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authorKen Chang <kenc@nvidia.com>2014-04-18 13:52:48 +0800
committerMarc Jones <marc.jones@se-eng.com>2014-12-17 01:07:53 +0100
commitcbae0de7b91e723d11926cf24acef6b7389257ea (patch)
tree370cc40a1664b0b94ede875deb0afe632f665b3b /util/kconfig
parent43e925252ab0df6539c993557cb1526ae2337cd1 (diff)
downloadcoreboot-cbae0de7b91e723d11926cf24acef6b7389257ea.tar.xz
tegra124: change PLLD VCO calculation algorithm
The current algo sets dc shift clock divider to 5 and PLLD DIVP to 0, this is causing VCO out of the characterized range for some panels. This CL changes the dc shift clock divider to 1 and calculates a proper DIVP to have the VCO inside the characterized range, i.e., 500MHz ~ 1000MHz. BRANCH=none BUG=none TEST=Verify on below panels the pixel clock frequencies are correct. 1. AUO B133XTN01.3 (69.5 MHz) pixelclk(MHz), pll_d(MHz), m/n/p without: 69.5 695 12/695/0 with: 69.5 139 3/139/2 2. AUO B140HTT01.0 (141 MHz) pixelclk(MHz), pll_d(MHz), m/n/p without: VCO (1410000000) out of range. Cannot support. with: 141 282 2/94/1 3. LG LP140WH8 (76.32 MHz) pixelclk(MHz), pll_d(MHz), m/n/p without: 76.32 763.2 5/381/0 with: 76.3125 152.625 8/407/2 4. N116BGE-EA2 (76.42 MHz) pixelclk(MHz), pll_d(MHz), m/n/p without: 76.40 764 3/191/0 with: 76.375 152.75 12/611/2 Original-Change-Id: Id4b3a4865acde37a97d7346ec88406f5237304eb Original-Signed-off-by: Ken Chang <kenc@nvidia.com> Original-Reviewed-on: https://chromium-review.googlesource.com/195534 Original-Reviewed-by: Hung-Te Lin <hungte@chromium.org> (cherry picked from commit 1b56566786aa86c14f691fa3858b878f27b6b4de) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: Ia9de93420e60323f143a42db842febdd3706fe44 Reviewed-on: http://review.coreboot.org/7773 Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org> Tested-by: build bot (Jenkins)
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