[RFC 2/2] drm: Add HDMI helpers
Thierry Reding
thierry.reding at avionic-design.de
Wed Nov 21 07:01:53 PST 2012
Add a generic helper to fill in an HDMI AVI infoframe with data
extracted from a DRM display mode.
Signed-off-by: Thierry Reding <thierry.reding at avionic-design.de>
---
drivers/gpu/drm/Kconfig | 7 +++
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/drm_hdmi.c | 107 +++++++++++++++++++++++++++++++++++++++++++++
include/drm/drm_hdmi.h | 18 ++++++++
4 files changed, 133 insertions(+)
create mode 100644 drivers/gpu/drm/drm_hdmi.c
create mode 100644 include/drm/drm_hdmi.h
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 983201b..94a4623 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -69,6 +69,13 @@ config DRM_KMS_CMA_HELPER
help
Choose this if you need the KMS CMA helper functions
+config DRM_HDMI
+ bool
+ depends on DRM
+ select HDMI
+ help
+ Choose this if you need the HDMI helper functions
+
config DRM_TDFX
tristate "3dfx Banshee/Voodoo3+"
depends on DRM && PCI
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 0bfda06..330451b 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -16,6 +16,7 @@ drm-y := drm_auth.o drm_buffer.o drm_bufs.o drm_cache.o \
drm-$(CONFIG_COMPAT) += drm_ioc32.o
drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
+drm-$(CONFIG_DRM_HDMI) += drm_hdmi.o
drm-usb-y := drm_usb.o
diff --git a/drivers/gpu/drm/drm_hdmi.c b/drivers/gpu/drm/drm_hdmi.c
new file mode 100644
index 0000000..1a8d914
--- /dev/null
+++ b/drivers/gpu/drm/drm_hdmi.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2012 Avionic Design GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/hdmi.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_hdmi.h>
+
+struct hdmi_cea_mode {
+ unsigned char vic;
+ unsigned int width;
+ unsigned int height;
+ unsigned int refresh;
+ enum hdmi_picture_aspect aspect;
+ bool interlaced;
+ unsigned int repeat_min;
+ unsigned int repeat_max;
+};
+
+static const struct hdmi_cea_mode hdmi_cea_modes[] = {
+ { 1, 640, 480, 60, HDMI_PICTURE_ASPECT_4_3, false, 0, 0 },
+ { 2, 720, 480, 60, HDMI_PICTURE_ASPECT_NONE, false, 0, 0 },
+ { 4, 1280, 720, 60, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 5, 1920, 1080, 60, HDMI_PICTURE_ASPECT_16_9, true, 0, 0 },
+ { 6, 720, 480, 60, HDMI_PICTURE_ASPECT_NONE, true, 1, 1 },
+ { 8, 720, 240, 60, HDMI_PICTURE_ASPECT_NONE, false, 1, 1 },
+ { 10, 2880, 480, 60, HDMI_PICTURE_ASPECT_NONE, true, 0, 9 },
+ { 12, 2880, 240, 60, HDMI_PICTURE_ASPECT_NONE, false, 0, 9 },
+ { 14, 1440, 480, 60, HDMI_PICTURE_ASPECT_NONE, false, 0, 1 },
+ { 16, 1920, 1080, 60, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 17, 720, 576, 50, HDMI_PICTURE_ASPECT_NONE, false, 0, 0 },
+ { 19, 1280, 720, 50, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 20, 1920, 1080, 50, HDMI_PICTURE_ASPECT_16_9, true, 0, 0 },
+ { 21, 720, 576, 50, HDMI_PICTURE_ASPECT_NONE, true, 1, 1 },
+ { 23, 720, 288, 50, HDMI_PICTURE_ASPECT_NONE, false, 1, 1 },
+ { 25, 2880, 576, 50, HDMI_PICTURE_ASPECT_NONE, true, 0, 9 },
+ { 27, 2880, 288, 50, HDMI_PICTURE_ASPECT_NONE, false, 0, 9 },
+ { 29, 1440, 576, 50, HDMI_PICTURE_ASPECT_NONE, false, 0, 1 },
+ { 31, 1920, 1080, 50, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 32, 1920, 1080, 24, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 33, 1920, 1080, 25, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 34, 1920, 1080, 30, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 35, 2880, 480, 60, HDMI_PICTURE_ASPECT_NONE, false, 0, 3 },
+ { 37, 2880, 576, 50, HDMI_PICTURE_ASPECT_NONE, false, 0, 3 },
+ { 39, 1920, 1080, 50, HDMI_PICTURE_ASPECT_16_9, true, 0, 0 },
+ { 40, 1920, 1080, 100, HDMI_PICTURE_ASPECT_16_9, true, 0, 0 },
+ { 41, 1280, 720, 100, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 42, 720, 576, 100, HDMI_PICTURE_ASPECT_NONE, false, 0, 0 },
+ { 43, 720, 576, 100, HDMI_PICTURE_ASPECT_NONE, false, 0, 0 },
+ { 44, 720, 576, 100, HDMI_PICTURE_ASPECT_NONE, true, 1, 1 },
+ { 45, 720, 576, 100, HDMI_PICTURE_ASPECT_NONE, true, 1, 1 },
+ { 46, 1920, 1080, 120, HDMI_PICTURE_ASPECT_16_9, true, 0, 0 },
+ { 47, 1280, 720, 120, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 48, 720, 480, 120, HDMI_PICTURE_ASPECT_NONE, false, 0, 0 },
+ { 49, 720, 480, 120, HDMI_PICTURE_ASPECT_NONE, false, 0, 0 },
+ { 50, 720, 480, 120, HDMI_PICTURE_ASPECT_NONE, true, 1, 1 },
+ { 51, 720, 480, 120, HDMI_PICTURE_ASPECT_NONE, true, 1, 1 },
+ { 52, 720, 576, 200, HDMI_PICTURE_ASPECT_NONE, false, 0, 0 },
+ { 53, 720, 576, 200, HDMI_PICTURE_ASPECT_NONE, false, 0, 0 },
+ { 54, 720, 576, 200, HDMI_PICTURE_ASPECT_NONE, true, 1, 1 },
+ { 55, 720, 576, 200, HDMI_PICTURE_ASPECT_NONE, true, 1, 1 },
+ { 56, 720, 480, 240, HDMI_PICTURE_ASPECT_NONE, false, 0, 0 },
+ { 57, 720, 480, 240, HDMI_PICTURE_ASPECT_NONE, false, 0, 0 },
+ { 58, 720, 480, 240, HDMI_PICTURE_ASPECT_NONE, true, 1, 1 },
+ { 59, 720, 480, 240, HDMI_PICTURE_ASPECT_NONE, true, 1, 1 },
+ { 60, 1280, 720, 24, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 61, 1280, 720, 25, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 62, 1280, 720, 30, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 63, 1920, 1080, 120, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+ { 64, 1920, 1080, 100, HDMI_PICTURE_ASPECT_16_9, false, 0, 0 },
+};
+
+int drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
+ struct drm_display_mode *mode)
+{
+ unsigned int i;
+
+ memset(frame, 0, sizeof(*frame));
+
+ frame->type = HDMI_INFOFRAME_TYPE_AVI;
+ frame->version = 2;
+ frame->length = 13;
+
+ for (i = 0; i < ARRAY_SIZE(hdmi_cea_modes); i++) {
+ const struct hdmi_cea_mode *cea = &hdmi_cea_modes[i];
+
+ if (mode->hdisplay != cea->width ||
+ mode->vdisplay != cea->height)
+ continue;
+
+ if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && !cea->interlaced)
+ continue;
+
+ frame->active_aspect = HDMI_ACTIVE_ASPECT_PICTURE;
+ frame->picture_aspect = cea->aspect;
+ frame->video_code = cea->vic;
+ break;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(drm_hdmi_avi_infoframe_from_display_mode);
diff --git a/include/drm/drm_hdmi.h b/include/drm/drm_hdmi.h
new file mode 100644
index 0000000..07ce049
--- /dev/null
+++ b/include/drm/drm_hdmi.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2012 Avionic Design GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _DRM_HDMI_H_
+#define _DRM_HDMI_H_
+
+struct hdmi_avi_infoframe;
+struct drm_display_mode;
+
+int drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
+ struct drm_display_mode *mode);
+
+#endif
--
1.8.0
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