fbtft: Use contiguous memory for framebuffer. Add FBTFT_UPDATE IOCTL. #267
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This patch changes the memory allocated for the LCD from paged to contiguous. This allows the memory to be used directly by the GE2D hardware blitter. A new FBTFT_UPDATE IOCTL is added to notify the driver that framebuffer contents have been changed. Without it, GE2D updates go unnoticed.
Additionally, the fix.smem_start variable is set to the physical address of the framebuffer. Previously, it always had a null value.
This patch can be tested with the following program branch that uses GE2D to blit directly to the LCD memory:
https://github.com/OtherCrashOverride/c2screen2lcd/tree/fb