linux-kernel - Re: [PATCH v1 4/4] ARM: tegra: Clear EMC interrupts on resume from LP1 on Tegra30+

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Date:   Mon, 19 Nov 2018 22:00:12 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 4/4] ARM: tegra: Clear EMC interrupts on resume from
 LP1 on Tegra30+


On 30/08/2018 19:54, Dmitry Osipenko wrote:
> Two interrupts are raised on resume from LP1 on Tegra30+: first is the
> clock change completed interrupt which is set after updating timing
> configuration, second is DLL alarm interrupt which is set when DLL
> starts re-calibration after being reset. Clear these two interrupts
> in the end of exiting from the self-refresh mode for consistency, that
> will also allow to not receive spurious interrupts in the EMC driver
> after resume from suspend.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  arch/arm/mach-tegra/sleep-tegra30.S | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S
> index 828f6c37afde..78c6e9fb56e7 100644
> --- a/arch/arm/mach-tegra/sleep-tegra30.S
> +++ b/arch/arm/mach-tegra/sleep-tegra30.S
> @@ -26,6 +26,7 @@
>  #include "irammap.h"
>  #include "sleep.h"
>  
> +#define EMC_INTSTATUS			0x0
>  #define EMC_CFG				0xc
>  #define EMC_ADR_CFG			0x10
>  #define EMC_TIMING_CONTROL		0x28
> @@ -44,6 +45,9 @@
>  #define EMC_XM2VTTGENPADCTRL		0x310
>  #define EMC_XM2VTTGENPADCTRL2		0x314
>  
> +#define EMC_CLKCHANGE_COMPLETE_INT	(1 << 4)
> +#define EMC_DLL_ALARM_INT		(1 << 7)
> +
>  #define MC_EMEM_ARB_CFG			0x90
>  
>  #define PMC_CTRL			0x0
> @@ -539,6 +543,9 @@ zcal_done:
>  
>  	emc_timing_update r1, r0
>  
> +	mov	r1, #(EMC_CLKCHANGE_COMPLETE_INT | EMC_DLL_ALARM_INT)
> +	str	r1, [r0, #EMC_INTSTATUS]	@ clear interrupts
> +
>  	/* Tegra114 had dual EMC channel, now config the other one */
>  	cmp	r10, #TEGRA114
>  	bne	__no_dual_emc_chanl
> 

Where are these interrupts enabled? I did not see where they are
enabled. I see that the Tegra24 EMC driver does poll these, but it did
not look like they were enabled. If they are enabled, I wondering if
they should be masked on entering self-refresh?

Cheers
Jon

-- 
nvpublic