drm/i915: program iCLKIP on Lynx Point
authorEugeni Dodonov <eugeni.dodonov@intel.com>
Wed, 9 May 2012 18:37:26 +0000 (15:37 -0300)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Sat, 19 May 2012 20:39:49 +0000 (22:39 +0200)
commite615efe4b879de87ef6a4192d7e5b0bd0d2e1518
treeae7ad10e862c93c940cf1c1dcb0470c64475288e
parent1f8eeabf2e6f4a6cb5afe9e90d2a705e9709f1a1
drm/i915: program iCLKIP on Lynx Point

The iCLKIP clock is used to drive the VGA pixel clock on the PCH. In order
to do so, it must be programmed to properly do the clock ticks according
to the divisor, phase direction, phase increments and a special auxiliary
divisor for 20MHz clock.

v2: calculate divisor values directly instead of relying on a table.

v3: merged a fix from Ben to properly check for invalid divider values.

Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/intel_display.c