drm: Add HDMI infoframe helpers
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@avionic-design.de> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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@ -7,6 +7,7 @@
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menuconfig DRM
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tristate "Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)"
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depends on (AGP || AGP=n) && !EMULATED_CMPXCHG && MMU
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select HDMI
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select I2C
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select I2C_ALGOBIT
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select DMA_SHARED_BUFFER
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@ -29,6 +29,7 @@
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/hdmi.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <drm/drmP.h>
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@ -2856,3 +2857,35 @@ int drm_add_modes_noedid(struct drm_connector *connector,
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return num_modes;
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}
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EXPORT_SYMBOL(drm_add_modes_noedid);
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/**
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* drm_hdmi_avi_infoframe_from_display_mode() - fill an HDMI AVI infoframe with
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* data from a DRM display mode
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* @frame: HDMI AVI infoframe
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* @mode: DRM display mode
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*
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* Returns 0 on success or a negative error code on failure.
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*/
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int
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drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
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const struct drm_display_mode *mode)
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{
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int err;
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if (!frame || !mode)
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return -EINVAL;
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err = hdmi_avi_infoframe_init(frame);
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if (err < 0)
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return err;
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frame->video_code = drm_match_cea_mode(mode);
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if (!frame->video_code)
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return 0;
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frame->picture_aspect = HDMI_PICTURE_ASPECT_NONE;
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frame->active_aspect = HDMI_ACTIVE_ASPECT_PICTURE;
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return 0;
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}
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EXPORT_SYMBOL(drm_hdmi_avi_infoframe_from_display_mode);
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@ -247,6 +247,8 @@ struct edid {
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struct drm_encoder;
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struct drm_connector;
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struct drm_display_mode;
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struct hdmi_avi_infoframe;
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void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid);
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int drm_av_sync_delay(struct drm_connector *connector,
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struct drm_display_mode *mode);
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@ -254,4 +256,8 @@ struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
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struct drm_display_mode *mode);
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int drm_load_edid_firmware(struct drm_connector *connector);
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int
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drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
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const struct drm_display_mode *mode);
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#endif /* __DRM_EDID_H__ */
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