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Bluetooth: btintel_pcie: clear the GP0 cause with a W1C write

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MSIX_HW_INT_CAUSES is a write-one-to-clear register. Using a
read-modify-write helper writes zero to GP0, leaving the cause uncleared,
and can acknowledge unrelated pending causes through the read value.

Write only the GP0 bit directly, matching the interrupt handler's W1C
acknowledgment convention.

Fixes: 88c6216a52 ("Bluetooth: btintel_pcie: Suspend/Resume: Controller doorbell interrupt handling")
Signed-off-by: Ravindra <ravindra@intel.com>
Tested-by: Sergey Lebedev <lsa.uz@pm.me>
Reviewed-by: Sergey Lebedev <lsa.uz@pm.me>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Ravindra 2026-09-28 22:40:03 +05:30 committed by Luiz Augusto von Dentz
parent 4f6ead67b9
commit f2cee6e2aa
1 changed files with 6 additions and 4 deletions
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10
drivers/bluetooth/btintel_pcie.c
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@ -4234,10 +4234,12 @@ static int btintel_pcie_set_dxstate(struct btintel_pcie_data *data, u32 dxstate)
"Timeout (%u ms) on alive interrupt for D%d entry, retry count %d",
dx_intr_timeout_ms, dxstate, retry);
/* clear gp0 cause */
btintel_pcie_clr_reg_bits(data,
BTINTEL_PCIE_CSR_MSIX_HW_INT_CAUSES,
BTINTEL_PCIE_MSIX_HW_INT_CAUSES_GP0);
/* MSIX_HW_INT_CAUSES is W1C. Write only GP0 so other
* pending causes are not acknowledged here.
*/
btintel_pcie_wr_reg32(data,
BTINTEL_PCIE_CSR_MSIX_HW_INT_CAUSES,
BTINTEL_PCIE_MSIX_HW_INT_CAUSES_GP0);
}
/* gp0_received is set at the top of the handler, before the switch on