Re: [PATCH] remoteproc: qcom: q6v5: Make handover IRQ one-shot

[Shawn Guo <shengchao.guo@oss.qualcomm.com>]

On Fri, Jun 12, 2026 at 02:09:08PM +0300, Abel Vesa wrote:
> The handover interrupt is expected to be consumed once during each prepare
> cycle. If the remote processor keeps signalling handover after the first
> event, qcom_q6v5 currently logs the duplicate interrupt repeatedly while
> leaving the IRQ enabled.
> 
> Track the handover IRQ enable state explicitly and route all handover IRQ
> enable/disable operations through idempotent helpers. Request the handover
> IRQ with IRQF_NO_AUTOEN so it is only enabled through the helper during
> prepare. The handover handler disables it after marking handover as issued,
> while unprepare disables and synchronizes it before checking whether
> handover was issued.
> 
> Signed-off-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
> ---
>  drivers/remoteproc/qcom_q6v5.c | 54 ++++++++++++++++++++++++++++++++++--------
>  drivers/remoteproc/qcom_q6v5.h |  4 ++++
>  2 files changed, 48 insertions(+), 10 deletions(-)

I seem to see a "regression" on Nord ADSP (probed as attached) with this change.

Before the change:

root@iq10-rrd:~# cat /sys/class/remoteproc/remoteproc0/state
attached
root@iq10-rrd:~# echo stop > /sys/class/remoteproc/remoteproc0/state
[   28.005204] qcom_q6v5_pas 4c00000.remoteproc: Handover signaled, but it already happened
[   28.036754] remoteproc remoteproc0: stopped remote processor adsp
root@iq10-rrd:~# echo start > /sys/class/remoteproc/remoteproc0/state
[   33.603101] remoteproc remoteproc0: powering up adsp
[   33.626128] remoteproc remoteproc0: Booting fw image qcom/nord/adsp.mbn, size 8241816
[   33.640317] PDM: no support for the platform, userspace daemon might be required.
[   33.724070] remoteproc remoteproc0: remote processor adsp is now up

After the change:

root@iq10-rrd:~# cat /sys/class/remoteproc/remoteproc0/state
attached
root@iq10-rrd:~# echo stop > /sys/class/remoteproc/remoteproc0/state
[   40.004874] genpd genpd:0:4c00000.remoteproc: Runtime PM usage count underflow!
[   40.012409] genpd genpd:1:4c00000.remoteproc: Runtime PM usage count underflow!
[   40.050074] remoteproc remoteproc0: stopped remote processor adsp
root@iq10-rrd:~# echo start > /sys/class/remoteproc/remoteproc0/state
[   44.350298] remoteproc remoteproc0: powering up adsp
[   44.375769] remoteproc remoteproc0: Booting fw image qcom/nord/adsp.mbn, size 8241816
[   44.389850] PDM: no support for the platform, userspace daemon might be required.
[   44.397864] ------------[ cut here ]------------
[   44.402633] Unbalanced enable for IRQ 363
[   44.406779] WARNING: kernel/irq/manage.c:775 at __enable_irq+0x4c/0x7c, CPU#9: sh/791
[   44.414837] Modules linked in: bluetooth ecdh_generic kpp ecc usb_f_fs libcomposite qcom_pd_mapper rpmsg_ctrl fastrpc rpmsg_char qrtr_smd qcom_pdr_msg qrtr qcom_q6v5_pas qcom_pil_info rtc_rv8803 phy_nxp_ptn3222 qcom_q6v5 phy_qcom_qmp_combo qcom_sysmon aux_bridge qcom_common i2c_qcom_geni spi_geni_qcom drm_kms_helper qcom_glink_smem typec mdt_loader qmi_helpers phy_snps_eusb2 qcom_cpucp_mbox qcom_wdt qcom_rng socinfo qcomtee cfg80211 rfkill fuse drm backlight
[   44.456498] CPU: 9 UID: 0 PID: 791 Comm: sh Not tainted 7.2.0-rc5-next-20260729+ #114 PREEMPT
[   44.465363] Hardware name: Qualcomm Technologies, Inc. IQ10 RRD (DT)
[   44.471910] pstate: 614000c5 (nZCv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
[   44.479075] pc : __enable_irq+0x4c/0x7c
[   44.483043] lr : __enable_irq+0x4c/0x7c
[   44.487010] sp : ffff80008688bae0
[   44.490434] x29: ffff80008688bae0 x28: ffff00080bf1d000 x27: ffff000806285528
[   44.497784] x26: ffff000806285000 x25: ffff0008136ac600 x24: ffff0008136ac440
[   44.505134] x23: ffff000806285518 x22: 0000000000000001 x21: 0000000000000000
[   44.512485] x20: 000000000000016b x19: ffff00080c8e1000 x18: 0000000000000006
[   44.519835] x17: 0000000000000018 x16: ffffd80886bb74b4 x15: ffff80008688b4f0
[   44.527185] x14: 0000000000000000 x13: ffff008f3874c000 x12: 00000000000002fa
[   44.534536] x11: 00000000000008ee x10: ffff008f387fc000 x9 : ffff008f3874c000
[   44.541887] x8 : 3fffffffffffdfff x7 : ffff008f387fc000 x6 : bfffffffffffe000
[   44.549238] x5 : ffff008f3891a188 x4 : 0000000000000000 x3 : ffff2886b057d000
[   44.556589] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00080bf1d000
[   44.563939] Call trace:
[   44.566485]  __enable_irq+0x4c/0x7c (P)
[   44.570454]  enable_irq+0x6c/0xd8
[   44.573879]  qcom_q6v5_prepare+0xb8/0x118 [qcom_q6v5]
[   44.579087]  qcom_pas_start+0x30/0x418 [qcom_q6v5_pas]
[   44.584392]  rproc_start+0x88/0x1b8
[   44.588004]  rproc_boot+0x194/0x3b4
[   44.591613]  state_store+0x40/0x104
[   44.595220]  dev_attr_store+0x18/0x2c
[   44.599006]  sysfs_kf_write+0x7c/0x94
[   44.602792]  kernfs_fop_write_iter+0x130/0x1dc
[   44.607379]  vfs_write+0x240/0x370
[   44.610906]  ksys_write+0x70/0x108
[   44.614430]  __arm64_sys_write+0x1c/0x28
[   44.618486]  invoke_syscall+0x54/0x10c
[   44.622370]  el0_svc_common.constprop.0+0x40/0xe0
[   44.627228]  do_el0_svc+0x1c/0x28
[   44.630655]  el0_svc+0x38/0x1d0
[   44.633908]  el0t_64_sync_handler+0xa0/0xe4
[   44.638233]  el0t_64_sync+0x198/0x19c
[   44.642025] ---[ end trace 0000000000000000 ]---
[   44.708474] remoteproc remoteproc0: remote processor adsp is now up

Shawn