diff options
| author | Furquan Shaikh <furquan@google.com> | 2013-07-22 16:18:31 -0700 |
|---|---|---|
| committer | Patrick Georgi <patrick@georgi-clan.de> | 2013-12-21 08:04:10 +0100 |
| commit | 6b19071ffb89dbb68196b7f3b088d87d4fad9e80 (patch) | |
| tree | cb68ceaff1796a7798288eba1f6472154642b76a /src/mainboard/google/slippy/i915io.c | |
| parent | 3d9b5a29317b9df63698abbcf743ff4d15b2892a (diff) | |
FUI: Fill in link_m and link_n values
... based on the EDID detailed timing values for
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>
Reviewed-on: http://review.coreboot.org/4381
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Diffstat (limited to 'src/mainboard/google/slippy/i915io.c')
| -rw-r--r-- | src/mainboard/google/slippy/i915io.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/src/mainboard/google/slippy/i915io.c b/src/mainboard/google/slippy/i915io.c index 18e0480e13..c1e05472c9 100644 --- a/src/mainboard/google/slippy/i915io.c +++ b/src/mainboard/google/slippy/i915io.c @@ -117,9 +117,14 @@ printk(BIOS_SPEW, "DP_MAX_DOWNSPREAD"); /* undocumented. */ io_i915_write32(0x7e4a0000,0x6f030); - io_i915_write32(0x00800000,0x6f034); - io_i915_write32(0x00021000,0x6f040); - io_i915_write32(0x00080000,0x6f044); + /* io_i915_write32(0x00800000,0x6f034); */ + /* Write to 0x6f030 has to be 0x7e4ayyyy -- First four hex digits are important. + However, with our formula we always see values 0x7e43yyyy (1366 panel) and + 0x7e42yyy (1280 panel) */ + /* io_i915_write32(TU_SIZE(dp->m_n.tu) | dp->m_n.gmch_m,0x6f030); */ + io_i915_write32(dp->m_n.gmch_n,0x6f034); + io_i915_write32(dp->m_n.link_m,0x6f040); + io_i915_write32(dp->m_n.link_n,0x6f044); /* leave as is for now. */ io_i915_write32(dp->htotal,0x6f000); |