topic Re: iMX25 pixel clock in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/iMX25-pixel-clock/m-p/152042#M1334 <HTML><HEAD></HEAD><BODY><P>I tried the calculation from Jacky's post too:</P><P><A href="http://imxcommunity.org/profiles/blogs/linux-framebuffer-driver-calculate-pixel-clock-for-struct-fb" target="_blank">http://imxcommunity.org/profiles/blogs/linux-framebuffer-driver-calculate-pixel-clock-for-struct-fb</A></P><P>which puts a value of 179067. But no luck :(</P><P></P><P>Venkat</P></BODY></HTML> Sat, 07 Apr 2012 06:31:36 GMT Venku 2012-04-07T06:31:36Z iMX25 pixel clock https://community.nxp.com/t5/i-MX-Processors/iMX25-pixel-clock/m-p/152041#M1333 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>I am trying to use an optrex 3.5" LCD with the foll spec:</P><P>refresh rate: 50<BR /> x – resolution: 320<BR /> y –resolution: 240<BR /> pixel clock: 9.8MHz<BR /> left_margin: Horizontal back porch: 68<BR /> right_margin: Horizontal front porch: 20<BR /> upper_margin: Vertical back porch: 2<BR /> lower_margin: Vertical front porch: 2<BR /> hsync_len: HSYNC width: 30<BR /> vsync_len: VSYNC width: 11<BR /> sync; (VERTICAL / HORIZONTAL SYNC HIGH ACTIVE): VERTICAL / HORIZONTAL SYNC Active Low<BR /> vmode; (NON INTERLACED/ INTERLACED / ODD / DOUBLE): NON INTERLACED</P><P>The following changes were made to mxc_modedb.c:</P><P>"LCD_OPTREX", 50, 320, 240, 102040, 68, 20, 2, 2, 30, 11,<BR /> /*FB_SYNC_OE_LOW_ACT,*/<BR /> FB_SYNC_CLK_LAT_FALL,<BR /> FB_VMODE_NONINTERLACED,<BR /> 0,},</P><P>where LCD_OPTREX would be the name i have assigned.</P><P><BR /> Everything works fine (display, apps show up, TS), except that I don't get the splash screen (kernel boot logo)!</P><P>The 102040 value was arrived at by doing a KHZ2PICO(9800) {9.8MHz pixel clock}. Is this wrong?</P><P>Observations:</P></BODY></HTML> Sat, 07 Apr 2012 05:45:43 GMT https://community.nxp.com/t5/i-MX-Processors/iMX25-pixel-clock/m-p/152041#M1333 Venku 2012-04-07T05:45:43Z Re: iMX25 pixel clock https://community.nxp.com/t5/i-MX-Processors/iMX25-pixel-clock/m-p/152042#M1334 <HTML><HEAD></HEAD><BODY><P>I tried the calculation from Jacky's post too:</P><P><A href="http://imxcommunity.org/profiles/blogs/linux-framebuffer-driver-calculate-pixel-clock-for-struct-fb" target="_blank">http://imxcommunity.org/profiles/blogs/linux-framebuffer-driver-calculate-pixel-clock-for-struct-fb</A></P><P>which puts a value of 179067. But no luck :(</P><P></P><P>Venkat</P></BODY></HTML> Sat, 07 Apr 2012 06:31:36 GMT https://community.nxp.com/t5/i-MX-Processors/iMX25-pixel-clock/m-p/152042#M1334 Venku 2012-04-07T06:31:36Z Re: iMX25 pixel clock https://community.nxp.com/t5/i-MX-Processors/iMX25-pixel-clock/m-p/152043#M1335 <HTML><HEAD></HEAD><BODY><P>vga=330 in kernel command line fixed this..</P></BODY></HTML> Thu, 03 May 2012 05:12:37 GMT https://community.nxp.com/t5/i-MX-Processors/iMX25-pixel-clock/m-p/152043#M1335 Venku 2012-05-03T05:12:37Z