LCM Flicker source cause and solution

Werner Almesberger werner at openmoko.org
Wed Mar 26 13:53:24 CET 2008


Andy Green wrote:
> We finally understood the root cause of the flicker together with most
> of an explanation, and a solution so we are able to go back to hardware
> rotation without flicker.

Greaaat ! Funny, now we understand that LCM better than its makers ;-)

> I also experimented with reducing PCLK in portrait now the flicker was
> gone, but 16MHz (/3) had horizontal artifacts for some reason -- it had

In fix-lcm-flicker.patch, there is

-       { GLAMO_REG_CLOCK_GEN7,         0x0001 }, /* 0101 */
+       { GLAMO_REG_CLOCK_GEN7,         0x0002 }, /* 1 = /2, 2 = /3 */

Did this change slip through unintentionally or did you change your
mind on the artifacts ?

- Werner




More information about the openmoko-kernel mailing list