[PATCH] drm/i915: Support RGB16161616_64B compressed formats

[Melanie Lobo <melanie.lobo@intel.com>]

Add support for a RGB64(FP16) format where each color component is a
16-bit floating point value. FP16 format which is a binary
floating-point computer number format that occupies 16 bits in computer
memory. Platform shall render compression in display engine to receive
FP16 compressed formats.

This kernel change was tested with IGT patch,
https://patchwork.freedesktop.org/series/134353/
https://lore.kernel.org/all/20240603081607.30930-1-melanie.lobo@intel.com/

Test-with: 20240603081607.30930-1-melanie.lobo@intel.com

Credits: Juha-Pekka <juha-pekka.heikkila@intel.com>
Cc: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Cc: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
Cc: Swati Sharma <swati2.sharma@intel.com>
Signed-off-by: Melanie Lobo <melanie.lobo@intel.com>
---
 drivers/gpu/drm/i915/display/intel_fb.c            | 5 +++++
 drivers/gpu/drm/i915/display/skl_universal_plane.c | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fb.c b/drivers/gpu/drm/i915/display/intel_fb.c
index b6638726949d..91f2def14243 100644
--- a/drivers/gpu/drm/i915/display/intel_fb.c
+++ b/drivers/gpu/drm/i915/display/intel_fb.c
@@ -91,6 +91,11 @@ static const struct drm_format_info gen12_ccs_formats[] = {
 	{ .format = DRM_FORMAT_P016, .num_planes = 4,
 	  .char_per_block = { 2, 4, 1, 1 }, .block_w = { 1, 1, 2, 2 }, .block_h = { 1, 1, 1, 1 },
 	  .hsub = 2, .vsub = 2, .is_yuv = true },
+	{ .format = DRM_FORMAT_XRGB16161616F, .depth = 64, .num_planes = 2,
+	  .char_per_block = { 8, 1}, .block_w = { 1, 4}, .block_h = { 1, 2}, .hsub = 1, .vsub = 1},
+	{ .format = DRM_FORMAT_ARGB16161616F, .depth = 64, .num_planes = 2,
+	  .char_per_block = { 8, 1}, .block_w = { 1, 4}, .block_h = { 1, 2},
+	  .hsub = 1, .vsub = 1, .has_alpha = true},
 };
 
 /*
diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 1aa70fc35b9d..7719cb04bdf8 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -2242,6 +2242,8 @@ static bool gen12_plane_format_mod_supported(struct drm_plane *_plane,
 	case DRM_FORMAT_XBGR8888:
 	case DRM_FORMAT_ARGB8888:
 	case DRM_FORMAT_ABGR8888:
+	case DRM_FORMAT_XRGB16161616F:
+	case DRM_FORMAT_ARGB16161616F:
 		if (intel_fb_is_ccs_modifier(modifier))
 			return true;
 		fallthrough;
@@ -2266,8 +2268,6 @@ static bool gen12_plane_format_mod_supported(struct drm_plane *_plane,
 	case DRM_FORMAT_C8:
 	case DRM_FORMAT_XBGR16161616F:
 	case DRM_FORMAT_ABGR16161616F:
-	case DRM_FORMAT_XRGB16161616F:
-	case DRM_FORMAT_ARGB16161616F:
 	case DRM_FORMAT_Y210:
 	case DRM_FORMAT_Y212:
 	case DRM_FORMAT_Y216:
-- 
2.17.1