When `QUIRK_AUTO_CLEAR_INT` isn't set, interrupt masking should be
cleared by writing to Interrupt Mask Clear (IMR) and interrupt
status should be cleared properly at shutdown/init.
This fixes an error where interrupts are left enabled during resume
from hibernation with `CONFIG_USB4=y`.
Fixes: 468c49f44759 ("thunderbolt: Disable interrupt auto clear for rings")
Reported-by: Takashi Iwai <tiwai@xxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217343
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Tested-by: Takashi Iwai <tiwai@xxxxxxx>
---
I tried to base this off thunderbolt.git/next (tag: thunderbolt-for-v6.4-rc1)
but the following 3 commits are missing from that branch but are in 6.3-rc7:
58cdfe6f58b3 thunderbolt: Rename shadowed variables bit to interrupt_bit and auto_clear_bit
468c49f44759 thunderbolt: Disable interrupt auto clear for rings
1716efdb0793 thunderbolt: Use const qualifier for `ring_interrupt_index`
I cherry picked them first as this patch builds on them.
---
drivers/thunderbolt/nhi.c | 28 +++++++++++++++++++++-------
drivers/thunderbolt/nhi_regs.h | 1 +
2 files changed, 22 insertions(+), 7 deletions(-)
diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index d76e923fbc6a..7c543a6a5711 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -61,8 +61,9 @@ static int ring_interrupt_index(const struct tb_ring *ring)
*/
static void ring_interrupt_active(struct tb_ring *ring, bool active)
{
- int reg = REG_RING_INTERRUPT_BASE +
- ring_interrupt_index(ring) / 32 * 4;
+ int index = ring_interrupt_index(ring) / 32 * 4;
+ int reg = REG_RING_INTERRUPT_BASE + index;
+ int clear = REG_RING_INTERRUPT_MASK_CLEAR_BASE + index;
int interrupt_bit = ring_interrupt_index(ring) & 31;
int mask = 1 << interrupt_bit;
u32 old, new;
@@ -123,7 +124,11 @@ static void ring_interrupt_active(struct tb_ring *ring, bool active)
"interrupt for %s %d is already %s\n",
RING_TYPE(ring), ring->hop,
active ? "enabled" : "disabled");
- iowrite32(new, ring->nhi->iobase + reg);
+
+ if (active)
+ iowrite32(new, ring->nhi->iobase + reg);
+ else
+ iowrite32(mask, ring->nhi->iobase + clear);
}
/*
@@ -135,12 +140,21 @@ static void nhi_disable_interrupts(struct tb_nhi *nhi)
{
int i = 0;
/* disable interrupts */
- for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++)
- iowrite32(0, nhi->iobase + REG_RING_INTERRUPT_BASE + 4 * i);
+ for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++) {
+ if (nhi->quirks & QUIRK_AUTO_CLEAR_INT)
+ iowrite32(0, nhi->iobase + REG_RING_INTERRUPT_BASE + 4 * i);
+ else
+ iowrite32(0xffffffff,
+ nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + 4 * i);
+ }
/* clear interrupt status bits */
- for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++)
- ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + 4 * i);
+ for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++) {
+ if (nhi->quirks & QUIRK_AUTO_CLEAR_INT)
+ ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + 4 * i);
+ else
+ iowrite32(0xffffffff, nhi->iobase + REG_RING_INT_CLEAR + 4 * i);
+ }
}
/* ring helper methods */
diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h
index faef165a919c..db95ad5d2814 100644
--- a/drivers/thunderbolt/nhi_regs.h
+++ b/drivers/thunderbolt/nhi_regs.h
@@ -92,6 +92,7 @@ struct ring_desc {
*/
#define REG_RING_INTERRUPT_BASE 0x38200
#define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
+#define REG_RING_INTERRUPT_MASK_CLEAR_BASE 0x38208
#define REG_INT_THROTTLING_RATE 0x38c00
--
2.34.1
