diff mbox series

[09/19] xhci: Clean up ERST_PTR_MASK inversion

Message ID 20231019102924.2797346-10-mathias.nyman@linux.intel.com
State New
Headers show
Series xhci features for usb-next | expand

Commit Message

Mathias Nyman Oct. 19, 2023, 10:29 a.m. UTC 
From: Lukas Wunner <lukas@wunner.de>

Mathias notes that the ERST_PTR_MASK macro is named as if it's masking
the Event Ring Dequeue Pointer in the ERDP register, but in actuality
it's masking the inverse.

Invert the macro's value for clarity.

Migrate it to the modern GENMASK_ULL() syntax to avoid u64 casts.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
 drivers/usb/host/xhci-mem.c  | 3 +--
 drivers/usb/host/xhci-ring.c | 5 ++---
 drivers/usb/host/xhci.c      | 2 +-
 drivers/usb/host/xhci.h      | 2 +-
 4 files changed, 5 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index d4123e6f2549..b133817ad180 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1952,8 +1952,7 @@  static void xhci_set_hc_event_deq(struct xhci_hcd *xhci, struct xhci_interrupter
 	 */
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
 		       "// Write event ring dequeue pointer, preserving EHB bit");
-	xhci_write_64(xhci, ((u64) deq & (u64) ~ERST_PTR_MASK),
-			&ir->ir_set->erst_dequeue);
+	xhci_write_64(xhci, deq & ERST_PTR_MASK, &ir->ir_set->erst_dequeue);
 }
 
 static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 173c2068eb64..17404b14d1bf 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -3013,13 +3013,12 @@  static void xhci_update_erst_dequeue(struct xhci_hcd *xhci,
 		 * Per 4.9.4, Software writes to the ERDP register shall
 		 * always advance the Event Ring Dequeue Pointer value.
 		 */
-		if ((temp_64 & (u64) ~ERST_PTR_MASK) ==
-				((u64) deq & (u64) ~ERST_PTR_MASK))
+		if ((temp_64 & ERST_PTR_MASK) == (deq & ERST_PTR_MASK))
 			return;
 
 		/* Update HC event ring dequeue pointer */
 		temp_64 = ir->event_ring->deq_seg->num & ERST_DESI_MASK;
-		temp_64 |= ((u64) deq & (u64) ~ERST_PTR_MASK);
+		temp_64 |= deq & ERST_PTR_MASK;
 	}
 
 	/* Clear the event handler busy flag (RW1C) */
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index e1b1b64a0723..68920cb96044 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -520,7 +520,7 @@  int xhci_run(struct usb_hcd *hcd)
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "xhci_run");
 
 	temp_64 = xhci_read_64(xhci, &ir->ir_set->erst_dequeue);
-	temp_64 &= ~ERST_PTR_MASK;
+	temp_64 &= ERST_PTR_MASK;
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
 			"ERST deq = 64'h%0lx", (long unsigned int) temp_64);
 
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 41820fd97c00..f97896740c3f 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -525,7 +525,7 @@  struct xhci_intr_reg {
  * a work queue (or delayed service routine)?
  */
 #define ERST_EHB		(1 << 3)
-#define ERST_PTR_MASK		(0xf)
+#define ERST_PTR_MASK		(GENMASK_ULL(63, 4))
 
 /**
  * struct xhci_run_regs