Hello Boris, > From: Boris Brezillon <boris.brezillon@xxxxxxxxxxx> > Sent: 15 November 2018 10:16 > Subject: Re: [PATCH v3] drm/bridge/sii902x: Fix EDID readback > > On Thu, 15 Nov 2018 11:13:52 +0100 > Linus Walleij <linus.walleij@xxxxxxxxxx> wrote: > > > On Tue, Nov 6, 2018 at 12:52 PM Fabrizio Castro > > <fabrizio.castro@xxxxxxxxxxxxxx> wrote: > > > > > While adding SiI9022A support to the iwg23s board, it came > > > up that when the HDMI transmitter is in pass through mode the > > > device is not compliant with the I2C specification anymore, > > > as it requires a far bigger tbuf, due to a delay the HDMI > > > transmitter is adding when relaying the STOP condition on the > > > monitor i2c side of things. > > > > > > When not providing an appropriate delay after the STOP condition > > > the i2c bus would get stuck. Also, any other traffic on the bus > > > while talking to the monitor may cause the transaction to fail > > > or even cause issues with the i2c bus as well. > > > > > > I2c-gates seemed to reach consent as a possible way to address > > > these issues, and as such this patch is implementing a solution > > > based on that. Since others are clearly relying on the current > > > implementation of the driver, this patch won't require any DT > > > changes. > > > > > > Since we don't want any interference during the DDC Bus > > > Request/Grant procedure and while talking to the monitor, we > > > have to use the adapter locking primitives rather than the > > > i2c-mux locking primitives. > > > > > > Signed-off-by: Fabrizio Castro <fabrizio.castro@xxxxxxxxxxxxxx> > > > > > > --- > > > v2->v3: > > > * Incorporated comments from Boris Brezillon and Peter Rosin > > > > Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx> > > > > Do you need help to apply this to drm-misc or do you > > have commit access? > > I can do it if needed. Yes, please, your help is very much appreciated. Thanks, Fab Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales under Registered No. 04586709.
