Using ioread() to perform draining write buffer is excessive.
Use compact API, mb(), that intended to be used for the case.
It reduces total 14 CPU clocks per interrupt.
Signed-off-by: Peter Oh <p...@qca.qualcomm.com>
---
drivers/net/wireless/ath/ath10k/pci.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/pci.c
b/drivers/net/wireless/ath/ath10k/pci.c
index e6972b0..f1e6980 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -353,10 +353,8 @@ static void ath10k_pci_disable_and_clear_legacy_irq(struct
ath10k *ar)
ath10k_pci_write32(ar, SOC_CORE_BASE_ADDRESS + PCIE_INTR_CLR_ADDRESS,
PCIE_INTR_FIRMWARE_MASK | PCIE_INTR_CE_MASK_ALL);
- /* IMPORTANT: this extra read transaction is required to
- * flush the posted write buffer. */
- (void)ath10k_pci_read32(ar, SOC_CORE_BASE_ADDRESS +
- PCIE_INTR_ENABLE_ADDRESS);
+ /* drain write buffer */
+ mb();
}
static void ath10k_pci_enable_legacy_irq(struct ath10k *ar)
@@ -365,10 +363,8 @@ static void ath10k_pci_enable_legacy_irq(struct ath10k *ar)
PCIE_INTR_ENABLE_ADDRESS,
PCIE_INTR_FIRMWARE_MASK | PCIE_INTR_CE_MASK_ALL);
- /* IMPORTANT: this extra read transaction is required to
- * flush the posted write buffer. */
- (void)ath10k_pci_read32(ar, SOC_CORE_BASE_ADDRESS +
- PCIE_INTR_ENABLE_ADDRESS);
+ /* drain write buffer */
+ mb();
}
static inline const char *ath10k_pci_get_irq_method(struct ath10k *ar)
--
1.9.1
--
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