https://community.nxp.com/t5/i-MX-Processors/V4L2-MEMORY-USERPTR-example-for-iMX8QM/m-p/1159777#M162598 <P>Hi aso</P> <P>&nbsp;</P> <P>one can look at unit tests example :&nbsp;V4L2_MEMORY_USERPTR</P> <P>can be used for i.MX8M, but not with i.MX8QM:</P> <P>&nbsp;</P> <P><A href="https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_v4l2_test/mx8_v4l2_cap_drm.c?h=imx_4.19.35_1.1.0" target="_blank">https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_v4l2_test/mx8_v4l2_cap_drm.c?h=imx_4.19.35_1.1.0</A></P> <P><A href="https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_v4l2_test/mx6s_v4l2_cap_drm.c?h=imx_4.19.35_1.1.0" target="_blank">https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_v4l2_test/mx6s_v4l2_cap_drm.c?h=imx_4.19.35_1.1.0</A></P> <P>&nbsp;</P> <P>Best regards<BR />igor</P> Mon, 28 Sep 2020 01:14:14 GMT igorpadykov 2020-09-28T01:14:14Z https://community.nxp.com/t5/i-MX-Processors/V4L2-MEMORY-USERPTR-example-for-iMX8QM/m-p/1159579#M162577 <P><SPAN>Hello everyone,</SPAN></P><P>&nbsp;</P><P>I'm programming V4L2 <SPAN>&nbsp;</SPAN>using Linux 4.19.35, on an evaluation board <SPAN>MCIMX8QM-CPU</SPAN>.</P><P>The camera uses MX8X MIPI4CAM2.</P><P><BR />So the question is, is it possible to use the V4L2_MEMORY_USERPTR feature of V4L2?<BR />Or, if you have a sample source somewhere, please let me know.</P><P>Currently, I can capture using V4L2_MEMORY_USERPTR, but when I look at the capture screen, it is black. We are currently investigating at what level the black screen is displayed.</P> Sat, 26 Sep 2020 09:19:25 GMT https://community.nxp.com/t5/i-MX-Processors/V4L2-MEMORY-USERPTR-example-for-iMX8QM/m-p/1159579#M162577 aso 2020-09-26T09:19:25Z https://community.nxp.com/t5/i-MX-Processors/V4L2-MEMORY-USERPTR-example-for-iMX8QM/m-p/1159777#M162598 <P>Hi aso</P> <P>&nbsp;</P> <P>one can look at unit tests example :&nbsp;V4L2_MEMORY_USERPTR</P> <P>can be used for i.MX8M, but not with i.MX8QM:</P> <P>&nbsp;</P> <P><A href="https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_v4l2_test/mx8_v4l2_cap_drm.c?h=imx_4.19.35_1.1.0" target="_blank">https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_v4l2_test/mx8_v4l2_cap_drm.c?h=imx_4.19.35_1.1.0</A></P> <P><A href="https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_v4l2_test/mx6s_v4l2_cap_drm.c?h=imx_4.19.35_1.1.0" target="_blank">https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_v4l2_test/mx6s_v4l2_cap_drm.c?h=imx_4.19.35_1.1.0</A></P> <P>&nbsp;</P> <P>Best regards<BR />igor</P> Mon, 28 Sep 2020 01:14:14 GMT https://community.nxp.com/t5/i-MX-Processors/V4L2-MEMORY-USERPTR-example-for-iMX8QM/m-p/1159777#M162598 igorpadykov 2020-09-28T01:14:14Z