[PATCH v2] phy: exynos5-usbdrd: fix USB 2.0 HS PHY tuning values for Exynos7870

[Łukasz Lebiedziński]

On 4/6/26 15:56, Łukasz Lebiedziński wrote:
> The existing PHYPARAM0 tuning values for Exynos7870 are incorrect,
> causing the USB 2.0 PHY to fail high-speed negotiation and fall back
> to full-speed (12Mbps) operation.
> 
> Fix TXVREFTUNE (transmitter voltage reference) from 14 to 3,
> TXRESTUNE (transmitter impedance) from 3 to 2, and SQRXTUNE
> (squelch threshold) from 6 to 5. Also explicitly set
> TXPREEMPPULSETUNE to 0, which was previously missing from the
> tuning table despite being included in the register mask.
> 
> All values are derived from the vendor kernel for the Samsung
> Galaxy A6 (SM-A600FN), as no public hardware documentation is
> available for the Exynos7870 USB DRD PHY. With these corrections,
> the PHY successfully negotiates high-speed (480Mbps) operation.
> 
> Fixes: 588d5d20ca8d ("phy: exynos5-usbdrd: add exynos7870 USBDRD support")
> Cc: stable at vger.kernel.org
> Tested-by: Kaustabh Chakraborty <kauschluss at disroot.org>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski at oss.qualcomm.com>
> Signed-off-by: Łukasz Lebiedziński <kernel at lvkasz.us>

Friendly ping.

I'd also like to mention that this patch was tested on two devices:
Samsung Galaxy A6 (SM-A600FN) by me and Samsung Galaxy J6 (SM-J600FN)
by Kaustabh Chakraborty <kauschluss at disroot.org>.


Regards,
Łukasz