+ Subrata On Tue, 22 Aug 2023 at 15:35, Nico Huber <nic...@gmx.de> wrote:
> Hi Jeremy, > > On 14.08.23 22:52, Compostella, Jeremy wrote: > > We propose to take advantage of a proprietary driver Intel already > supports, validates and includes in FSP silicon: the Intel Graphics PEIM > (Pre-EFI Initialization Module) driver also known as the GOP (Graphical > Output Protocol) driver. > > just to make sure nobody makes wrong assumptions: Will the uGOP be > open-source or proprietary as well? I first thought the latter. But > your proposed code-flow looks like some sort of dynamic linking with > coreboot. > > > We intend to keep providing such a binary base solution on the long run > as it addresses our software convergence goals and is compatible with early > platform development stage constraints. [libgfxinit] supports can always be > added later by the open-source community once the Graphics Programmer > Reference Manuals are published. > > Sad to hear about this decision. It seems Intel is forgetting about > non-consumer products (e.g. embedded market) where the code isn't > needed years ahead of a platform launch. > > > We also noticed that microGOP is faster to bring-up graphics than > libgfxinit. Indeed, according to previously captured numbers on Raptor Lake > compared to some number of microGOP on Meteor Lake, microGOP is three times > faster to bring up graphics than libgfxinit on an eDP panel (119 ms vs 373 > ms). > > Configuring the hardware and bringing up the eDP link should take > about 20~30ms mostly depending on how long it takes to read the > EDID. The longer delays are likely about panel power sequencing. > IIRC, libgfxinit falls back to hardcoded default values if the > sequencer is unconfigured, while the GOP just leaves it like that. > Chromebooks often skip the configuration[1] in firmware and leave > it to the OS driver. Using wrong delays probably doesn't hurt on > a rare interactive boot. However, I guess doing this on regular > boots might not be the best idea. > > Nico > > [1] https://doc.coreboot.org/gfx/display-panel.html > > _______________________________________________ > coreboot mailing list -- coreboot@coreboot.org > To unsubscribe send an email to coreboot-le...@coreboot.org >
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