(adding linux-media to the CC) On Fri, 14 Aug 2009, Stefan Welker wrote: > Hi there, > > Im working with the camera on the A780 Motorola mobile phone which > uses the pxa_camera module to run micron mt9m111 chip. In the chip > documentation there is stated that it is possible to run the chip with > Low-power mode (640 x 512) at 54 Mhz with a framerate of 30 hz. Right > now the Master clock is Limited by some Lines of code in pxa_camera to > 26 Mhz which is lcdclk / 4 then a divisor is calculated which is in > this case 1 . > Im wondering if it is possible at all to get the 30 hz images (Im > trying to do real time image processing with this camera , thus the > latency would benefit a lot from a faster framerate. ) from the chip. > > I already tried to set the mclk to 54 Mhz or 52 Mhz which calculates > the divisor as 0 (dont know if that makes sense) > but it gets the images at 30 hz then, unfortunately theres something > wrong as the images get skewed, and also the U/V data somehow gets > mixed up or something since there are now green stripes in the image. > > Do you think there is a hardware limit that prevents the system from > reading out the camera at 54 Mhz > (or at least 52 Mhz) which would be lcdclk/2 The comment in the driver in mclk_get_divisor() says /* mclk <= ciclk / 4 (27.4.2) */ have you had a look at the datasheet section 27.4.2? Please look at it, then feel free to ask again on the mailing list, if you still have any questions. Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
