Hi Stefan and Andrea On Mon, 5 Feb 2024 at 18:50, Stefan Wahren <wahrenst@xxxxxxx> wrote: > > Hi Andrea, > > [add Dave] > > Am 04.02.24 um 07:59 schrieb Andrea della Porta: > > From: Phil Elwell <phil@xxxxxxxxxxxxxxx> > > > > BCM2711 has 4 DMA channels with a 40-bit address range, allowing them > > to access the full 4GB of memory on a Pi 4. > > > > Cc: Phil Elwell <phil@xxxxxxxxxxxxxxx> > > Cc: Maxime Ripard <maxime@xxxxxxxxxx> > > Signed-off-by: Andrea della Porta <andrea.porta@xxxxxxxx> > mainlining isn't that simple by sending just the downstream patches to > the mailing list. In many cases there reasons why this hasn't been > upstreamed yet. > > In my opinion just this feature is worth a separate patch series. In > 2021 i already send an initial version, which tried to implement it in a > cleaner & maintainabler way [1]. In the meantime Dave Stevenson from > Raspberry Pi wrote that he also wanted to work on this. Maybe you want > to work on this together? Yes, I'm looking at reworking Stefan's series to work on Pi4 & Pi5 as it's needed for HDMI audio (and other things) on those platforms which I'm working to upstream. I was getting weirdness from the sdhci block when I was last looking at it, so it was just proving a little trickier than first thought. Hopefully I'll get some time on it in the next couple of weeks. Dave > [1] - > https://lore.kernel.org/linux-arm-kernel/13ec386b-2305-27da-9765-8fa3ad71146c@xxxxxxxx/T/
