[PATCH 4/5] arm64: dts: rockchip: Enable HS400 for Indiedroid Nova

[Chris Morgan]

On Thu, Nov 06, 2025 at 12:18:51AM +0100, Heiko Stuebner wrote:
> Am Mittwoch, 5. November 2025, 21:57:07 Mitteleuropäische Normalzeit schrieb Chris Morgan:
> > From: Chris Morgan <macromorgan at hotmail.com>
> > 
> > Once the DLL_STRBIN_TAPNUM_DEFAULT is set to the correct value [1], the
> > workaround to ensure stable eMMC operation is no longer needed. I
> > have observed testing this that hdparm went from:
> > "Timing buffered disk reads: 502 MB in  3.00 seconds = 167.14 MB/sec"
> > to the following:
> > "Timing buffered disk reads: 832 MB in  3.00 seconds = 277.32 MB/sec"
> > 
> > [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/mmc/host/sdhci-of-dwcmshc.c?id=a28352cf2d2f8380e7aca8cb61682396dca7a991
> > 
> > Fixes: 3900160e164b ("arm64: dts: rockchip: Add Indiedroid Nova board")
> 
> This needs the patch you linked to, to actually work, so I'll drop
> the fixes tag when applying, because this should likely not be
> backported to older kernels.
> 
> Same reasoning for patch 5.

Thank you, I wasn't sure about that or not. I can say with certanty
you don't want the eMMC device tree changes prior to that patch going
through or bad things will happen.

Chris

> 
> 
> Heiko
> 
> > Signed-off-by: Chris Morgan <macromorgan at hotmail.com>
> > ---
> >  arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts b/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts
> > index 62c8c8f68713..0796ba6d2504 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts
> > @@ -561,10 +561,10 @@ &saradc {
> >  	status = "okay";
> >  };
> >  
> > -/* HS400 modes seemed to cause io errors. */
> >  &sdhci {
> >  	bus-width = <8>;
> > -	no-mmc-hs400;
> > +	mmc-hs400-1_8v;
> > +	mmc-hs400-enhanced-strobe;
> >  	no-sd;
> >  	no-sdio;
> >  	non-removable;
> > 
> 
> 
> 
>