN | BIT_BASEADDR_SWITCH_SEL |
>>>>> + BIT_BASEADDR_CHG_ERR_EN);
>>>>> + imx7_csi_reg_write(csi, cr18, CSI_CSICR18);
>>>>>
>>>>> - if (!csi->is_csi2)
>>>>> return 0;
>>>>> + }
>>>>> +
>>>>> + imx7_csi_set_imagpara(csi, width, out_pix->height);
>>>>>
>>>>> cr1 = imx7_csi_reg_read(csi, CSI_CSICR1);
>>>>> cr1 &= ~BIT_GCLK_MODE;
>>>>>
>>>>> - cr18 = imx7_csi_reg_read(csi, CSI_CSICR18);
>>>>> cr18 &= BIT_MIPI_DATA_FORMAT_MASK;
>>>>> cr18 |= BIT_DATA_FROM_MIPI;
>>>>>
>>>>> @@ -809,11 +836,9 @@ static void imx7_csi_enable(struct imx7_csi *csi)
>>>>> {
>>>>> imx7_csi_sw_reset(csi);
>>>>>
>>>>> - if (csi->is_csi2) {
>>>>> - imx7_csi_dmareq_rff_enable(csi);
>>>>> - imx7_csi_hw_enable_irq(csi);
>>>>> - imx7_csi_hw_enable(csi);
>>>>> - }
>>>>> + imx7_csi_dmareq_rff_enable(csi);
>>>>> + imx7_csi_hw_enable_irq(csi);
>>>>> + imx7_csi_hw_enable(csi);
>>>>> }
>>>>>
>>>>> static void imx7_csi_disable(struct imx7_csi *csi)
>>>>> @@ -1166,19 +1191,32 @@ static int imx7_csi_parse_endpoint(struct device *dev,
>>>>> return fwnode_device_is_available(asd->match.fwnode) ? 0 : -EINVAL;
>>>>> }
>>>>>
>>>>> +static const struct of_device_id imx7_csi_of_match[] = {
>>>>> + { .compatible = "fsl,imx7-csi", .data = (void *)IMX7 },
>>>>> + { .compatible = "fsl,imx6ul-csi", .data = (void *)IMX6UL },
>>>>
>>>> looking at this again I think we can do this is a different way.
>>>> Instead data being the soc_id, just set here if it is_csi2 or not.
>>>>
>>>> This would avoid to add a soc_id to the struct that it really it
>>>> is used only to setup the is_csi2 var. I think this will make this
>>>> patch a lot simpler.
>>>
>>> Well, I have added this soc_id because imx7_csi_get_upstream_endpoint in
>>> imx7_csi_pad_link_validate fails:
>>>
>>> [ 366.549768] csi: failed to find upstream endpoint
>>> [ 366.556274] csi: pipeline start failed with -19
>>>
>>
>> I think this fails because you do not define any endpoint for the
>> csi in your board dts file. I see in patch 1/3 the setup of csi,
>> disabled, but not the endpoint connecting csi with the ov5640 in
>> your board file (see the connection between mipi imx7 and ov2680
>> in the imx7-warp.dts, or the ov5640.txt file).
>
> I actually do, in the device tree of my board I have:
Yeah, I thought you did this, because if not it did not work in
the first place. I will take a look at why the fetch of the
upstream endpoint is not working. it should :).
Thanks for the feedback. I will let you know.
---
Cheers,
Rui
>
> &csi {
> pinctrl-names = "default";
> pinctrl-0 = <&pinctrl_csi>;
> status = "okay";
>
> port {
> csi_ep: endpoint {
> remote-endpoint = <&ov5640_ep>;
> bus-type = <5>; // V4L2_FWNODE_BUS_TYPE_PARALLEL
> };
> };
> };
>
> and
>
> &i2c2 {
> ..
> ov5640: camera@3c {
> ...
> port {
> ov5640_ep: endpoint {
> remote-endpoint = <&csi_ep>;
> bus-width = <8>;
> data-shift = <2>; /* lines 9:2 are used */
> hsync-active = <0>;
> vsync-active = <1>;
> pclk-sample = <0>;
> };
> };
> };
> };
>
> Regards,
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