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Patch to fill in link_m and link_n values based on the EDID detailed timing values for

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pixel_clock and link_clock.

Two undocumented registers 0x6f040 and 0x6f044 correspond to link_m and link_n respectively.
Other two undocumented registers 0x6f030 and 0x6f034 correspond to data_m and data_n respectively.

Calculations are based on the intel_link_compute_m_n from linux kernel.

Currently, the value for 0x6f030 does not come up right with our calculations. Hence, set to
hard-coded value.

Change-Id: I40ff411729d0a61759164c3c1098504973f9cf5e
Reviewed-on: https://gerrit.chromium.org/gerrit/62915
Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>
This commit is contained in:
Furquan Shaikh 2013-07-22 16:18:31 -07:00 • committed by ChromeBot
commit f2bb755567
7 changed files with 98 additions and 27 deletions
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2
src/include/edid.h
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@ -45,6 +45,8 @@ struct edid {
/* used to compute timing for graphics chips. */
unsigned char phsync;
unsigned char pvsync;
unsigned int pixel_clock;
unsigned int link_clock;
unsigned int ha;
unsigned int hbl;
unsigned int hso;