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SubjectRe: [PATCH v2 05/15] [media] mtk-mipicsi: get the w/h/bytepwerline for mtk_mipicsi
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Hi, Stu:

On Tue, 2019-04-16 at 17:30 +0800, Stu Hsieh wrote:
> This patch get the w/h/bytepwerline to save in mtk_mipicsi.
>
> Signed-off-by: Stu Hsieh <stu.hsieh@mediatek.com>
> ---
> .../media/platform/mtk-mipicsi/mtk_mipicsi.c | 39 +++++++++++++++++++
> 1 file changed, 39 insertions(+)
>
> diff --git a/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c b/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
> index 16f6bc480f4e..10782fccca79 100644
> --- a/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
> +++ b/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
> @@ -99,6 +99,9 @@ struct mtk_mipicsi_dev {
> u32 id;
> int clk_num;
> struct clk *clk[MIPICSI_CLK];
> + u32 width;
> + u32 height;
> + u32 bytesperline;
> };
>
> #define MTK_MIPICSI_BUS_PARAM (V4L2_MBUS_MASTER | \
> @@ -110,13 +113,36 @@ struct mtk_mipicsi_dev {
> V4L2_MBUS_PCLK_SAMPLE_FALLING | \
> V4L2_MBUS_DATA_ACTIVE_HIGH)
>
> +static u32 get_bytesperline(const u32 fmt, const u32 width)
> +{
> + u32 bytesperline = 0;
> +
> + switch (fmt) {
> + case MEDIA_BUS_FMT_UYVY8_2X8:
> + case MEDIA_BUS_FMT_VYUY8_2X8:
> + case MEDIA_BUS_FMT_YUYV8_2X8:
> + case MEDIA_BUS_FMT_YVYU8_2X8:
> + bytesperline = width * 2U;
> + break;
> + default:
> + break;
> + }
> +
> + return bytesperline;
> +}
> +
> static int mtk_mipicsi_add_device(struct soc_camera_device *icd)
> {
> + struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
> + struct mtk_mipicsi_dev *mipicsi = ici->priv;
> struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
> struct v4l2_subdev_format format = {
> .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> };
> int ret;
> + u32 width;
> + u32 height;
> + u32 fmt;
>
> /* Get width/height info from subdev. Then use them to set register */
> ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &format);
> @@ -125,6 +151,19 @@ static int mtk_mipicsi_add_device(struct soc_camera_device *icd)
> return ret;
> }
>
> + width = format.format.width;
> + height = format.format.height;
> + fmt = format.format.code;
> + mipicsi->bytesperline = get_bytesperline(fmt, width);
> + if ((width == 0U) || (height == 0U) || (mipicsi->bytesperline == 0U)) {

You could check more completely, for example, if the valid range of width is 1 ~ 4095, you could check as:

#define WIDTH_MIN 1
#define WIDTH_MAX 4095

if ((width < WIDTH_MIN) || (width > WIDTH_MAX)) {
/* invalid value */
}

Regards,
CK

> + dev_err(icd->parent, "invalid sub device width/height/bytesperline %d/%d/%d\n",
> + width, height, mipicsi->bytesperline);
> + return -EINVAL;
> + }
> +
> + mipicsi->width = width;
> + mipicsi->height = height;
> +
> /*
> * If power domain was closed before, it will be open.
> * Then clock will be open and register will be set



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