Re: [PATCH 2/3] mx3_camera: Support correctly the YUV222 and BAYERconfigurations of CSI

From: Guennadi Liakhovetski
Date: Tue Nov 30 2010 - 09:32:11 EST

On Tue, 30 Nov 2010, Alberto Panizzo wrote:

> On dom, 2010-11-28 at 18:24 +0100, Alberto Panizzo wrote:
> > This patch is tested and works with the OV2640 camera that output
> > YUV422 (UYVY) and RGB565 data.
> >
> > The YUV422 format is managed to be converted in IPU internal YUV444 format
> > so this stream could be used in the future to feed directly other IPU
> > blocks.
> > The RGB565 format is managed as GENERIC and can be moved only from CSI
> > to memory.
> >
> > Signed-off-by: Alberto Panizzo <maramaopercheseimorto@xxxxxxxxx>
> > ---
> >
> > Before applying, please give me feedback if this break in some way other
> > pixel formats!
> >
> >
>
> Hi Guennadi,
> Have you got time to test this patch?
> I think that this will solve the problems that lead to the need of
> translating the 10 bits mbus codes to the corresponding 8 bit ones.

Yes, I certainly will review and (hopefully) test this patch, just,
please, give me some time. Since this is 2.6.38 material anyway, we still
have a bit of time.

Thanks
Guennadi

>
> Best regards,
> Alberto!
>
> > drivers/media/video/mx3_camera.c | 126 +++++++++++++++++++++++++++++++++-----
> > 1 files changed, 110 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/media/video/mx3_camera.c b/drivers/media/video/mx3_camera.c
> > index 29c5fc3..6811d6f 100644
> > --- a/drivers/media/video/mx3_camera.c
> > +++ b/drivers/media/video/mx3_camera.c
> > @@ -55,6 +55,31 @@
> > #define CSI_SENS_CONF_EXT_VSYNC_SHIFT 15
> > #define CSI_SENS_CONF_DIVRATIO_SHIFT 16
> >
> > +/*
> > + * IPU support the following data formatting (44.1.1.3 Data Flows and Formats):
> > + * 1 YUV 4:4:4 or RGBâ8 bits per color component
> > + * 2 YUV 4:4:4 or RGBâ10 bits per color component
> > + * 3 Generic data (from sensor to the system memory only)
> > + * The formats 1 and 2 are aligned in words of 32 bits, 3 is free and not
> > + * recognized by IPU blocks.
> > + *
> > + * Taking the value of SENS_DATA_FORMAT and DATA_WIDTH, the CSI tries to
> > + * align (or rearrange) the sampled data to fit the IPU supported formats
> > + * as follows:
> > + * - CSI_SENS_CONF_DATA_FMT_RGB_YUV444: It consider the pixel as a sequence of
> > + * 3 components of width DATA_WIDTH aligning these to a 32 bit word.
> > + * The CSI output in this case can feed other IPU blocks.
> > + * - CSI_SENS_CONF_DATA_FMT_YUV422: It consider the pixel as a sequence of
> > + * 2 components of width DATA_WIDTH were the first is the alternating U V
> > + * components and the second is Y. It construct the YUV444 word repeating
> > + * the previous U, V samples aligning the results to a 32 bit word.
> > + * The CSI output in this case can feed other IPU blocks.
> > + * - CSI_SENS_CONF_DATA_FMT_BAYER: No rework is performed in this case.
> > + * The sensor data is given as is, considering _every sample_ as a pixel
> > + * data. This format (combined with the GENERIC IPU pixel formats) can
> > + * carry all the other sensor pixel formats to the system memory.
> > + * The CSI output in this case _can not_ feed other IPU blocks.
> > + */
> > #define CSI_SENS_CONF_DATA_FMT_RGB_YUV444 (0UL << CSI_SENS_CONF_DATA_FMT_SHIFT)
> > #define CSI_SENS_CONF_DATA_FMT_YUV422 (2UL << CSI_SENS_CONF_DATA_FMT_SHIFT)
> > #define CSI_SENS_CONF_DATA_FMT_BAYER (3UL << CSI_SENS_CONF_DATA_FMT_SHIFT)
> > @@ -323,14 +348,12 @@ static enum pixel_fmt fourcc_to_ipu_pix(__u32 fourcc)
> > {
> > /* Add more formats as need arises and test possibilities appear... */
> > switch (fourcc) {
> > - case V4L2_PIX_FMT_RGB565:
> > - return IPU_PIX_FMT_RGB565;
> > case V4L2_PIX_FMT_RGB24:
> > return IPU_PIX_FMT_RGB24;
> > + case V4L2_PIX_FMT_UYVY:
> > + return IPU_PIX_FMT_UYVY;
> > + case V4L2_PIX_FMT_RGB565:
> > case V4L2_PIX_FMT_RGB332:
> > - return IPU_PIX_FMT_RGB332;
> > - case V4L2_PIX_FMT_YUV422P:
> > - return IPU_PIX_FMT_YVU422P;
> > default:
> > return IPU_PIX_FMT_GENERIC;
> > }
> > @@ -358,9 +381,25 @@ static void mx3_videobuf_queue(struct videobuf_queue *vq,
> >
> > /* This is the configuration of one sg-element */
> > video->out_pixel_fmt = fourcc_to_ipu_pix(fourcc);
> > - video->out_width = icd->user_width;
> > - video->out_height = icd->user_height;
> > - video->out_stride = icd->user_width;
> > +
> > + if (video->out_pixel_fmt == IPU_PIX_FMT_GENERIC) {
> > + /*
> > + * IPU_PIX_FMT_GENERIC transport bytes, not pixels. So convert
> > + * video->out_width and stride to the correct unit.
> > + */
> > + int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
> > + icd->current_fmt->host_fmt);
> > + BUG_ON(bytes_per_line <= 0);
> > +
> > + video->out_width = bytes_per_line;
> > + video->out_height = icd->user_height;
> > + video->out_stride = bytes_per_line;
> > + } else {
> > + /* For IPU known formats the pixel unit is OK */
> > + video->out_width = icd->user_width;
> > + video->out_height = icd->user_height;
> > + video->out_stride = icd->user_width;
> > + }
> >
> > #ifdef DEBUG
> > /* helps to see what DMA actually has written */
> > @@ -730,18 +769,68 @@ static int mx3_camera_get_formats(struct soc_camera_device *icd, unsigned int id
> > if (xlate) {
> > xlate->host_fmt = fmt;
> > xlate->code = code;
> > + dev_dbg(dev, "Providing format %c%c%c%c in pass-through mode\n",
> > + (xlate->host_fmt->fourcc >> (0*8)) & 0xFF,
> > + (xlate->host_fmt->fourcc >> (1*8)) & 0xFF,
> > + (xlate->host_fmt->fourcc >> (2*8)) & 0xFF,
> > + (xlate->host_fmt->fourcc >> (3*8)) & 0xFF);
> > xlate++;
> > - dev_dbg(dev, "Providing format %x in pass-through mode\n",
> > - xlate->host_fmt->fourcc);
> > }
> >
> > return formats;
> > }
> >
> > +static int samples_per_pixel(enum v4l2_mbus_pixelcode mcode)
> > +{
> > + switch (mcode) {
> > + case V4L2_MBUS_FMT_YUYV8_2X8:
> > + case V4L2_MBUS_FMT_YVYU8_2X8:
> > + case V4L2_MBUS_FMT_VYUY8_2X8:
> > + case V4L2_MBUS_FMT_YVYU10_2X10:
> > + case V4L2_MBUS_FMT_YUYV10_2X10:
> > + case V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE:
> > + case V4L2_MBUS_FMT_RGB444_2X8_PADHI_BE:
> > + case V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE:
> > + case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
> > + case V4L2_MBUS_FMT_RGB565_2X8_LE:
> > + case V4L2_MBUS_FMT_RGB565_2X8_BE:
> > + case V4L2_MBUS_FMT_BGR565_2X8_LE:
> > + case V4L2_MBUS_FMT_BGR565_2X8_BE:
> > + return 2;
> > + case V4L2_MBUS_FMT_SBGGR8_1X8:
> > + case V4L2_MBUS_FMT_SBGGR10_1X10:
> > + case V4L2_MBUS_FMT_GREY8_1X8:
> > + case V4L2_MBUS_FMT_Y10_1X10:
> > + case V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE:
> > + case V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_BE:
> > + case V4L2_MBUS_FMT_SGRBG8_1X8:
> > + return 1;
> > + default:
> > + /* Add other pixel codes as needed */
> > + return 0;
> > + }
> > +}
> > +
> > static void configure_geometry(struct mx3_camera_dev *mx3_cam,
> > - unsigned int width, unsigned int height)
> > + unsigned int width, unsigned int height,
> > + enum v4l2_mbus_pixelcode code)
> > {
> > u32 ctrl, width_field, height_field;
> > + const struct soc_mbus_pixelfmt *fmt;
> > +
> > + fmt = soc_mbus_get_fmtdesc(code);
> > + BUG_ON(!fmt);
> > +
> > + if (fourcc_to_ipu_pix(fmt->fourcc) == IPU_PIX_FMT_GENERIC) {
> > + /*
> > + * As we don't have an IPU native format, the CSI will be
> > + * configured to output BAYER and here we need to convert
> > + * geometry unit from pixels to samples.
> > + * TODO: Support vertical down sampling (YUV420)
> > + */
> > + width = width * samples_per_pixel(code);
> > + BUG_ON(!width);
> > + }
> >
> > /* Setup frame size - this cannot be changed on-the-fly... */
> > width_field = width - 1;
> > @@ -850,7 +939,7 @@ static int mx3_camera_set_crop(struct soc_camera_device *icd,
> > return ret;
> > }
> >
> > - configure_geometry(mx3_cam, mf.width, mf.height);
> > + configure_geometry(mx3_cam, mf.width, mf.height, mf.code);
> > }
> >
> > dev_dbg(icd->dev.parent, "Sensor cropped %dx%d\n",
> > @@ -893,7 +982,7 @@ static int mx3_camera_set_fmt(struct soc_camera_device *icd,
> > * mxc_v4l2_s_fmt()
> > */
> >
> > - configure_geometry(mx3_cam, pix->width, pix->height);
> > + configure_geometry(mx3_cam, pix->width, pix->height, xlate->code);
> >
> > mf.width = pix->width;
> > mf.height = pix->height;
> > @@ -1112,10 +1201,15 @@ static int mx3_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
> > (3 << CSI_SENS_CONF_DATA_FMT_SHIFT) |
> > (3 << CSI_SENS_CONF_DATA_WIDTH_SHIFT));
> >
> > - /* TODO: Support RGB and YUV formats */
> > + /* TODO: Support RGB_YUV444 formats */
> >
> > - /* This has been set in mx3_camera_activate(), but we clear it above */
> > - sens_conf |= CSI_SENS_CONF_DATA_FMT_BAYER;
> > + switch (xlate->code) {
> > + case V4L2_MBUS_FMT_UYVY8_2X8:
> > + sens_conf |= CSI_SENS_CONF_DATA_FMT_YUV422;
> > + break;
> > + default:
> > + sens_conf |= CSI_SENS_CONF_DATA_FMT_BAYER;
> > + }
> >
> > if (common_flags & SOCAM_PCLK_SAMPLE_FALLING)
> > sens_conf |= 1 << CSI_SENS_CONF_PIX_CLK_POL_SHIFT;
>
>
> --
> Alberto!
>
> Be Persistent!
> - Greg Kroah-Hartman (FOSDEM 2010)
>

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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