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Date:   Wed, 19 Jun 2019 17:04:06 +0200
From:   Greg KH <greg@kroah.com>
To:     Pintu Agarwal <pintu.ping@gmail.com>
Cc:     Fabio Estevam <festevam@gmail.com>, linux-pm@vger.kernel.org,
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        Kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: Re: [IMX] [DRM]: suspend/resume support
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On Wed, Jun 19, 2019 at 07:03:39PM +0530, Pintu Agarwal wrote:
> You can think that the version I am using right now is almost 4.9 itself.
> Upgrading again to higher kernel version is again difficult, also
> customer does not want it.

They don't want a secure and supported kernel over the lifetime of their
device?  That sounds really odd.  Never create a new device using the
4.9.y kernel tree unless you have someone else doing the support for it
(i.e. a SoC vendor that you are paying support from).

good luck!

greg k-h