media: atmel: atmel-isc: add checks for limiting frame sizes

When calling the subdev, certain subdev drivers will overwrite the
frame size and adding sizes which are beyond the ISC's capabilities.
Thus we need to ensure the frame size is cropped to the maximum caps.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
index d987a88..02f1d1c 100644 (file)
--- a/drivers/media/platform/atmel/atmel-isc-base.c
+++ b/drivers/media/platform/atmel/atmel-isc-base.c
@@ -1338,6 +1338,12 @@ static int isc_try_fmt(struct isc_device *isc, struct v4l2_format *f,
 
        v4l2_fill_pix_format(pixfmt, &format.format);
 
+       /* Limit to Atmel ISC hardware capabilities */
+       if (pixfmt->width > ISC_MAX_SUPPORT_WIDTH)
+               pixfmt->width = ISC_MAX_SUPPORT_WIDTH;
+       if (pixfmt->height > ISC_MAX_SUPPORT_HEIGHT)
+               pixfmt->height = ISC_MAX_SUPPORT_HEIGHT;
+
        pixfmt->field = V4L2_FIELD_NONE;
        pixfmt->bytesperline = (pixfmt->width * isc->try_config.bpp) >> 3;
        pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
@@ -1373,6 +1379,12 @@ static int isc_set_fmt(struct isc_device *isc, struct v4l2_format *f)
        if (ret < 0)
                return ret;
 
+       /* Limit to Atmel ISC hardware capabilities */
+       if (pixfmt->width > ISC_MAX_SUPPORT_WIDTH)
+               pixfmt->width = ISC_MAX_SUPPORT_WIDTH;
+       if (pixfmt->height > ISC_MAX_SUPPORT_HEIGHT)
+               pixfmt->height = ISC_MAX_SUPPORT_HEIGHT;
+
        isc->fmt = *f;
 
        if (isc->try_config.sd_format && isc->config.sd_format &&