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[1/3] ath11k: Split PCI write/read functions

Message ID 20210913180902.193874-2-jouni@codeaurora.org (mailing list archive)
State Changes Requested
Delegated to: Kalle Valo
Headers show
Series ath11k: Add support for sram dump | expand

Commit Message

Jouni Malinen Sept. 13, 2021, 6:09 p.m. UTC 
From: Baochen Qiang <bqiang@codeaurora.org>

ath11k_pci_write32/read32 tries to wake up MHI before doing actual
write/read work, which means each time a u32 is written/read, MHI
wake up is performed. This is not necessary in case where we do a
large amount of write/read, cause only one time of wake up is needed.
So split each one into two parts, the first part does MHI get/put
and the second one does actual write/read work.

Also avoid the put operation if the previous get operation fails.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1

Signed-off-by: Baochen Qiang <bqiang@codeaurora.org>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
---
 drivers/net/wireless/ath/ath11k/pci.c | 61 ++++++++++++++++++---------
 1 file changed, 42 insertions(+), 19 deletions(-)

Comments

Kalle Valo Sept. 14, 2021, 8:36 a.m. UTC | #1 
Jouni Malinen <jouni@codeaurora.org> wrote:

> ath11k_pci_write32/read32 tries to wake up MHI before doing actual
> write/read work, which means each time a u32 is written/read, MHI
> wake up is performed. This is not necessary in case where we do a
> large amount of write/read, cause only one time of wake up is needed.
> So split each one into two parts, the first part does MHI get/put
> and the second one does actual write/read work.
> 
> Also avoid the put operation if the previous get operation fails.
> 
> Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
> 
> Signed-off-by: Baochen Qiang <bqiang@codeaurora.org>
> Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

This causes new warnings:

drivers/net/wireless/ath/ath11k/pci.c:177:6: error: no previous prototype for 'ath11k_pci_do_write32' [-Werror=missing-prototypes]
drivers/net/wireless/ath/ath11k/pci.c:224:5: error: no previous prototype for 'ath11k_pci_do_read32' [-Werror=missing-prototypes]

I fixed them in the pending branch like this:

--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -174,7 +174,7 @@ static inline u32 ath11k_pci_get_window_start(struct ath11k_base *ab,
        return window_start;
 }
 
-void ath11k_pci_do_write32(struct ath11k_base *ab, u32 offset, u32 value)
+static void ath11k_pci_do_write32(struct ath11k_base *ab, u32 offset, u32 value)
 {
        struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
        u32 window_start;
@@ -221,7 +221,7 @@ void ath11k_pci_write32(struct ath11k_base *ab, u32 offset, u32 value)
                mhi_device_put(ab_pci->mhi_ctrl->mhi_dev);
 }
 
-u32 ath11k_pci_do_read32(struct ath11k_base *ab, u32 offset)
+static u32 ath11k_pci_do_read32(struct ath11k_base *ab, u32 offset)
 {
        struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
        u32 val, window_start;
diff mbox series

Patch

diff --git a/drivers/net/wireless/ath/ath11k/pci.c b/drivers/net/wireless/ath/ath11k/pci.c
index 1094b53465bc..5c3ec3e7be89 100644
--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -174,18 +174,11 @@  static inline u32 ath11k_pci_get_window_start(struct ath11k_base *ab,
 	return window_start;
 }
 
-void ath11k_pci_write32(struct ath11k_base *ab, u32 offset, u32 value)
+void ath11k_pci_do_write32(struct ath11k_base *ab, u32 offset, u32 value)
 {
 	struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
 	u32 window_start;
 
-	/* for offset beyond BAR + 4K - 32, may
-	 * need to wakeup MHI to access.
-	 */
-	if (test_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags) &&
-	    offset >= ACCESS_ALWAYS_OFF)
-		mhi_device_get_sync(ab_pci->mhi_ctrl->mhi_dev);
-
 	if (offset < WINDOW_START) {
 		iowrite32(value, ab->mem  + offset);
 	} else {
@@ -205,23 +198,33 @@  void ath11k_pci_write32(struct ath11k_base *ab, u32 offset, u32 value)
 				  (offset & WINDOW_RANGE_MASK));
 		}
 	}
-
-	if (test_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags) &&
-	    offset >= ACCESS_ALWAYS_OFF)
-		mhi_device_put(ab_pci->mhi_ctrl->mhi_dev);
 }
 
-u32 ath11k_pci_read32(struct ath11k_base *ab, u32 offset)
+void ath11k_pci_write32(struct ath11k_base *ab, u32 offset, u32 value)
 {
 	struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
-	u32 val, window_start;
+	bool wakeup_required;
+	int ret;
 
 	/* for offset beyond BAR + 4K - 32, may
 	 * need to wakeup MHI to access.
 	 */
-	if (test_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags) &&
-	    offset >= ACCESS_ALWAYS_OFF)
-		mhi_device_get_sync(ab_pci->mhi_ctrl->mhi_dev);
+	wakeup_required = test_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags) &&
+			  offset >= ACCESS_ALWAYS_OFF;
+
+	if (wakeup_required)
+		ret = mhi_device_get_sync(ab_pci->mhi_ctrl->mhi_dev);
+
+	ath11k_pci_do_write32(ab, offset, value);
+
+	if (wakeup_required && !ret)
+		mhi_device_put(ab_pci->mhi_ctrl->mhi_dev);
+}
+
+u32 ath11k_pci_do_read32(struct ath11k_base *ab, u32 offset)
+{
+	struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
+	u32 val, window_start;
 
 	if (offset < WINDOW_START) {
 		val = ioread32(ab->mem + offset);
@@ -243,8 +246,28 @@  u32 ath11k_pci_read32(struct ath11k_base *ab, u32 offset)
 		}
 	}
 
-	if (test_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags) &&
-	    offset >= ACCESS_ALWAYS_OFF)
+	return val;
+}
+
+u32 ath11k_pci_read32(struct ath11k_base *ab, u32 offset)
+{
+	struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
+	u32 val;
+	bool wakeup_required;
+	int ret;
+
+	/* for offset beyond BAR + 4K - 32, may
+	 * need to wakeup MHI to access.
+	 */
+	wakeup_required = test_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags) &&
+			  offset >= ACCESS_ALWAYS_OFF;
+
+	if (wakeup_required)
+		ret = mhi_device_get_sync(ab_pci->mhi_ctrl->mhi_dev);
+
+	val = ath11k_pci_do_read32(ab, offset);
+
+	if (wakeup_required && !ret)
 		mhi_device_put(ab_pci->mhi_ctrl->mhi_dev);
 
 	return val;