linux-kernel - Re: [PATCH] HID: hid-sony: Fix DS4 controller reporting rate issues

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Date:	Fri, 31 Jul 2015 09:38:27 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.com>
To:	Frank Praznik <frank.praznik@...il.com>
cc:	Rostislav Pehlivanov <atomnuker@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Frank Praznik <frank.praznik@...rr.com>
Subject: Re: [PATCH] HID: hid-sony: Fix DS4 controller reporting rate
 issues

On Wed, 29 Jul 2015, Frank Praznik wrote:

> > >   This commit removes the cap on the DualShock 4 controller reporting
> > > rate when connected using Bluetooth. The previous value of '0xB0'
> > > capped the rate to only 20.83 Hz which many userspace utilities
> > > mistook as a sign of a bad signal. Since a 'B' and an '8' can look
> > > similar it's possible that someone mistook the one for another.
> > > The new value of '0x80' enables the full 1000 Hz peak reporting
> > > rate that the controller is capable of.
> > > 
> > > Signed-off-by: Rostislav Pehlivanov <atomnuker@...il.com>
> > > ---
> > >   drivers/hid/hid-sony.c | 2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
> > > index ed2f008..3a6b6a9 100644
> > > --- a/drivers/hid/hid-sony.c
> > > +++ b/drivers/hid/hid-sony.c
> > > @@ -1836,7 +1836,7 @@ static void dualshock4_state_worker(struct
> > > work_struct *work)
> > >   	} else {
> > >   		memset(buf, 0, DS4_REPORT_0x11_SIZE);
> > >   		buf[0] = 0x11;
> > > -		buf[1] = 0xB0;
> > > +		buf[1] = 0x80;
> > >   		buf[3] = 0x0F;
> > >   		offset = 6;
> > This got added by Frank in commit fdcf105d3d ("HID: sony: Add Dualshock 4
> > Bluetooth output report formatting"). Adding him to CC to double-check.
> > 
> 
> I had some private communication with Rostislav about this fix and it looks
> good to me.  Back when the original code was written the purpose of that value
> was unknown and 0xB0 seemed to work so that's what ended up being used.  Now
> that we know what it actually does and that 0x80 is a better choice I support
> this patch.
> 
> Acked-by: Frank Praznik <frank.praznik@...il.com>

Thanks. Applied to for-4.3/sony.

-- 
Jiri Kosina
SUSE Labs
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