From mboxrd@z Thu Jan 1 00:00:00 1970 From: ladis@linux-mips.org (Ladislav Michl) Date: Sun, 7 Jan 2018 20:26:33 +0100 Subject: [PATCH v6 10/10] clocksource: timer-dm: Check prescaler value In-Reply-To: References: <1514887799-24605-1-git-send-email-j-keerthy@ti.com> <1514887799-24605-11-git-send-email-j-keerthy@ti.com> <20180104224713.GA11557@lenoch> Message-ID: <20180107192633.GA19198@lenoch> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Sun, Jan 07, 2018 at 09:26:44PM +0530, Keerthy wrote: > On 1/5/2018 4:17 AM, Ladislav Michl wrote: > > On Tue, Jan 02, 2018 at 03:39:59PM +0530, Keerthy wrote: > > > From: Ladislav Michl > > > > > > Invalid prescaler value is silently ignored. Fix that > > > by returning -EINVAL in such case. As invalid value > > > disabled use of the prescaler, use -1 explicitely for > > > that purpose. > > > > > > Signed-off-by: Ladislav Michl > > > --- > > > drivers/clocksource/timer-dm.c | 3 +++ > > > 1 file changed, 3 insertions(+) > > > > > > diff --git a/drivers/clocksource/timer-dm.c b/drivers/clocksource/timer-dm.c > > > index 60db173..01a9cb0 100644 > > > --- a/drivers/clocksource/timer-dm.c > > > +++ b/drivers/clocksource/timer-dm.c > > > @@ -672,6 +672,9 @@ int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler) > > > if (prescaler >= 0x00 && prescaler <= 0x07) { > > > l |= OMAP_TIMER_CTRL_PRE; > > > l |= prescaler << 2; > > > + } else { > > > + if (prescaler != -1) > > > + return -EINVAL; > > > > Argh... This is actually wrong, as it leaves timer enabled. > > I suggest simply dropping this patch and I'll rethink whole > > approach a bit later (and better). > > Okay. I hope the rest 9 patches work well for you. Yes. I rebased event capture patches on top of this serie (based on linux-next) and will post them during next week for review. Fixed patch will be included (note, it is not really needed for your serie as noone is calling this function). > > > > > } > > > omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); > > > > Sorry for the noise, > > ladis > >