drm/i915: add display engine uncore helpers

Add convenience helpers for the most common uncore operations with
struct drm_i915_private * as context rather than struct intel_uncore *.

The goal is to replace all instances of I915_READ(),
I915_POSTING_READ(), I915_WRITE(), I915_READ_FW(), and I915_WRITE_FW()
in display/ with these, to finally be able to get rid of the implicit
dev_priv local parameter use.

The idea is that any non-u32 reads or writes are special enough that
they can use the intel_uncore_* functions directly.

v2:
- rename the file intel_de.h
- move intel_de_wait_for_* there too
- also add de fw helpers

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200121113915.9813-1-jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_de.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#ifndef __INTEL_DE_H__
+#define __INTEL_DE_H__
+
+#include "i915_drv.h"
+#include "i915_reg.h"
+#include "intel_uncore.h"
+
+static inline u32
+intel_de_read(struct drm_i915_private *i915, i915_reg_t reg)
+{
+	return intel_uncore_read(&i915->uncore, reg);
+}
+
+static inline void
+intel_de_posting_read(struct drm_i915_private *i915, i915_reg_t reg)
+{
+	intel_uncore_posting_read(&i915->uncore, reg);
+}
+
+/* Note: read the warnings for intel_uncore_*_fw() functions! */
+static inline u32
+intel_de_read_fw(struct drm_i915_private *i915, i915_reg_t reg)
+{
+	return intel_uncore_read_fw(&i915->uncore, reg);
+}
+
+static inline void
+intel_de_write(struct drm_i915_private *i915, i915_reg_t reg, u32 val)
+{
+	intel_uncore_write(&i915->uncore, reg, val);
+}
+
+/* Note: read the warnings for intel_uncore_*_fw() functions! */
+static inline void
+intel_de_write_fw(struct drm_i915_private *i915, i915_reg_t reg, u32 val)
+{
+	intel_uncore_write_fw(&i915->uncore, reg, val);
+}
+
+static inline void
+intel_de_rmw(struct drm_i915_private *i915, i915_reg_t reg, u32 clear, u32 set)
+{
+	intel_uncore_rmw(&i915->uncore, reg, clear, set);
+}
+
+static inline int
+intel_de_wait_for_register(struct drm_i915_private *i915, i915_reg_t reg,
+			   u32 mask, u32 value, unsigned int timeout)
+{
+	return intel_wait_for_register(&i915->uncore, reg, mask, value, timeout);
+}
+
+static inline int
+intel_de_wait_for_set(struct drm_i915_private *i915, i915_reg_t reg,
+		      u32 mask, unsigned int timeout)
+{
+	return intel_de_wait_for_register(i915, reg, mask, mask, timeout);
+}
+
+static inline int
+intel_de_wait_for_clear(struct drm_i915_private *i915, i915_reg_t reg,
+			u32 mask, unsigned int timeout)
+{
+	return intel_de_wait_for_register(i915, reg, mask, 0, timeout);
+}
+
+#endif /* __INTEL_DE_H__ */

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -44,6 +44,7 @@
 #include <media/cec-notifier.h>
 
 #include "i915_drv.h"
+#include "intel_de.h"
 
 struct drm_printer;
 

drivers/gpu/drm/i915/i915_drv.h

@@ -2008,20 +2008,6 @@ int i915_reg_read_ioctl(struct drm_device *dev, void *data,
 #define I915_READ_FW(reg__) __I915_REG_OP(read_fw, dev_priv, (reg__))
 #define I915_WRITE_FW(reg__, val__) __I915_REG_OP(write_fw, dev_priv, (reg__), (val__))
 
-/* register wait wrappers for display regs */
-#define intel_de_wait_for_register(dev_priv_, reg_, mask_, value_, timeout_) \
-	intel_wait_for_register(&(dev_priv_)->uncore, \
-				(reg_), (mask_), (value_), (timeout_))
-
-#define intel_de_wait_for_set(dev_priv_, reg_, mask_, timeout_) ({	\
-	u32 mask__ = (mask_);						\
-	intel_de_wait_for_register((dev_priv_), (reg_),			\
-				   mask__, mask__, (timeout_)); \
-})
-
-#define intel_de_wait_for_clear(dev_priv_, reg_, mask_, timeout_) \
-	intel_de_wait_for_register((dev_priv_), (reg_), (mask_), 0, (timeout_))
-
 /* i915_mm.c */
 int remap_io_mapping(struct vm_area_struct *vma,
 		     unsigned long addr, unsigned long pfn, unsigned long size,