linux-kernel - Re: [PATCH] mfd: omap-usb-tll: Fix inverted bit use for USB TLL mode

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Date:   Tue, 11 Apr 2017 08:18:49 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Roger Quadros <rogerq@...com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Samuel Ortiz <sameo@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Marcel Partap <mpartap@....net>,
        Michael Scott <michael.scott@...aro.org>,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH] mfd: omap-usb-tll: Fix inverted bit use for USB TLL mode

* Roger Quadros <rogerq@...com> [170411 00:31]:
> Hi Tony,
> 
> On 11/04/17 03:15, Tony Lindgren wrote:
> > Commit 16fa3dc75c22 ("mfd: omap-usb-tll: HOST TLL platform driver")
> > added support for USB TLL, but uses OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
> > bit the wrong way. The comments in the code are mostly correct, but the
> > inverted use of OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF causes the register
> > to be enabled instead of disabled like the comments say. And the
> > idle mode should be only disabled for UTMIAUTOIDLE while ULPIAUTOIDLE
> > can be enabled.
> > 
> > This matches the TLL_CHANNEL_CONF_i register configuration for ehci-tll
> > in the Motorola Linux kernel tree for Wrigley 3G LTE modem on droid 4.
> > Without this patch the modem can only be pinged few times before it
> > stops responding. Also lsub -v output shows errors without this patch.
> 
> This patch does 2 things.
> - Fixes the bad commit by correctly disabling Bitstuffing
> - Enables ULPI Autoidle.
> 
> Is enabling ULPI autoidle required to fix the LTE modem issue? If not I'd put it
> in a separate patch.

No but it presumably saves some power. I'll resend as to patches.

Regards,

Tony