i.MX Processors中的主题 Re: imx28 low Wifi Throughput https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391471#M57084 <HTML><HEAD></HEAD><BODY><P>Hi Jay,</P><P></P><P>1. You can set the SDIO clock to 52MHz by doing:</P><P></P><P>.max_clk&nbsp;&nbsp;&nbsp; = 48000000, in the mxs_mmc_platform_data structure inside device.c</P><P></P><P>2. Yes, that's the place where DDR mode is set. You should remove it in the SDIO case</P><P></P><P>3. Yes, you should remove it. Also, I guess you are operating in 4-bit mode, so MMC_CAP_8_BIT_DATA should also be removed.</P><P></P><P>Regards,</P><P></P><P>Fabio Estevam</P></BODY></HTML> Thu, 30 Apr 2015 14:17:28 GMT fabio_estevam 2015-04-30T14:17:28Z imx28 low Wifi Throughput https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391470#M57083 <HTML><HEAD></HEAD><BODY><P>I have large customer who is using the imx28 and the Qualcom/Atheros QCA 6124 wifi module.</P><P></P><P>They are only seeing about 20MBs using iperf.</P><P></P><P>They have a bunch of questions I need help with:</P><P></P><P></P><OL style="list-style-type: decimal;"><LI>Setting of SDIO clock<OL style="list-style-type: lower-alpha;"><LI>How<BR />do we go about setting the SDIO clock ?</LI><LI>Currently<BR />we see the SDIO clock is set to 48 Mhz, how do we set it to maximum (52Mhz) ?</LI><LI>Let<BR />us know the changes to be done for the same.</LI></OL></LI><LI>SDR v/s DDR operation<OL style="list-style-type: lower-alpha;"><LI>We<BR />observe in “linux-2.6.35.3\arch\arm\mach-mx28\device.c” DDR capability is<BR />enabled, i.e. caps has “MMC_CAP_DATA_DDR” bit enabled. (Attached file for<BR />reference).</LI><LI>Is<BR />this the only place where the DDR capability needs to be set.</LI><LI>How<BR />do we verify during transfer if indeed DDR operation is happening ?</LI></OL></LI><LI>SSP2 interface with Wifi<OL style="list-style-type: lower-alpha;"><LI>Based<BR />on discussion with Qualcomm team, DDR mode only applies to memory cards.</LI><LI>How<BR />does iMX take care of setting the interface in SDR/DDR mode ?<UL style="list-style-type: disc;"><LI>If<BR />you refer to the device.c attached, DDR capability is enabled on SSP2.</LI></UL></LI></OL></LI><LI>Bus clock frequency<OL style="list-style-type: lower-alpha;"><LI>We<BR />captured the Wi-Fi SDIO interface signal on our product using Logic analyzer.</LI><LI>During<BR /> bus active state clock frequency is 48MHz and during bus idle state clock<BR />frequency reduces to 6MHz.&nbsp; </LI></OL></LI></OL><P></P><P>Thanks,</P><P></P><P>Jay</P></BODY></HTML> Thu, 30 Apr 2015 05:13:40 GMT https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391470#M57083 thejay 2015-04-30T05:13:40Z Re: imx28 low Wifi Throughput https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391471#M57084 <HTML><HEAD></HEAD><BODY><P>Hi Jay,</P><P></P><P>1. You can set the SDIO clock to 52MHz by doing:</P><P></P><P>.max_clk&nbsp;&nbsp;&nbsp; = 48000000, in the mxs_mmc_platform_data structure inside device.c</P><P></P><P>2. Yes, that's the place where DDR mode is set. You should remove it in the SDIO case</P><P></P><P>3. Yes, you should remove it. Also, I guess you are operating in 4-bit mode, so MMC_CAP_8_BIT_DATA should also be removed.</P><P></P><P>Regards,</P><P></P><P>Fabio Estevam</P></BODY></HTML> Thu, 30 Apr 2015 14:17:28 GMT https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391471#M57084 fabio_estevam 2015-04-30T14:17:28Z Re: imx28 low Wifi Throughput https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391472#M57085 <HTML><HEAD></HEAD><BODY><P>I meant .max_clk = 52000000 ;-)</P></BODY></HTML> Thu, 30 Apr 2015 15:53:28 GMT https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391472#M57085 fabio_estevam 2015-04-30T15:53:28Z Re: imx28 low Wifi Throughput https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391473#M57086 <HTML><HEAD></HEAD><BODY><P>Hi Fabio,</P><P></P><P>where can I set this in the mainline kernel?</P></BODY></HTML> Fri, 03 Jul 2015 06:28:08 GMT https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391473#M57086 jörg_krause 2015-07-03T06:28:08Z Re: imx28 low Wifi Throughput https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391474#M57087 <HTML><HEAD></HEAD><BODY><P>Hi Jörg,</P><P></P><P>We do not set it directly like in 2.6.35.</P><P></P><P>Regards,</P><P></P><P>Fabio Estevam</P></BODY></HTML> Fri, 03 Jul 2015 11:16:01 GMT https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391474#M57087 fabio_estevam 2015-07-03T11:16:01Z Re: imx28 low Wifi Throughput https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391475#M57088 <HTML><HEAD></HEAD><BODY><P>I see! The best matching SDIO clock I can get is 48 MHz. Thanks!</P></BODY></HTML> Mon, 06 Jul 2015 19:51:21 GMT https://community.nxp.com/t5/i-MX-Processors/imx28-low-Wifi-Throughput/m-p/391475#M57088 jörg_krause 2015-07-06T19:51:21Z