drm/i915: Convert INTEL_INFO()->display to a pointer

Rather than embeddeding the display's device info within the main device
info structure, just provide a pointer to the display-specific
structure. This is in preparation for moving the display device info
definitions into the display code itself and for eventually allowing the
pointer to be assigned at runtime on platforms that use GMD_ID for
device identification.

In the future, this will also eventually allow the same display device
info structures to be used outside the current i915 code (e.g., from the
Xe driver).

v2:
- Move introduction of DISPLAY_INFO() to this patch. (Andrzej)
v3:
- Also use DISPLAY_INFO() in intel_display_reg_defs.h. (Andrzej)
- Use "{}" instead of "{ 0 }" for empty struct init. (Jani)

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Acked-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230523195609.73627-3-matthew.d.roper@intel.com

drm/i915: Convert PIPE3/PORT3 to _PICK_EVEN_2RANGES()

Like done for when __var_args__ were used, but size-wise it's also
benefitial to avoid _PICK() used for 3 ports/pipes:

$ size build64/drivers/gpu/drm/i915/i915.o{.old,.new}
text data bss dec hex filename
4026288 185703 6984 4218975 40605f build64/drivers/gpu/drm/i915/i915.o.old
4025496 185703 6984 4218183 405d47 build64/drivers/gpu/drm/i915/i915.o.new

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230120193457.3295977-6-lucas.demarchi@intel.com

drm/i915: Replace _MMIO_PHY3() with _PICK_EVEN_2RANGES()

As done previously for pll, also convert users of _PHY3() to
_PICK_EVEN_2RANGES(). Size comparison of i915.o:

$ size build64/drivers/gpu/drm/i915/i915.o{.old,.new}
text data bss dec hex filename
4026997 185703 6984 4219684 406324 build64/drivers/gpu/drm/i915/i915.o.old
4026288 185703 6984 4218975 40605f build64/drivers/gpu/drm/i915/i915.o.new

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230120193457.3295977-5-lucas.demarchi@intel.com

drm/i915: Convert pll macros to _PICK_EVEN_2RANGES

Avoid the array lookup, converting the PLL macros after ICL to
_PICK_EVEN_RANGES. This provides the following reduction in code size:

$ size build64/drivers/gpu/drm/i915/i915.o{.old,.new}
text data bss dec hex filename
4027456 185703 6984 4220143 4064ef build64/drivers/gpu/drm/i915/i915.o.old
4026997 185703 6984 4219684 406324 build64/drivers/gpu/drm/i915/i915.o.new

At the same time it's safer, avoiding out-of-bounds array access. This
allows to remove _MMIO_PLL3() that is now unused.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230120193457.3295977-4-lucas.demarchi@intel.com

drm/i915: split out intel_display_reg_defs.h

Split out the display register helper macros to a separate file. For
now, include it from i915_reg.h, but note that there are already files
that don't need i915_reg.h, such as intel_audio.c.

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/3af47193ff5219b6d2cfe353b752ec4bb44de4f1.1668008071.git.jani.nikula@intel.com