On Thu, Jan 5, 2023 at 1:08 PM Adam Ford <aford173@xxxxxxxxx> wrote: > > On Thu, Jan 5, 2023 at 12:17 PM H. Nikolaus Schaller <hns@xxxxxxxxxxx> wrote: > > > > Hi Adam, > > happy new year! Happy new year to you too! > > > > Am 05.01.2023 um 18:54 schrieb Adam Ford <aford173@xxxxxxxxx>: > > > > I am trying to test the 6.0 kernel on an AM3517-EVM, but I am seeing > > some DMA RX errors: > > > > [ 1.730682] omap_hsmmc 4809c000.mmc: RX DMA channel request failed > > [ 1.738403] omap_hsmmc 480b4000.mmc: RX DMA channel request failed > > > > > > I think I remember there was an issue that more an more devices were switched active by default > > to use DMA until the 32 channels of an OMAP are filled up. Which subsystem is hit by this > > limitation may vary and depends if they are properly disabled on the specific board DTS. > > > > See: https://git.goldelico.com/?p=letux-kernel.git;a=commit;h=048b9bc86b9a080258460c4ab2989660233c4c8c > > > > (I must admit that it is not yet upstreamed). > > > > I tried changing the omap3.dtsi file to use the newer sdhci-omap > > controller instead of the older hsmmc driver since it has support for > > the omap3. > > > > > > This would then only be a workaround but not a solution. > > > > That seemed to fix the issue: > > > > [ 2.141967] omap-dma-engine 48056000.dma-controller: OMAP DMA engine driver > > [ 2.183074] mmc1: SDHCI controller on 480b4000.mmc [480b4000.mmc] > > using External DMA > > [ 2.184631] mmc0: SDHCI controller on 4809c000.mmc [4809c000.mmc] > > using External DMA > > > > Would there be an objection if I migrate the OMAP3.dtsi file to the > > newer driver? I wasn't sure if there was a reason this family was > > being held back from the newer driver. > > > > > > AFAIR Tony wanted to retire the older driver anyways. > > That was my impression and it appears that the AM35x has already correction AM335x (not AM35x) > migrated to it. I wasn't sure what was holding us back. In theory, > we could add the compatible flags to the new driver and mark them as > deprecated so the new driver would work with older device trees if > there was push-back on changing the device trees. I know sometimes > there are concerns about using older device trees and the interaction > with the compatible flags make it a bit more complex. > > adam > > > > > Best regards, > > Nikolaus > >
