https://community.nxp.com/t5/i-MX-Processors/SPI-read-error-in-imx8mm/m-p/1484426#M192177 <P>Hi everyone!,</P><P>I need your help for the SPI read error in linux 4.14.98,</P><P>our system uses the ECSPI between imx8mm evk and FPGA.</P><P>basically, SPI uses 12M clock rate. I can access correctly.</P><P>but in 24M clock rate, I have a shifted or truncated read data.</P><P>The following is a capture in logic analyzer of FPGA internal.&nbsp;</P><P>the correct expected data is 0x11111111 but driver returns the 0x08888888 as shifted and last bit was truncated.</P><P>more detail analyzer of logic stream, there is no failure of CLK, MISO, SS and OE. and logic stream is same that of 12M SPI clock case.</P><P>why does it return the unexpected data?&nbsp;<BR />spi_imx.c is a kernel code of SPI. I was checked but didn't find a clue.</P><P>please help me!&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="SPI-24M.png" style="width: 895px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/185543iBC7578A2E654A965/image-size/large?v=v2&amp;px=999" role="button" title="SPI-24M.png" alt="SPI-24M.png" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">SPI-24M.png</span></span></P> Tue, 05 Jul 2022 07:11:37 GMT justNow 2022-07-05T07:11:37Z https://community.nxp.com/t5/i-MX-Processors/SPI-read-error-in-imx8mm/m-p/1484426#M192177 <P>Hi everyone!,</P><P>I need your help for the SPI read error in linux 4.14.98,</P><P>our system uses the ECSPI between imx8mm evk and FPGA.</P><P>basically, SPI uses 12M clock rate. I can access correctly.</P><P>but in 24M clock rate, I have a shifted or truncated read data.</P><P>The following is a capture in logic analyzer of FPGA internal.&nbsp;</P><P>the correct expected data is 0x11111111 but driver returns the 0x08888888 as shifted and last bit was truncated.</P><P>more detail analyzer of logic stream, there is no failure of CLK, MISO, SS and OE. and logic stream is same that of 12M SPI clock case.</P><P>why does it return the unexpected data?&nbsp;<BR />spi_imx.c is a kernel code of SPI. I was checked but didn't find a clue.</P><P>please help me!&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="SPI-24M.png" style="width: 895px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/185543iBC7578A2E654A965/image-size/large?v=v2&amp;px=999" role="button" title="SPI-24M.png" alt="SPI-24M.png" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">SPI-24M.png</span></span></P> Tue, 05 Jul 2022 07:11:37 GMT https://community.nxp.com/t5/i-MX-Processors/SPI-read-error-in-imx8mm/m-p/1484426#M192177 justNow 2022-07-05T07:11:37Z