Hi Am 16.02.23 um 18:20 schrieb Ville Syrjälä:
On Thu, Feb 16, 2023 at 02:21:43PM +0100, Thomas Zimmermann wrote:Hi Am 16.02.23 um 13:52 schrieb Ville Syrjälä:On Thu, Feb 16, 2023 at 01:03:02PM +0100, Thomas Zimmermann wrote:Hi, thanks for taking a look at the patches. Am 16.02.23 um 12:33 schrieb Gerd Hoffmann:On Wed, Feb 15, 2023 at 05:15:17PM +0100, Thomas Zimmermann wrote:Set the VGA bit for unblanking with macro constants instead of magic values. No functional changes.blank/unblank should work simliar to bochs (see commit 250e743915d4), that is maybe a nice thing to add of you modernize the driver anyway.Yeah, it's the VGA PAS field. [1] But is it really called blanking? PAS controls palette access, but blanking is sounds more like DPMS.Why aren't people just using the normal way of flipping the screen off bit in sequencer register 01?Setting the SD bit in SR01 isn't a bad idea. We can do this as part of enabling/disabling the plane. But for PAS, we don't have a choice. It's one of the bazillion obscure VGA settings and (according to a comment in the source code) we need to update it for compatibility.Well, you do need to enable the palette to see something other that border color. Not sure tha't a very obscure thing :P
Pun intended? :D
On a related note, the code looks pretty sketchy. It just blindly writes to 0x3c0 assuming it is the attribute controller index register. But unless you explicitly reset the flip-flop it could actually be the data write register instead. That could easily happen if the previous access to the attribute controller was a read since reads do not toggle the register role.
Yeah, the attribute controller is *fun* to work with. In the next iteration, I'll probably add a helper to do all this; similar to bochs.
Best regards Thomas
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev
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