drm/i915/gmbus: add wrapper for gmbus mmio base

Don't repeat the same thing so much.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/db360d824d47601d5ca843afa6f5d6ee17d0e514.1661855191.git.jani.nikula@intel.com

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

@@ -8,8 +8,9 @@
 
 #include "i915_reg_defs.h"
 
-#define GPIO(gpio)		_MMIO(dev_priv->display.gmbus.mmio_base + 0x5010 + \
-				      4 * (gpio))
+#define GMBUS_MMIO_BASE(__i915) ((__i915)->display.gmbus.mmio_base)
+
+#define GPIO(gpio)		_MMIO(GMBUS_MMIO_BASE(dev_priv) + 0x5010 + 4 * (gpio))
 #define   GPIO_CLOCK_DIR_MASK		(1 << 0)
 #define   GPIO_CLOCK_DIR_IN		(0 << 1)
 #define   GPIO_CLOCK_DIR_OUT		(1 << 1)
@@ -26,7 +27,7 @@
 #define   GPIO_DATA_PULLUP_DISABLE	(1 << 13)
 
 /* clock/port select */
-#define GMBUS0			_MMIO(dev_priv->display.gmbus.mmio_base + 0x5100)
+#define GMBUS0			_MMIO(GMBUS_MMIO_BASE(dev_priv) + 0x5100)
 #define   GMBUS_AKSV_SELECT		(1 << 11)
 #define   GMBUS_RATE_100KHZ		(0 << 8)
 #define   GMBUS_RATE_50KHZ		(1 << 8)
@@ -36,7 +37,7 @@
 #define   GMBUS_BYTE_CNT_OVERRIDE	(1 << 6)
 
 /* command/status */
-#define GMBUS1			_MMIO(dev_priv->display.gmbus.mmio_base + 0x5104)
+#define GMBUS1			_MMIO(GMBUS_MMIO_BASE(dev_priv) + 0x5104)
 #define   GMBUS_SW_CLR_INT		(1 << 31)
 #define   GMBUS_SW_RDY			(1 << 30)
 #define   GMBUS_ENT			(1 << 29) /* enable timeout */
@@ -53,7 +54,7 @@
 #define   GMBUS_SLAVE_WRITE		(0 << 0)
 
 /* status */
-#define GMBUS2			_MMIO(dev_priv->display.gmbus.mmio_base + 0x5108)
+#define GMBUS2			_MMIO(GMBUS_MMIO_BASE(dev_priv) + 0x5108)
 #define   GMBUS_INUSE			(1 << 15)
 #define   GMBUS_HW_WAIT_PHASE		(1 << 14)
 #define   GMBUS_STALL_TIMEOUT		(1 << 13)
@@ -63,10 +64,10 @@
 #define   GMBUS_ACTIVE			(1 << 9)
 
 /* data buffer bytes 3-0 */
-#define GMBUS3			_MMIO(dev_priv->display.gmbus.mmio_base + 0x510c)
+#define GMBUS3			_MMIO(GMBUS_MMIO_BASE(dev_priv) + 0x510c)
 
 /* interrupt mask (Pineview+) */
-#define GMBUS4			_MMIO(dev_priv->display.gmbus.mmio_base + 0x5110)
+#define GMBUS4			_MMIO(GMBUS_MMIO_BASE(dev_priv) + 0x5110)
 #define   GMBUS_SLAVE_TIMEOUT_EN	(1 << 4)
 #define   GMBUS_NAK_EN			(1 << 3)
 #define   GMBUS_IDLE_EN			(1 << 2)
@@ -74,7 +75,7 @@
 #define   GMBUS_HW_RDY_EN		(1 << 0)
 
 /* byte index */
-#define GMBUS5			_MMIO(dev_priv->display.gmbus.mmio_base + 0x5120)
+#define GMBUS5			_MMIO(GMBUS_MMIO_BASE(dev_priv) + 0x5120)
 #define   GMBUS_2BYTE_INDEX_EN		(1 << 31)
 
 #endif /* __INTEL_GMBUS_REGS_H__ */