[PATCH 01/18] drm: Introduce new HDMI helpers

[Maxime Ripard <maxime@cerno.tech>]

The new bridge rework to support the input and output formats introduced
some boilerplate code that will need to be shared across drivers.

Since dw-hdmi is the only driver so far, let's introduce those helpers
based on that code.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/Makefile   |   2 +-
 drivers/gpu/drm/drm_hdmi.c | 170 +++++++++++++++++++++++++++++++++++++
 include/drm/drm_hdmi.h     |  24 ++++++
 3 files changed, 195 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/drm_hdmi.c
 create mode 100644 include/drm/drm_hdmi.h

diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 5eb5bf7c16e3..1b77bd64a37e 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -17,7 +17,7 @@ drm-y       :=	drm_auth.o drm_cache.o \
 		drm_plane.o drm_color_mgmt.o drm_print.o \
 		drm_dumb_buffers.o drm_mode_config.o drm_vblank.o \
 		drm_syncobj.o drm_lease.o drm_writeback.o drm_client.o \
-		drm_client_modeset.o drm_atomic_uapi.o drm_hdcp.o \
+		drm_client_modeset.o drm_atomic_uapi.o drm_hdmi.o drm_hdcp.o \
 		drm_managed.o drm_vblank_work.o
 
 drm-$(CONFIG_DRM_LEGACY) += drm_bufs.o drm_context.o drm_dma.o drm_legacy_misc.o drm_lock.o \
diff --git a/drivers/gpu/drm/drm_hdmi.c b/drivers/gpu/drm/drm_hdmi.c
new file mode 100644
index 000000000000..3834d5dd6d88
--- /dev/null
+++ b/drivers/gpu/drm/drm_hdmi.c
@@ -0,0 +1,170 @@
+#include <linux/errno.h>
+#include <linux/hdmi.h>
+#include <linux/media-bus-format.h>
+#include <linux/types.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_hdmi.h>
+
+/**
+ * drm_hdmi_bus_fmt_is_rgb() - Is the media bus format an RGB format?
+ * @bus_format: MEDIA_BUS_FMT* to test
+ *
+ * Checks if the media bus format is an RGB one
+ *
+ * RETURNS:
+ * True if the format is an RGB one, false otherwise
+ */
+bool drm_hdmi_bus_fmt_is_rgb(u32 bus_format)
+{
+	switch (bus_format) {
+	case MEDIA_BUS_FMT_RGB888_1X24:
+	case MEDIA_BUS_FMT_RGB101010_1X30:
+	case MEDIA_BUS_FMT_RGB121212_1X36:
+	case MEDIA_BUS_FMT_RGB161616_1X48:
+		return true;
+
+	default:
+		return false;
+	}
+}
+EXPORT_SYMBOL(drm_hdmi_bus_fmt_is_rgb);
+
+/**
+ * drm_hdmi_bus_fmt_is_yuv444() - Is the media bus format an YUV444 format?
+ * @bus_format: MEDIA_BUS_FMT* to test
+ *
+ * Checks if the media bus format is an YUV444 one
+ *
+ * RETURNS:
+ * True if the format is an YUV444 one, false otherwise
+ */
+bool drm_hdmi_bus_fmt_is_yuv444(u32 bus_format)
+{
+	switch (bus_format) {
+	case MEDIA_BUS_FMT_YUV8_1X24:
+	case MEDIA_BUS_FMT_YUV10_1X30:
+	case MEDIA_BUS_FMT_YUV12_1X36:
+	case MEDIA_BUS_FMT_YUV16_1X48:
+		return true;
+
+	default:
+		return false;
+	}
+}
+EXPORT_SYMBOL(drm_hdmi_bus_fmt_is_yuv444);
+
+/**
+ * drm_hdmi_bus_fmt_is_yuv422() - Is the media bus format an YUV422 format?
+ * @bus_format: MEDIA_BUS_FMT* to test
+ *
+ * Checks if the media bus format is an YUV422 one
+ *
+ * RETURNS:
+ * True if the format is an YUV422 one, false otherwise
+ */
+bool drm_hdmi_bus_fmt_is_yuv422(u32 bus_format)
+{
+	switch (bus_format) {
+	case MEDIA_BUS_FMT_UYVY8_1X16:
+	case MEDIA_BUS_FMT_UYVY10_1X20:
+	case MEDIA_BUS_FMT_UYVY12_1X24:
+		return true;
+
+	default:
+		return false;
+	}
+}
+EXPORT_SYMBOL(drm_hdmi_bus_fmt_is_yuv422);
+
+/**
+ * drm_hdmi_bus_fmt_is_yuv420() - Is the media bus format an YUV420 format?
+ * @bus_format: MEDIA_BUS_FMT* to test
+ *
+ * Checks if the media bus format is an YUV420 one
+ *
+ * RETURNS:
+ * True if the format is an YUV420 one, false otherwise
+ */
+bool drm_hdmi_bus_fmt_is_yuv420(u32 bus_format)
+{
+	switch (bus_format) {
+	case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
+	case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
+	case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
+	case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
+		return true;
+
+	default:
+		return false;
+	}
+}
+EXPORT_SYMBOL(drm_hdmi_bus_fmt_is_yuv420);
+
+/**
+ * drm_hdmi_bus_fmt_color_depth() - Returns the color depth in bits
+ * @bus_format: MEDIA_BUS_FMT* to test
+ *
+ * Computes the number of bits per color for a given media bus format
+ *
+ * RETURNS:
+ * The number of bits per color
+ */
+int drm_hdmi_bus_fmt_color_depth(u32 bus_format)
+{
+	switch (bus_format) {
+	case MEDIA_BUS_FMT_RGB888_1X24:
+	case MEDIA_BUS_FMT_YUV8_1X24:
+	case MEDIA_BUS_FMT_UYVY8_1X16:
+	case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
+		return 8;
+
+	case MEDIA_BUS_FMT_RGB101010_1X30:
+	case MEDIA_BUS_FMT_YUV10_1X30:
+	case MEDIA_BUS_FMT_UYVY10_1X20:
+	case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
+		return 10;
+
+	case MEDIA_BUS_FMT_RGB121212_1X36:
+	case MEDIA_BUS_FMT_YUV12_1X36:
+	case MEDIA_BUS_FMT_UYVY12_1X24:
+	case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
+		return 12;
+
+	case MEDIA_BUS_FMT_RGB161616_1X48:
+	case MEDIA_BUS_FMT_YUV16_1X48:
+	case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
+		return 16;
+
+	default:
+		return 0;
+	}
+}
+EXPORT_SYMBOL(drm_hdmi_bus_fmt_color_depth);
+
+/**
+ * drm_hdmi_bus_fmt_color_depth() - Returns the color depth in bits
+ * @bus_format: MEDIA_BUS_FMT* to test
+ *
+ * Computes the number of bits per color for a given media bus format
+ *
+ * RETURNS:
+ * The number of bits per color
+ */
+int drm_hdmi_avi_infoframe_output_colorspace(struct hdmi_avi_infoframe *frame,
+					     struct drm_bus_cfg *out_bus_cfg)
+{
+	if (drm_hdmi_bus_fmt_is_yuv444(out_bus_cfg->format))
+		frame->colorspace = HDMI_COLORSPACE_YUV444;
+	else if (drm_hdmi_bus_fmt_is_yuv422(out_bus_cfg->format))
+		frame->colorspace = HDMI_COLORSPACE_YUV422;
+	else if (drm_hdmi_bus_fmt_is_yuv420(out_bus_cfg->format))
+		frame->colorspace = HDMI_COLORSPACE_YUV420;
+	else if (drm_hdmi_bus_fmt_is_rgb(out_bus_cfg->format))
+		frame->colorspace = HDMI_COLORSPACE_RGB;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_hdmi_avi_infoframe_output_colorspace);
diff --git a/include/drm/drm_hdmi.h b/include/drm/drm_hdmi.h
new file mode 100644
index 000000000000..8cd281699ea0
--- /dev/null
+++ b/include/drm/drm_hdmi.h
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2013-2015 Mentor Graphics Inc.
+ * Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
+ * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ */
+
+#ifndef __DRM_HDMI_H_
+#define __DRM_HDMI_H_
+
+#include <linux/types.h>
+
+struct drm_bus_cfg;
+struct hdmi_avi_infoframe;
+
+bool drm_hdmi_bus_fmt_is_rgb(u32 bus_format);
+bool drm_hdmi_bus_fmt_is_yuv444(u32 bus_format);
+bool drm_hdmi_bus_fmt_is_yuv422(u32 bus_format);
+bool drm_hdmi_bus_fmt_is_yuv420(u32 bus_format);
+int drm_hdmi_bus_fmt_color_depth(u32 bus_format);
+int drm_hdmi_avi_infoframe_output_colorspace(struct hdmi_avi_infoframe *frame,
+					     struct drm_bus_cfg *out_bus_cfg);
+
+#endif // __DRM_HDMI_H_
-- 
2.30.2

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