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

Eugen.Hristev
2019-01-11T07:25:32Z

On 10.01.2019 18:18, Luis de Oliveira wrote:
>
>
> On 09-Jan-19 13:07, Eugen.Hristev@microchip.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@synopsys.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.

Hi Luis,

I am currently trying to see if your driver works , and I need the RAW12
type, that's why I am asking about it.

One question related to the subdevice you create here, how do you
register this subdev into the media subsystem ? sync or async, or not at
all ?
After the driver probes, there is no call to the set format functions, I
added a node inside the Device tree, I see you are registering media
pads, but the other endpoint needs to be an async waiting for completion
node or your subdev registers in some other way ? (maybe some link
validation required ?)

Thanks for your help,

Eugen

>
> 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]
>>
>