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SubjectRe: [PATCH v2 2/9] remoteproc: mediatek: Support hanlding scp core 1 wdt timeout
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Hi Mathieu,

> Hi Tinghan,
>
> I have started reviewing this set and I expect comments to be spread out over a few
> days. I will tell you when I am done.
>
> Please see below for comments...
>
> On Wed, Jun 08, 2022 at 04:35:46PM +0800, Tinghan Shen wrote:
> > MT8195 SCP is a dual-core processor. The SCP core 1 watchdog timeout
> > interrupt uses the same interrupt line of SCP core 0 watchdog timeout
> > interrupt.
> >
> > Add support for handling SCP core 1 watchdog timeout interrupt in the
> > SCP IRQ handler.
> >
> > Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
> > ---
> > drivers/remoteproc/mtk_common.h | 4 ++++
> > drivers/remoteproc/mtk_scp.c | 27 ++++++++++++++++++++++++++-
> > 2 files changed, 30 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> > index ea6fa1100a00..73e8adf00de3 100644
> > --- a/drivers/remoteproc/mtk_common.h
> > +++ b/drivers/remoteproc/mtk_common.h
> > @@ -54,6 +54,10 @@
> > #define MT8192_CORE0_WDT_IRQ 0x10030
> > #define MT8192_CORE0_WDT_CFG 0x10034
> >
> > +#define MT8195_SYS_STATUS 0x4004
> > +#define MT8195_CORE0_WDT BIT(16)
> > +#define MT8195_CORE1_WDT BIT(17)
> > +
> > #define MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS GENMASK(7, 4)
> >
> > #define SCP_FW_VER_LEN 32
> > diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> > index 47b2a40e1b4a..3510c6d0bbc8 100644
> > --- a/drivers/remoteproc/mtk_scp.c
> > +++ b/drivers/remoteproc/mtk_scp.c
> > @@ -212,6 +212,31 @@ static void mt8192_scp_irq_handler(struct mtk_scp *scp)
> > }
> > }
> >
> > +static void mt8195_scp_irq_handler(struct mtk_scp *scp)
> > +{
> > + u32 scp_to_host;
> > +
> > + scp_to_host = readl(scp->reg_base + MT8192_SCP2APMCU_IPC_SET);
> > +
> > + if (scp_to_host & MT8192_SCP_IPC_INT_BIT) {
> > + scp_ipi_handler(scp);
> > +
> > + /*
> > + * SCP won't send another interrupt until we clear
> > + * MT8192_SCP2APMCU_IPC.
> > + */
> > + writel(MT8192_SCP_IPC_INT_BIT,
> > + scp->reg_base + MT8192_SCP2APMCU_IPC_CLR);
> > + } else {
> > + if (readl(scp->reg_base + MT8195_SYS_STATUS) & MT8195_CORE1_WDT) {
> > + writel(1, scp->reg_base + MT8195_CORE1_WDT_IRQ);
> > + } else {
> > + writel(1, scp->reg_base + MT8192_CORE0_WDT_IRQ);
> > + scp_wdt_handler(scp, scp_to_host);
>
> Why is scp_wdt_handler() not called when CORE1 signals a watchdog failure? If
> this is the intended behaviour there is no way for anyone but you to know that
> it is the case.

It's becuase the handler of CORE1 timeout doesn't exist at this patch.
The CORE1 timeout handler is added at patch 7 of this series.

You're right. This makes people confused.
I'll combine this patch with the CORE1 timeout handler.

Best regards,
TingHan

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