linux-kernel - Re: [PATCH] tty: serial: msm

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Date:   Mon, 20 May 2019 08:03:19 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Jorge Ramirez <jorge.ramirez-ortiz@...aro.org>, agross@...nel.org,
        david.brown@...aro.org, gregkh@...uxfoundation.org
Cc:     jslaby@...e.com, keescook@...omium.org, anton@...msg.org,
        ccross@...roid.com, tony.luck@...el.com,
        linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, khasim.mohammed@...aro.org,
        agsumit@....qualcomm.com
Subject: Re: [PATCH] tty: serial: msm_serial: Fix XON/XOFF

Quoting Jorge Ramirez (2019-05-20 07:58:54)
> On 5/20/19 16:56, Jorge Ramirez wrote:
> > 
> > yeah, semantically confusing msm_reset_dm_count is what really matters:
> > it tells the hardware to only take n bytes (in this case only one) so
> > the others will be ignored
> 
> um after I said this, maybe iowrite32_rep should only be applied to
> uartdm ... what do you think?
> 

Probably. The uartdm hardware typically required words everywhere while
the pre-dm hardware didn't. It's an if condition so it should be OK.

It may be time to remove non-uartdm support from this driver
all-together. From what I recall the only devices that are upstream are
the uartdm ones, so it may be easier to just remove the legacy stuff
that nobody has tested in many years.