drm/xe: Implement a local xe_mmio_wait32

Then, move the i915_utils.h include to its user.

The overall goal is to kill all the usages of the i915_utils
stuff.

Yes, wait_for also depends on <linux/delay.h>, so they go
together to where it is needed. It will be likely needed
anyway directly for udelay or usleep_range.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>

drivers/gpu/drm/xe/xe_force_wake.c

@@ -10,6 +10,12 @@
 #include "xe_mmio.h"
 #include "gt/intel_gt_regs.h"
 
+/*
+ * FIXME: This header has been deemed evil and we need to kill it. Temporarily
+ * including so we can use '__mask_next_bit'.
+ */
+#include "i915_utils.h"
+
 #define XE_FORCE_WAKE_ACK_TIMEOUT_MS	50
 
 static struct xe_gt *

drivers/gpu/drm/xe/xe_gt_mcr.c

@@ -11,6 +11,13 @@
 
 #include "gt/intel_gt_regs.h"
 
+#include <linux/delay.h>
+/*
+ * FIXME: This header has been deemed evil and we need to kill it. Temporar
+ * including so we can use 'wait_for'.
+ */
+#include "i915_utils.h"
+
 /**
  * DOC: GT Multicast/Replicated (MCR) Register Support
  *

drivers/gpu/drm/xe/xe_guc.c

@@ -22,6 +22,13 @@
 #include "i915_reg_defs.h"
 #include "gt/intel_gt_regs.h"
 
+#include <linux/delay.h>
+/*
+ * FIXME: This header has been deemed evil and we need to kill it. Temporarily
+ * including so we can use 'wait_for' and range_overflow_t.
+ */
+#include "i915_utils.h"
+
 /* TODO: move to common file */
 #define GUC_PVC_MOCS_INDEX_MASK		REG_GENMASK(25, 24)
 #define PVC_MOCS_UC_INDEX		1

drivers/gpu/drm/xe/xe_guc_pc.c

@@ -16,6 +16,13 @@
 #include "i915_reg_defs.h"
 #include "i915_reg.h"
 
+#include <linux/delay.h>
+/*
+ * FIXME: This header has been deemed evil and we need to kill it. Temporarily
+ * including so we can use 'wait_for'.
+ */
+#include "i915_utils.h"
+
 #include "intel_mchbar_regs.h"
 
 /* For GEN6_RP_STATE_CAP.reg to be merged when the definition moves to Xe */

drivers/gpu/drm/xe/xe_mmio.h

@@ -10,13 +10,6 @@
 
 #include "xe_gt_types.h"
 
-/*
- * FIXME: This header has been deemed evil and we need to kill it. Temporarily
- * including so we can use 'wait_for' and unblock initial development. A follow
- * should replace 'wait_for' with a sane version and drop including this header.
- */
-#include "i915_utils.h"
-
 struct drm_device;
 struct drm_file;
 struct xe_device;
@@ -93,8 +86,26 @@ static inline int xe_mmio_wait32(struct xe_gt *gt,
 				 u32 reg, u32 val,
 				 u32 mask, u32 timeout_ms)
 {
-	return wait_for((xe_mmio_read32(gt, reg) & mask) == val,
-			timeout_ms);
+	ktime_t cur = ktime_get_raw();
+	const ktime_t end = ktime_add_ms(cur, timeout_ms);
+	s64 wait = 10;
+
+	for (;;) {
+		if ((xe_mmio_read32(gt, reg) & mask) == val)
+			return 0;
+
+		cur = ktime_get_raw();
+		if (!ktime_before(cur, end))
+			return -ETIMEDOUT;
+
+		if (ktime_after(ktime_add_us(cur, wait), end))
+			wait = ktime_us_delta(end, cur);
+
+		usleep_range(wait, wait << 1);
+		wait <<= 1;
+	}
+
+	return -ETIMEDOUT;
 }
 
 int xe_mmio_ioctl(struct drm_device *dev, void *data,

drivers/gpu/drm/xe/xe_pcode.c

@@ -11,6 +11,13 @@
 
 #include <linux/errno.h>
 
+#include <linux/delay.h>
+/*
+ * FIXME: This header has been deemed evil and we need to kill it. Temporarily
+ * including so we can use 'wait_for'.
+ */
+#include "i915_utils.h"
+
 /**
  * DOC: PCODE
  *