21.07.2019 22:40, Sowjanya Komatineni пишет:
> Tegra210 platforms use sc7 entry firmware to program Tegra LP0/SC7 entry
> sequence and sc7 entry firmware is run from COP/BPMP-Lite.
> 
> So, COP/BPMP-Lite still need IRQ function to finish SC7 suspend sequence
> for Tegra210.
> 
> This patch has fix for leaving the COP IRQ enabled for Tegra210 during
> interrupt controller suspend operation.
> 
> Acked-by: Thierry Reding <tred...@nvidia.com>
> Signed-off-by: Sowjanya Komatineni <skomatin...@nvidia.com>
> ---
>  drivers/irqchip/irq-tegra.c | 20 ++++++++++++++++++--
>  1 file changed, 18 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-tegra.c b/drivers/irqchip/irq-tegra.c
> index e1f771c72fc4..851f88cef508 100644
> --- a/drivers/irqchip/irq-tegra.c
> +++ b/drivers/irqchip/irq-tegra.c
> @@ -44,6 +44,7 @@ static unsigned int num_ictlrs;
>  
>  struct tegra_ictlr_soc {
>       unsigned int num_ictlrs;
> +     bool supports_sc7;
>  };
>  
>  static const struct tegra_ictlr_soc tegra20_ictlr_soc = {
> @@ -56,6 +57,7 @@ static const struct tegra_ictlr_soc tegra30_ictlr_soc = {
>  
>  static const struct tegra_ictlr_soc tegra210_ictlr_soc = {
>       .num_ictlrs = 6,
> +     .supports_sc7 = true,
>  };
>  
>  static const struct of_device_id ictlr_matches[] = {
> @@ -67,6 +69,7 @@ static const struct of_device_id ictlr_matches[] = {
>  
>  struct tegra_ictlr_info {
>       void __iomem *base[TEGRA_MAX_NUM_ICTLRS];
> +     const struct tegra_ictlr_soc *soc;
>  #ifdef CONFIG_PM_SLEEP
>       u32 cop_ier[TEGRA_MAX_NUM_ICTLRS];
>       u32 cop_iep[TEGRA_MAX_NUM_ICTLRS];
> @@ -147,8 +150,20 @@ static int tegra_ictlr_suspend(void)
>               lic->cop_ier[i] = readl_relaxed(ictlr + ICTLR_COP_IER);
>               lic->cop_iep[i] = readl_relaxed(ictlr + ICTLR_COP_IEP_CLASS);
>  
> -             /* Disable COP interrupts */
> -             writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);
> +             /*
> +              * AVP/COP/BPMP-Lite is the Tegra boot processor.
> +              *
> +              * Tegra210 system suspend flow uses sc7entry firmware which
> +              * is executed by COP/BPMP and it includes disabling COP IRQ,
> +              * clamping CPU rail, turning off VDD_CPU, and preparing the
> +              * system to go to SC7/LP0.
> +              *
> +              * COP/BPMP wakes up when COP IRQ is triggered and runs
> +              * sc7entry-firmware. So need to keep COP interrupt enabled.
> +              */
> +             if (!lic->soc->supports_sc7)
> +                     /* Disable COP interrupts if SC7 is not supported */

All Tegra SoCs support SC7, hence the 'supports_sc7' and the comment
doesn't sound correct to me. Something like 'firmware_sc7' should suit
better here.

> +                     writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);

Secondly, I'm also not sure why COP interrupts need to be disabled for
pre-T210 at all, since COP is unused. This looks to me like it was
cut-n-pasted from downstream kernel without a good reason and could be
simply removed.

>               /* Disable CPU interrupts */
>               writel_relaxed(~0ul, ictlr + ICTLR_CPU_IER_CLR);
> @@ -339,6 +354,7 @@ static int __init tegra_ictlr_init(struct device_node 
> *node,
>               goto out_unmap;
>       }
>  
> +     lic->soc = soc;
>       tegra_ictlr_syscore_init();
>  
>       pr_info("%pOF: %d interrupts forwarded to %pOF\n",
> 

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