[PATCH v7 4/9] ath11k: Add register access logic for WCN6750

[Maxime Bizon]

On Thu, 2022-05-26 at 09:12 +0530, Manikanta Pubbisetty wrote:

> 
> Thanks for letting me know about this, IIRC I don't remember 
> encountering this problem in my testing. Just for my understanding,
> have you reverted this change and confirmed that these errors go away
> ?

I first confirmed the register location was indeed incorrect, then I
fixed it like this:

--- a/drivers/net/wireless/ath/ath11k/pcic.c
+++ b/drivers/net/wireless/ath/ath11k/pcic.c
@@ -143,7 +143,7 @@ EXPORT_SYMBOL(ath11k_pcic_init_msi_config);
 static inline u32 ath11k_pcic_get_window_start(struct ath11k_base *ab,
 					       u32 offset)
 {
-	u32 window_start = 0;
+	u32 window_start = ATH11K_PCI_WINDOW_START;
 
 	if ((offset ^ HAL_SEQ_WCSS_UMAC_OFFSET) < ATH11K_PCI_WINDOW_RANGE_MASK)
 		window_start = ab->hw_params.dp_window_idx * ATH11K_PCI_WINDOW_START;
@@ -170,8 +170,12 @@ void ath11k_pcic_write32(struct ath11k_base *ab, u32 offset, u32 value)
 		iowrite32(value, ab->mem  + offset);
 	} else if (ab->hw_params.static_window_map) {
 		window_start = ath11k_pcic_get_window_start(ab, offset);
-		iowrite32(value, ab->mem + window_start +
-			  (offset & ATH11K_PCI_WINDOW_RANGE_MASK));
+		if (window_start == ATH11K_PCI_WINDOW_START &&
+                    ab->pci.ops->window_write32)
+			ab->pci.ops->window_write32(ab, offset, value);
+		else
+			iowrite32(value, ab->mem + window_start +
+				  (offset & ATH11K_PCI_WINDOW_RANGE_MASK));
 	} else if (ab->pci.ops->window_write32) {
 		ab->pci.ops->window_write32(ab, offset, value);
 	}
@@ -200,8 +204,12 @@ u32 ath11k_pcic_read32(struct ath11k_base *ab, u32 offset)
 		val = ioread32(ab->mem + offset);
 	} else if (ab->hw_params.static_window_map) {
 		window_start = ath11k_pcic_get_window_start(ab, offset);
-		val = ioread32(ab->mem + window_start +
-			       (offset & ATH11K_PCI_WINDOW_RANGE_MASK));
+		if (window_start == ATH11K_PCI_WINDOW_START &&
+		    ab->pci.ops->window_read32)
+			val = ab->pci.ops->window_read32(ab, offset);
+		else
+			val = ioread32(ab->mem + window_start +
+				       (offset & ATH11K_PCI_WINDOW_RANGE_MASK));
 	} else if (ab->pci.ops->window_read32) {
 		val = ab->pci.ops->window_read32(ab, offset);
 	}

-- 
Maxime