wil6210: prevent deep sleep of 60G device in critical paths

In idle times 60G device can enter deep sleep and turn off
its XTAL clock.
Host access triggers the device power-up flow which will hold
the AHB during XTAL stabilization until device switches from
slow-clock to XTAL clock.
This behavior can stall the PCIe bus for some arbitrary period
of time.
In order to prevent this stall, host can vote for High Latency
Access Policy (HALP) before reading from PCIe bus.
This vote will wakeup the device from deep sleep and prevent
deep sleep until unvote is done.

Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 28 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h b/drivers/net/wireless/ath/wil6210/wil6210.h
index 50acd136d967..74bc2c5c1a44 100644
--- a/drivers/net/wireless/ath/wil6210/wil6210.h
+++ b/drivers/net/wireless/ath/wil6210/wil6210.h
@@ -168,6 +168,7 @@ struct RGF_ICR {
 #define RGF_DMA_EP_MISC_ICR		(0x881bec) /* struct RGF_ICR */
 	#define BIT_DMA_EP_MISC_ICR_RX_HTRSH	BIT(0)
 	#define BIT_DMA_EP_MISC_ICR_TX_NO_ACT	BIT(1)
+	#define BIT_DMA_EP_MISC_ICR_HALP	BIT(27)
 	#define BIT_DMA_EP_MISC_ICR_FW_INT(n)	BIT(28+n) /* n = [0..3] */
 
 /* Legacy interrupt moderation control (before Sparrow v2)*/
@@ -534,6 +535,17 @@ struct pmc_ctx {
 	int			descriptor_size;
 };
 
+struct wil_halp {
+	struct mutex		lock; /* protect halp ref_cnt */
+	unsigned int		ref_cnt;
+	struct completion	comp;
+};
+
+struct wil_blob_wrapper {
+	struct wil6210_priv *wil;
+	struct debugfs_blob_wrapper blob;
+};
+
 struct wil6210_priv {
 	struct pci_dev *pdev;
 	struct wireless_dev *wdev;
@@ -606,7 +618,7 @@ struct wil6210_priv {
 	atomic_t isr_count_rx, isr_count_tx;
 	/* debugfs */
 	struct dentry *debug;
-	struct debugfs_blob_wrapper blobs[ARRAY_SIZE(fw_mapping)];
+	struct wil_blob_wrapper blobs[ARRAY_SIZE(fw_mapping)];
 	u8 discovery_mode;
 
 	void *platform_handle;
@@ -622,6 +634,10 @@ struct wil6210_priv {
 	struct wireless_dev *p2p_wdev;
 	struct mutex p2p_wdev_mutex; /* protect @p2p_wdev */
 	struct wireless_dev *radio_wdev;
+
+	/* High Access Latency Policy voting */
+	struct wil_halp halp;
+
 };
 
 #define wil_to_wiphy(i) (i->wdev->wiphy)
@@ -713,6 +729,12 @@ void wil_memcpy_fromio_32(void *dst, const volatile void __iomem *src,
 			  size_t count);
 void wil_memcpy_toio_32(volatile void __iomem *dst, const void *src,
 			size_t count);
+void wil_memcpy_fromio_halp_vote(struct wil6210_priv *wil, void *dst,
+				 const volatile void __iomem *src,
+				 size_t count);
+void wil_memcpy_toio_halp_vote(struct wil6210_priv *wil,
+			       volatile void __iomem *dst,
+			       const void *src, size_t count);
 
 void *wil_if_alloc(struct device *dev);
 void wil_if_free(struct wil6210_priv *wil);
@@ -849,4 +871,9 @@ int wil_resume(struct wil6210_priv *wil, bool is_runtime);
 int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size);
 void wil_fw_core_dump(struct wil6210_priv *wil);
 
+void wil_halp_vote(struct wil6210_priv *wil);
+void wil_halp_unvote(struct wil6210_priv *wil);
+void wil6210_set_halp(struct wil6210_priv *wil);
+void wil6210_clear_halp(struct wil6210_priv *wil);
+
 #endif /* __WIL6210_H__ */