Re: [PATCH v2 3/3] sh: dma: Correct the number of DMA channels in SH7709

[John Paul Adrian Glaubitz]

Hi Geert!

On Thu, 2023-06-08 at 12:03 +0200, John Paul Adrian Glaubitz wrote:
> > > > That is actually safer, as the user can override NR_ONCHIP_DMA_CHANNELS
> > > > when configuring his kernel, thus breaking DMA  due to an incorrect
> > > > value of SH_DMAC_NR_MD_CH.
> > > > 
> > > > Unfortunately we cannot protect against that when using a single DMAC,
> > > > as SH_DMAC_NR_MD_CH can be either 4, 6, or 8.
> > > > 
> > > > Perhaps this configuration should be moved from Kconfig to <cpu/dma.h>,
> > > > to protect against a user overriding this value?
> > > 
> > > Isn't SH_DMAC_NR_MD_CH already hardwired to the SoC being used?
> > 
> > It depends on CONFIG_NR_ONCHIP_DMA_CHANNELS, while it
> > should be fixed based on the SoC.
> 
> I agree. However, I would be fine with merging this patch set first and fixing
> this particular issue in a follow-up series.

So, my suggestion is to take this series as-is for 6.5, then get the other issues
you mentioned fixed for 6.6. I think it's already a gain when these issues are
fixed and the kernel boots on the HP Journada 680 again.

Adrian

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