From: Arnd Bergmann <arnd@arndb.de>
To: lkundrak@v3.sk
Cc: arm-soc <arm@kernel.org>, Olof Johansson <olof@lixom.net>,
Eric Miao <eric.y.miao@gmail.com>,
Haojian Zhuang <haojian.zhuang@gmail.com>,
Russell King - ARM Linux <linux@armlinux.org.uk>,
Robert Jarzmik <robert.jarzmik@free.fr>,
Pavel Machek <pavel@ucw.cz>,
quozl@laptop.org,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 14/20] ARM: mmp/mmp2: use cpu_is_pj4() instead of cpu_is_mmp2()
Date: Wed, 28 Nov 2018 22:34:57 +0100 [thread overview]
Message-ID: <CAK8P3a2=itOMfHax1rpJEUKfBKeU=-hPnn1yA3V4r3Q9Hfhz8g@mail.gmail.com> (raw)
In-Reply-To: <20181128175324.163202-15-lkundrak@v3.sk>
On Wed, Nov 28, 2018 at 6:54 PM Lubomir Rintel <lkundrak@v3.sk> wrote:
>
> The MMP2 platform uses the PJ4 CPU. The cpu_is_mmp2() macro is thus
> actually not useful at all and moreover gives the wrong result on
> MACH_MMP2_DT.
>
> The actual problem I aim to fix is that on a device-tree enabled system,
> the timer ends up being initialized incorrectly. In fact, it ticks like
> at rate that's 1/100 slower or so.
>
> Perhaps the other cpu_is_mmp2() uses are more benign, but still useless.
I think we still need the helper. If it's broken on some platforms,
it has to be fixed instead.
> @@ -104,7 +104,7 @@ void __init mmp2_init_irq(void)
>
> static int __init mmp2_init(void)
> {
> - if (cpu_is_mmp2()) {
> + if (cpu_is_pj4()) {
> #ifdef CONFIG_CACHE_TAUROS2
> tauros2_init(0);
> #endif
> diff --git a/arch/arm/mach-mmp/pm-mmp2.c b/arch/arm/mach-mmp/pm-mmp2.c
> index 17699be3bc3d..bcd5111ffb37 100644
> --- a/arch/arm/mach-mmp/pm-mmp2.c
> +++ b/arch/arm/mach-mmp/pm-mmp2.c
> @@ -220,7 +220,7 @@ static int __init mmp2_pm_init(void)
> {
> uint32_t apcr;
>
> - if (!cpu_is_mmp2())
> + if (!cpu_is_pj4())
> return -EIO;
>
> suspend_set_ops(&mmp2_pm_ops);
These are both regular initcalls. On a multiplatform kernel, they
will be called unconditionally, and the cpu_is_mmp2() has to
guard code that would be wrong on other SoCs, including those
with a pj4 CPU (Armada XP, Dove, Berlin).
> diff --git a/arch/arm/mach-mmp/time.c b/arch/arm/mach-mmp/time.c
> index 96ad1db0b04b..0f49ac579a17 100644
> --- a/arch/arm/mach-mmp/time.c
> +++ b/arch/arm/mach-mmp/time.c
> @@ -163,7 +163,7 @@ static void __init timer_config(void)
>
> __raw_writel(0x0, mmp_timer_base + TMR_CER); /* disable */
>
> - ccr &= (cpu_is_mmp2()) ? (TMR_CCR_CS_0(0) | TMR_CCR_CS_1(0)) :
> + ccr &= (cpu_is_pj4()) ? (TMR_CCR_CS_0(0) | TMR_CCR_CS_1(0)) :
> (TMR_CCR_CS_0(3) | TMR_CCR_CS_1(3));
> __raw_writel(ccr, mmp_timer_base + TMR_CCR);
>
This looks correct, here we just need to ensure we are not on pj1.
Note: we should probably rename 'timer_init' to something that
that has 'mmp' in the name, the current name conflicts with
a function of the same name in mach-davinci, which is not yet
multiplatform, but hopefully will be one day.
Arnd
next prev parent reply other threads:[~2018-11-28 21:35 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-28 17:53 [PATCH v4 0/20] MMP platform fixes Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 01/20] dt-bindings: mrvl,mmp-timer: add clock Lubomir Rintel
2018-11-30 23:10 ` Olof Johansson
2018-11-28 17:53 ` [PATCH v4 02/20] DT: marvell,mmp2: fix the gpio interrupt cell number Lubomir Rintel
2018-11-30 23:11 ` Olof Johansson
2018-11-28 17:53 ` [PATCH v4 03/20] DT: marvell,mmp2: give gpio node a name Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 04/20] DT: marvell,mmp2: add clock to the timer Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 05/20] DT: marvell,mmp2: add MMC controllers Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 06/20] DT: marvell,mmp2: fix TWSI2 Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 07/20] DT: marvell,mmp2: add more TWSI controllers Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 08/20] DT: marvell,mmp2: add OTG PHY Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 09/20] DT: marvell,mmp2: add USB OTG host controller Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 10/20] DT: marvell,mmp2: Add SSP controllers Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 11/20] irqchip/mmp: only touch the PJ4 & FIQ bits on enable/disable Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 12/20] irqchip/mmp: do not use of_address_to_resource() to get mux regs Lubomir Rintel
2018-12-01 12:59 ` Pavel Machek
2018-11-28 17:53 ` [PATCH v4 13/20] gpio: pxa: avoid attempting to set pin direction via pinctrl on MMP2 Lubomir Rintel
2018-11-28 17:53 ` [PATCH v4 14/20] ARM: mmp/mmp2: use cpu_is_pj4() instead of cpu_is_mmp2() Lubomir Rintel
2018-11-28 21:34 ` Arnd Bergmann [this message]
2018-11-28 17:53 ` [PATCH v4 15/20] ARM: mmp2: initialize clocks before the timer Lubomir Rintel
2018-11-30 23:59 ` Olof Johansson
2018-11-28 17:53 ` [PATCH v4 16/20] ARM: mmp/mmp2: dt: enable the clock Lubomir Rintel
2018-11-30 23:59 ` Olof Johansson
2018-11-28 17:53 ` [PATCH v4 17/20] ARM: mmp: add a pxa-usb-phy device Lubomir Rintel
2018-11-30 23:59 ` Olof Johansson
2018-11-28 17:53 ` [PATCH v4 18/20] ARM: mmp: add an instance of pxa-usb-phy to ttc_dkb and aspenite Lubomir Rintel
2018-12-01 0:00 ` Olof Johansson
2018-11-28 17:53 ` [PATCH v4 19/20] USB: phy-mv-usb: use phy-pxa-usb Lubomir Rintel
2018-11-30 23:42 ` Olof Johansson
2018-12-01 13:10 ` Pavel Machek
2018-12-02 19:07 ` Olof Johansson
2018-11-28 17:53 ` [PATCH v4 20/20] USB: gadget: mv-udc: " Lubomir Rintel
2018-11-30 23:42 ` Olof Johansson
2018-11-28 21:39 ` [PATCH v4 0/20] MMP platform fixes Arnd Bergmann
2018-11-28 21:44 ` Pavel Machek
2018-11-30 23:44 ` Olof Johansson
2018-12-02 12:07 ` Lubomir Rintel
2018-12-02 22:29 ` Pavel Machek
2018-12-02 23:24 ` James Cameron
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