[PATCH 09/11] usb: dwc2: Skip clock gating on Broadcom SoCs

[Florian Fainelli]

On 6/30/2024 4:36 PM, Stefan Wahren wrote:
> On resume of the Raspberry Pi the dwc2 driver fails to enable
> HCD_FLAG_HW_ACCESSIBLE before re-enabling the interrupts.
> This causes a situation where both handler ignore a incoming port
> interrupt and force the upper layers to disable the dwc2 interrupt line.
> This leaves the USB interface in a unusable state:
> 
> irq 66: nobody cared (try booting with the "irqpoll" option)
> CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W          6.10.0-rc3
> Hardware name: BCM2835
> Call trace:
> unwind_backtrace from show_stack+0x10/0x14
> show_stack from dump_stack_lvl+0x50/0x64
> dump_stack_lvl from __report_bad_irq+0x38/0xc0
> __report_bad_irq from note_interrupt+0x2ac/0x2f4
> note_interrupt from handle_irq_event+0x88/0x8c
> handle_irq_event from handle_level_irq+0xb4/0x1ac
> handle_level_irq from generic_handle_domain_irq+0x24/0x34
> generic_handle_domain_irq from bcm2836_chained_handle_irq+0x24/0x28
> bcm2836_chained_handle_irq from generic_handle_domain_irq+0x24/0x34
> generic_handle_domain_irq from generic_handle_arch_irq+0x34/0x44
> generic_handle_arch_irq from __irq_svc+0x88/0xb0
> Exception stack(0xc1b01f20 to 0xc1b01f68)
> 1f20: 0005c0d4 00000001 00000000 00000000 c1b09780 c1d6b32c c1b04e54 c1a5eae8
> 1f40: c1b04e90 00000000 00000000 00000000 c1d6a8a0 c1b01f70 c11d2da8 c11d4160
> 1f60: 60000013 ffffffff
> __irq_svc from default_idle_call+0x1c/0xb0
> default_idle_call from do_idle+0x21c/0x284
> do_idle from cpu_startup_entry+0x28/0x2c
> cpu_startup_entry from kernel_init+0x0/0x12c
> handlers:
> [<f539e0f4>] dwc2_handle_common_intr
> [<75cd278b>] usb_hcd_irq
> Disabling IRQ #66
> 
> Disabling clock gatling workaround this issue.

Typo: gatling/gating.

> 
> Fixes: 0112b7ce68ea ("usb: dwc2: Update dwc2_handle_usb_suspend_intr function.")
> Link: https://lore.kernel.org/linux-usb/3fd0c2fb-4752-45b3-94eb-42352703e1fd@gmx.net/T/
> Signed-off-by: Stefan Wahren <wahrenst at gmx.net>
> ---
>   drivers/usb/dwc2/params.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
> index 5a1500d0bdd9..66580de52882 100644
> --- a/drivers/usb/dwc2/params.c
> +++ b/drivers/usb/dwc2/params.c
> @@ -23,6 +23,7 @@ static void dwc2_set_bcm_params(struct dwc2_hsotg *hsotg)
>   	p->max_transfer_size = 65535;
>   	p->max_packet_count = 511;
>   	p->ahbcfg = 0x10;
> +	p->no_clock_gating = true;

Could we set this depending upon whether the dwc2 host controller is a 
wake-up source for the system or not?
-- 
Florian
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