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media: stm32-dcmi: add support of BT656 bus 

Add support of BT656 embedded synchronization bus.
This mode allows to save hardware synchro lines hsync & vsync by replacing
them with synchro codes embedded in data stream.
This bus type is only compatible with 8 bits width data bus.
Due to reserved values 0x00 & 0xff used for synchro codes, valid data vary
from 0x1 to 0xfe, this is up to sensor to clip accordingly pixel data. As
a consequence of this clipping, JPEG is not supported with this bus type.
DCMI crop feature is also not available with this bus type.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hugues Fruchet 2020-11-04 18:32:09 +01:00 committed by Mauro Carvalho Chehab
parent e2881c6451
commit 3c80f6f81e
1 changed files with 35 additions and 2 deletions
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37
drivers/media/platform/stm32/stm32-dcmi.c
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@ -157,6 +157,7 @@ struct stm32_dcmi {
struct vb2_queue queue;
struct v4l2_fwnode_bus_parallel bus;
enum v4l2_mbus_type bus_type;
struct completion complete;
struct clk *mclk;
enum state state;
@ -777,6 +778,23 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
if (dcmi->bus.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
val |= CR_PCKPOL;
/*
* BT656 embedded synchronisation bus mode.
*
* Default SAV/EAV mode is supported here with default codes
* SAV=0xff000080 & EAV=0xff00009d.
* With DCMI this means LSC=SAV=0x80 & LEC=EAV=0x9d.
*/
if (dcmi->bus_type == V4L2_MBUS_BT656) {
val |= CR_ESS;
/* Unmask all codes */
reg_write(dcmi->regs, DCMI_ESUR, 0xffffffff);/* FEC:LEC:LSC:FSC */
/* Trig on LSC=0x80 & LEC=0x9d codes, ignore FSC and FEC */
reg_write(dcmi->regs, DCMI_ESCR, 0xff9d80ff);/* FEC:LEC:LSC:FSC */
}
reg_write(dcmi->regs, DCMI_CR, val);
/* Set crop */
@ -1067,8 +1085,9 @@ static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f)
if (ret)
return ret;
/* Disable crop if JPEG is requested */
if (pix->pixelformat == V4L2_PIX_FMT_JPEG)
/* Disable crop if JPEG is requested or BT656 bus is selected */
if (pix->pixelformat == V4L2_PIX_FMT_JPEG &&
dcmi->bus_type != V4L2_MBUS_BT656)
dcmi->do_crop = false;
/* pix to mbus format */
@ -1608,6 +1627,11 @@ static int dcmi_formats_init(struct stm32_dcmi *dcmi)
if (dcmi_formats[i].mbus_code != mbus_code.code)
continue;
/* Exclude JPEG if BT656 bus is selected */
if (dcmi_formats[i].fourcc == V4L2_PIX_FMT_JPEG &&
dcmi->bus_type == V4L2_MBUS_BT656)
continue;
/* Code supported, have we got this fourcc yet? */
for (j = 0; j < num_fmts; j++)
if (sd_fmts[j]->fourcc ==
@ -1891,9 +1915,18 @@ static int dcmi_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "CSI bus not supported\n");
return -ENODEV;
}
if (ep.bus_type == V4L2_MBUS_BT656 &&
ep.bus.parallel.bus_width != 8) {
dev_err(&pdev->dev, "BT656 bus conflicts with %u bits bus width (8 bits required)\n",
ep.bus.parallel.bus_width);
return -ENODEV;
}
dcmi->bus.flags = ep.bus.parallel.flags;
dcmi->bus.bus_width = ep.bus.parallel.bus_width;
dcmi->bus.data_shift = ep.bus.parallel.data_shift;
dcmi->bus_type = ep.bus_type;
irq = platform_get_irq(pdev, 0);
if (irq <= 0)