From: Krzysztof Helt Date: Thu, 16 Oct 2008 05:03:42 +0000 (-0700) Subject: cirrusfb: do not change MCLK for Alpine chips X-Git-Tag: v2.6.28-rc1~388 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=486ff387c0f27030a3cfb142469ba140f2d8976e;p=pandora-kernel.git cirrusfb: do not change MCLK for Alpine chips A memory clock value (MCLK) is changed to a minimum required by a current mode bandwidth. This usually lowers the MCLK to its minimum (50 MHz) thus decreasing the card performance. Just leave the MCLK value set by card BIOS. The CL-GD5446 Technical Reference Manual point 9.9.1.3 states that if a pixclock value is close (~1%) to the MCLK or MCLK/2 this may result in a jitter on the screen. A countermeasure is to use the MCLK as pixclock source instead of a VCLK. The patch implements this as well. Signed-off-by: Krzysztof Helt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed