linux-kernel - Re: [PATCH 4.19.113 0/3] Fix for long operation cmds busy detection

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Date:   Sun, 19 Apr 2020 18:52:04 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Sowjanya Komatineni <skomatineni@...dia.com>
Cc:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        baolin.wang@...aro.org, kstewart@...uxfoundation.org,
        tglx@...utronix.de, bradleybolen@...il.com, faiz_abbas@...com,
        thierry.reding@...il.com, jonathanh@...dia.com, bbiswas@...dia.com,
        anrao@...dia.com, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH 4.19.113 0/3] Fix for long operation cmds busy detection

On Sun, Apr 19, 2020 at 09:23:39AM -0700, Sowjanya Komatineni wrote:
> 
> On 4/19/20 12:20 AM, Greg KH wrote:
> > External email: Use caution opening links or attachments
> > 
> > 
> > On Fri, Apr 17, 2020 at 12:14:01PM -0700, Sowjanya Komatineni wrote:
> > > This series includes manually backported changes that implements Tegra
> > > specific timeout callback to switch between finite and infinite HW busy
> > > detection wait modes.
> > > 
> > > sdhci-tegra driver patch implements set_timeout callback based on one of
> > > the sdhci host driver patch that refactors sdhci_set_timeout and allows
> > > drivers to call __sdhci_set_timeout with their timeout callback
> > > implementation.
> > > 
> > > Both of these patches are manually backported in this series.
> > Is this a bugfix or a new feature?  I can't tell, but it feels like it's
> > a new feature.  What's wrong with just using the 5.4.y kernel tree?
> > 
> > thanks,
> > 
> > greg k-h
> Ulf recent patches for increased timeout adds capability
> MMC_CAP_NEED_RSP_BUSY for sdhci-tegra as well.
> 
> So, it will always use R1B for R1B type commands so there are no known bugs
> or failures with mmc devices we use on our platforms.

I have no idea what this means, sorry.

> So, we can treat this patch as an improvement for long operation commands
> where HW will wait as long as device is busy.

Ok, so this isn't a regression and can't match the stable kernel rules,
sorry.

greg k-h