linux-kernel - Re: [PATCH] Revert "drm/mipi-dsi: Set the fwnode for mipi_dsi

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Message-ID: <2024102411-handgrip-repayment-f149@gregkh>
Date: Thu, 24 Oct 2024 12:23:20 +0200
From: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To: Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"saravanak@...gle.com" <saravanak@...gle.com>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Seiya Wang (王迺君) <seiya.wang@...iatek.com>,
	Singo Chang (張興國) <Singo.Chang@...iatek.com>
Subject: Re: [PATCH] Revert "drm/mipi-dsi: Set the fwnode for mipi_dsi_device"

On Thu, Oct 24, 2024 at 10:16:05AM +0000, Jason-JH Lin (林睿祥) wrote:
> Hi Greg,
> 
> Thanks for your information.
> 
> On Thu, 2024-10-24 at 11:47 +0200, Greg KH wrote:
> >  	 
> > External email : Please do not click links or open attachments until
> > you have verified the sender or the content.
> >  On Thu, Oct 24, 2024 at 05:37:13PM +0800, Jason-JH.Lin via B4 Relay
> > wrote:
> > > From: "Jason-JH.Lin" <jason-jh.lin@...iatek.com>
> > > 
> > > This reverts commit ac88a1f41f93499df6f50fd18ea835e6ff4f3200.
> > > 
> > > Reason for revert:
> > > 1. The commit [1] does not land on linux-5.15, so this patch does
> > not
> > > fix anything.
> > > 
> > > 2. Since the fw_device improvements series [2] does not land on
> > > linux-5.15, using device_set_fwnode() causes the panel to flash
> > during
> > > bootup.
> > > 
> > > Incorrect link management may lead to incorrect device
> > initialization,
> > > affecting firmware node links and consumer relationships.
> > > The fwnode setting of panel to the DSI device would cause a DSI
> > > initialization error without series[2], so this patch was reverted
> > to
> > > avoid using the incomplete fw_devlink functionality.
> > > 
> > > [1] commit 3fb16866b51d ("driver core: fw_devlink: Make cycle
> > detection more robust")
> > > [2] Link: 
> > https://lore.kernel.org/all/20230207014207.1678715-1-saravanak@google.com
> > > 
> 
> Please don't mind me make a confirmation.
> I just need to add this line here and send it again, right?
> 
> Cc: <stable@...r.kernel.org> #5.15.169

Yes.