linux-kernel - Re: [PATCH AUTOSEL 6.7 044/108] usb: typec: ucsi: fix UCSI on buggy Qualcomm devices

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Date: Wed, 17 Jan 2024 09:04:01 +0100
From: Johan Hovold <johan@...nel.org>
To: Sasha Levin <sashal@...nel.org>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>, gregkh@...uxfoundation.org,
	hdegoede@...hat.com, fabrice.gasnier@...s.st.com,
	quic_jackp@...cinc.com, saranya.gopal@...el.com,
	quic_linyyuan@...cinc.com, andriy.shevchenko@...ux.intel.com,
	minhuadotchen@...il.com, johan+linaro@...nel.org, robh@...nel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.7 044/108] usb: typec: ucsi: fix UCSI on buggy
 Qualcomm devices

On Tue, Jan 16, 2024 at 02:39:10PM -0500, Sasha Levin wrote:
> From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> 
> [ Upstream commit 1d103d6af241dbfc7e11eb9a46dff65db257a37f ]
> 
> On sevral Qualcomm platforms (SC8180X, SM8350, SC8280XP) a call to
> UCSI_GET_PDOS for non-PD partners will cause a firmware crash with no
> easy way to recover from it. Since we have no easy way to determine
> whether the partner really has PD support, shortcut UCSI_GET_PDOS on
> such platforms. This allows us to enable UCSI support on such devices.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
> Link: https://lore.kernel.org/r/20231025115620.905538-2-dmitry.baryshkov@linaro.org
> Signed-off-by: Bjorn Andersson <andersson@...nel.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

Correct me if I'm wrong Dmitry, but while the commit message makes this
sound like a fix, it is not needed unless you backport follow-on patches
that enable UCSI on these platforms.

So this one can be dropped from all stable queues (unless you're
backporting patches that enable new features and that depend on this
one).

Johan