linux-kernel - Re: [V3, 4/4] media: platform: dwc: Add MIPI CSI-2 controller driver

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Date:   Thu, 10 Jan 2019 16:18:38 +0000
From:   Luis de Oliveira <luis.oliveira@...opsys.com>
To:     <Eugen.Hristev@...rochip.com>, <luis.oliveira@...opsys.com>,
        <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <joao.pinto@...opsys.com>, <festevam@...il.com>,
        <mchehab@...nel.org>, <gregkh@...uxfoundation.org>,
        <davem@...emloft.net>, <akpm@...ux-foundation.org>,
        <arnd@...db.de>, <hans.verkuil@...co.com>,
        <laurent.pinchart@...asonboard.com>, <geert@...ux-m68k.org>,
        <narmstrong@...libre.com>, <p.zabel@...gutronix.de>,
        <treding@...dia.com>, <maxime.ripard@...tlin.com>,
        <todor.tomov@...aro.org>
Subject: Re: [V3, 4/4] media: platform: dwc: Add MIPI CSI-2 controller driver



On 09-Jan-19 13:07, Eugen.Hristev@...rochip.com wrote:
> 
> 
> On 19.10.2018 15:52, Luis Oliveira wrote:
>> Add the Synopsys MIPI CSI-2 controller driver. This
>> controller driver is divided in platform dependent functions
>> and core functions. It also includes a platform for future
>> DesignWare drivers.
>>
>> Signed-off-by: Luis Oliveira <lolivei@...opsys.com>
>> ---
>> Changelog
>> v2-V3
>> - exposed IPI settings to userspace
>> - fixed headers
>>
>>   MAINTAINERS                              |  11 +
>>   drivers/media/platform/dwc/Kconfig       |  30 +-
>>   drivers/media/platform/dwc/Makefile      |   2 +
>>   drivers/media/platform/dwc/dw-csi-plat.c | 699 +++++++++++++++++++++++++++++++
>>   drivers/media/platform/dwc/dw-csi-plat.h |  77 ++++
>>   drivers/media/platform/dwc/dw-mipi-csi.c | 494 ++++++++++++++++++++++
>>   drivers/media/platform/dwc/dw-mipi-csi.h | 202 +++++++++
>>   include/media/dwc/dw-mipi-csi-pltfrm.h   | 102 +++++
>>   8 files changed, 1616 insertions(+), 1 deletion(-)
>>   create mode 100644 drivers/media/platform/dwc/dw-csi-plat.c
>>   create mode 100644 drivers/media/platform/dwc/dw-csi-plat.h
>>   create mode 100644 drivers/media/platform/dwc/dw-mipi-csi.c
>>   create mode 100644 drivers/media/platform/dwc/dw-mipi-csi.h
>>   create mode 100644 include/media/dwc/dw-mipi-csi-pltfrm.h
>>
> 
> [snip]
> 
>> +/* Video formats supported by the MIPI CSI-2 */
>> +const struct mipi_fmt dw_mipi_csi_formats[] = {
>> +	{
>> +		/* RAW 8 */
>> +		.code = MEDIA_BUS_FMT_SBGGR8_1X8,
>> +		.depth = 8,
>> +	},
>> +	{
>> +		/* RAW 10 */
>> +		.code = MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE,
>> +		.depth = 10,
>> +	},
> 
> Hi Luis,
> 
> Any reason why RAW12 format is not handled here ?
> 
> Here, namely MEDIA_BUS_FMT_SBGGR12_1X12 etc.
> 
Hi Eugen,

My Hw testing setup currently does not support it, so I didn't add it.

>> +	{
>> +		/* RGB 565 */
>> +		.code = MEDIA_BUS_FMT_RGB565_2X8_BE,
>> +		.depth = 16,
>> +	},
>> +	{
>> +		/* BGR 565 */
>> +		.code = MEDIA_BUS_FMT_RGB565_2X8_LE,
>> +		.depth = 16,
>> +	},
>> +	{
>> +		/* RGB 888 */
>> +		.code = MEDIA_BUS_FMT_RGB888_2X12_LE,
>> +		.depth = 24,
>> +	},
>> +	{
>> +		/* BGR 888 */
>> +		.code = MEDIA_BUS_FMT_RGB888_2X12_BE,
>> +		.depth = 24,
>> +	},
>> +};
> 
> [snip]
> 
>> +
>> +void dw_mipi_csi_set_ipi_fmt(struct mipi_csi_dev *csi_dev)
>> +{
>> +	struct device *dev = csi_dev->dev;
>> +
>> +	if (csi_dev->ipi_dt)
>> +		dw_mipi_csi_write(csi_dev, reg.IPI_DATA_TYPE, csi_dev->ipi_dt);
>> +	else {
>> +		switch (csi_dev->fmt->code) {
>> +		case MEDIA_BUS_FMT_RGB565_2X8_BE:
>> +		case MEDIA_BUS_FMT_RGB565_2X8_LE:
>> +			dw_mipi_csi_write(csi_dev,
>> +					reg.IPI_DATA_TYPE, CSI_2_RGB565);
>> +			dev_dbg(dev, "DT: RGB 565");
>> +			break;
>> +
>> +		case MEDIA_BUS_FMT_RGB888_2X12_LE:
>> +		case MEDIA_BUS_FMT_RGB888_2X12_BE:
>> +			dw_mipi_csi_write(csi_dev,
>> +					reg.IPI_DATA_TYPE, CSI_2_RGB888);
>> +			dev_dbg(dev, "DT: RGB 888");
>> +			break;
>> +		case MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE:
>> +			dw_mipi_csi_write(csi_dev,
>> +					reg.IPI_DATA_TYPE, CSI_2_RAW10);
>> +			dev_dbg(dev, "DT: RAW 10");
>> +			break;
>> +		case MEDIA_BUS_FMT_SBGGR8_1X8:
>> +			dw_mipi_csi_write(csi_dev,
>> +					reg.IPI_DATA_TYPE, CSI_2_RAW8);
>> +			dev_dbg(dev, "DT: RAW 8");
>> +			break;
> 
> Same here, in CSI_2_RAW12 case it will default to a RGB565 case.
> 
> Thanks,
> 
> Eugen
> 
> 
I will try to add the support for this data type in my next patchset if not I
will flag it as unsupported for now in the commit message and code.

Thanks for your review,
Luis

> 
>> +		default:
>> +			dw_mipi_csi_write(csi_dev,
>> +					reg.IPI_DATA_TYPE, CSI_2_RGB565);
>> +			dev_dbg(dev, "Error");
>> +			break;
>> +		}
>> +	}
>> +}
>> +
> 
> [snip]
>