diff mbox series

[15/18] mfd: stpmic1: Fix swapped mask/unmask in irq chip

Message ID 20221112151835.39059-16-aidanmacdonald.0x0@gmail.com
State New
Headers
Series mfd: Clean up deprecated regmap-irq functionality |

Commit Message

Aidan MacDonald Nov. 12, 2022, 3:18 p.m. UTC 
  The usual behavior of mask registers is writing a '1' bit to
disable (mask) an interrupt; similarly, writing a '1' bit to
an unmask register enables (unmasks) an interrupt.

Due to a longstanding issue in regmap-irq, mask and unmask
registers were inverted when both kinds of registers were
present on the same chip, ie. regmap-irq actually wrote '1's
to the mask register to enable an IRQ and '1's to the unmask
register to disable an IRQ.

This was fixed by commit e8ffb12e7f06 ("regmap-irq: Fix
inverted handling of unmask registers") but the fix is opt-in
via mask_unmask_non_inverted = true because it requires manual
changes for each affected driver. The new behavior will become
the default once all drivers have been updated.

The STPMIC1 has a normal mask register with separate set and
clear registers. The driver intends to use the set & clear
registers with regmap-irq and has compensated for regmap-irq's
inverted behavior, and should currently be working properly.
Thus, swap mask_base and unmask_base, and opt in to the new
non-inverted behavior.

Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
---
 drivers/mfd/stpmic1.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Comments

Lee Jones Nov. 16, 2022, 5:58 p.m. UTC | #1 
On Sat, 12 Nov 2022, Aidan MacDonald wrote:

> The usual behavior of mask registers is writing a '1' bit to
> disable (mask) an interrupt; similarly, writing a '1' bit to
> an unmask register enables (unmasks) an interrupt.
> 
> Due to a longstanding issue in regmap-irq, mask and unmask
> registers were inverted when both kinds of registers were
> present on the same chip, ie. regmap-irq actually wrote '1's
> to the mask register to enable an IRQ and '1's to the unmask
> register to disable an IRQ.
> 
> This was fixed by commit e8ffb12e7f06 ("regmap-irq: Fix
> inverted handling of unmask registers") but the fix is opt-in
> via mask_unmask_non_inverted = true because it requires manual
> changes for each affected driver. The new behavior will become
> the default once all drivers have been updated.
> 
> The STPMIC1 has a normal mask register with separate set and
> clear registers. The driver intends to use the set & clear
> registers with regmap-irq and has compensated for regmap-irq's
> inverted behavior, and should currently be working properly.
> Thus, swap mask_base and unmask_base, and opt in to the new
> non-inverted behavior.
> 
> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
> ---
>  drivers/mfd/stpmic1.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

Applied, thanks.
diff mbox series

Patch

diff --git a/drivers/mfd/stpmic1.c b/drivers/mfd/stpmic1.c
index eb3da558c3fb..ee0469d5d435 100644
--- a/drivers/mfd/stpmic1.c
+++ b/drivers/mfd/stpmic1.c
@@ -108,8 +108,9 @@  static const struct regmap_irq stpmic1_irqs[] = {
 static const struct regmap_irq_chip stpmic1_regmap_irq_chip = {
 	.name = "pmic_irq",
 	.status_base = INT_PENDING_R1,
-	.mask_base = INT_CLEAR_MASK_R1,
-	.unmask_base = INT_SET_MASK_R1,
+	.mask_base = INT_SET_MASK_R1,
+	.unmask_base = INT_CLEAR_MASK_R1,
+	.mask_unmask_non_inverted = true,
 	.ack_base = INT_CLEAR_R1,
 	.num_regs = STPMIC1_PMIC_NUM_IRQ_REGS,
 	.irqs = stpmic1_irqs,