On Fri, Jul 14, 2017 at 11:36:56AM +0200, Arnd Bergmann wrote:
> @@ -1158,7 +1158,8 @@ static void ccdc_configure(struct isp_ccdc_device *ccdc)
> */
> fmt_src.pad = pad->index;
> fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> - if (!v4l2_subdev_call(sensor, pad, get_fmt, NULL, &fmt_src)) {
> + ret = v4l2_subdev_call(sensor, pad, get_fmt, NULL, &fmt_src);
> + if (!ret) {
> fmt_info = omap3isp_video_format_info(fmt_src.format.code);
> depth_in = fmt_info->width;
> }
Is the original code buggy?
media/platform/omap3isp/ispccdc.c
1156 /* Compute the lane shifter shift value and enable the bridge when the
1157 * input format is a non-BT.656 YUV variant.
1158 */
1159 fmt_src.pad = pad->index;
1160 fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
1161 if (!v4l2_subdev_call(sensor, pad, get_fmt, NULL, &fmt_src)) {
1162 fmt_info = omap3isp_video_format_info(fmt_src.format.code);
1163 depth_in = fmt_info->width;
1164 }
If v4l2_subdev_call() then depth_in is zero.
1165
1166 fmt_info = omap3isp_video_format_info(format->code);
1167 depth_out = fmt_info->width;
1168 shift = depth_in - depth_out;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
How do we know that this subtraction doesn't set "shift" to a very high
positive?
1169
1170 if (ccdc->bt656)
1171 bridge = ISPCTRL_PAR_BRIDGE_DISABLE;
1172 else if (fmt_info->code == MEDIA_BUS_FMT_YUYV8_2X8)
1173 bridge = ISPCTRL_PAR_BRIDGE_LENDIAN;
1174 else if (fmt_info->code == MEDIA_BUS_FMT_UYVY8_2X8)
1175 bridge = ISPCTRL_PAR_BRIDGE_BENDIAN;
1176 else
1177 bridge = ISPCTRL_PAR_BRIDGE_DISABLE;
1178
1179 omap3isp_configure_bridge(isp, ccdc->input, parcfg, shift, bridge);
regards,
dan carpenter
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