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authorPaul Ma <magf@bitland.corp-partner.google.com>2020-05-08 14:28:25 +0800
committerPatrick Georgi <pgeorgi@google.com>2020-05-18 07:10:31 +0000
commitd0ded1652927016677e366e2cc8a112a60db251a (patch)
tree8ec7afb4d63cce3838a11dc537cd0174ab0eeade /src/mainboard/facebook
parente8d1bef8cbd78c00065381848030655d34d0ecd3 (diff)
soc/mediatek: dsi: adjust hfp_byte and hbp_byte if too small
If panel has too small hfp or hbp, hfp_byte or hbp_byte may become very small value or negative value. When very small value or negative value is used, the panel will be scrolling or distorted. This patch adjusts their values so that they are greater than the minimum value and keep total of them unchanged. DSI transfer HBP or HFP, There are some extra packet. ex. packet header(4byte) and eof(2byte) and (next)hs packet header(4 byte). the hfp_byte = HFP * BPP - packet header(4byte) and eof(2byte) and (next)hs packet header(4 byte). So the min hfp_byte is 2 when HFP = 4. This is equivalent to the Linux kernel DSI change in: https://chromium-review.googlesource.com/c/chromiumos/third_party/ kernel/+/2186872 BUG=b:144824303 BRANCH=kukui TEST=boot damu board with panel CMN N120ACA-EA1 (12" panel and its hbp only 6), the panel can display without scrolling or distortions. Signed-off-by: Paul Ma <magf@bitland.corp-partner.google.com> Change-Id: I608c01d41ae93c8d5094647bbf3e0ae4a23d814c Reviewed-on: https://review.coreboot.org/c/coreboot/+/41163 Reviewed-by: Hung-Te Lin <hungte@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard/facebook')
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