From 2570fe2586254ff174c2ba5a20dabbde707dbb9b Mon Sep 17 00:00:00 2001
From: Shashank Sharma <shashank.sharma@intel.com>
Date: Thu, 13 Jul 2017 21:03:14 +0530
Subject: [PATCH] drm: add helper functions for YCBCR420 handling
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Git-commit: 2570fe2586254ff174c2ba5a20dabbde707dbb9b
Patch-mainline: v4.14-rc1
References: FATE#322643 bsc#1055900
This patch adds helper functions for YCBCR 420 handling.
These functions do:
- check if a given video mode is YCBCR 420 only mode.
- check if a given video mode is YCBCR 420 also mode.
V2: Added YCBCR functions as helpers in DRM layer, instead of keeping it in I915 layer.
V3: Added handling for YCBCR-420 only modes too.
V4: EXPORT_SYMBOL(drm_find_hdmi_output_type)
V5: Addressed review comments from Danvet: - %s/drm_find_hdmi_output_type/drm_display_info_hdmi_output_type - %s/drm_can_support_ycbcr_output/drm_display_supports_ycbcr_output - %s/drm_can_support_this_ycbcr_output/ drm_display_supports_this_ycbcr_output - pass drm_display_info instead of drm_connector for consistency - For drm_get_highest_quality_ycbcr_supported doc, move the variable description above, and then the function description.
V6: Add only YCBCR420 helpers (Ville)
V7: Addressed review comments from Ville - Remove cea_vic_valid() check. - Fix indentation. - Make input parameters to helpers, const.
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jose Abreu <Jose.Abreu@synopsys.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1499960000-9232-9-git-send-email-shashank.sharma@intel.com
[vsyrjala: Fix sparse indentation warn]
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/drm_modes.c | 58 ++++++++++++++++++++++++++++++++++++++++++++
include/drm/drm_modes.h | 6 ++++
2 files changed, 64 insertions(+)
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1605,3 +1605,61 @@ int drm_mode_convert_umode(struct drm_di
out:
return ret;
}
+
+/**
+ * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
+ * output format
+ *
+ * @connector: drm connector under action.
+ * @mode: video mode to be tested.
+ *
+ * Returns:
+ * true if the mode can be supported in YCBCR420 format
+ * false if not.
+ */
+bool drm_mode_is_420_only(const struct drm_display_info *display,
+ const struct drm_display_mode *mode)
+{
+ u8 vic = drm_match_cea_mode(mode);
+
+ return test_bit(vic, display->hdmi.y420_vdb_modes);
+}
+EXPORT_SYMBOL(drm_mode_is_420_only);
+
+/**
+ * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
+ * output format also (along with RGB/YCBCR444/422)
+ *
+ * @display: display under action.
+ * @mode: video mode to be tested.
+ *
+ * Returns:
+ * true if the mode can be support YCBCR420 format
+ * false if not.
+ */
+bool drm_mode_is_420_also(const struct drm_display_info *display,
+ const struct drm_display_mode *mode)
+{
+ u8 vic = drm_match_cea_mode(mode);
+
+ return test_bit(vic, display->hdmi.y420_cmdb_modes);
+}
+EXPORT_SYMBOL(drm_mode_is_420_also);
+/**
+ * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
+ * output format
+ *
+ * @display: display under action.
+ * @mode: video mode to be tested.
+ *
+ * Returns:
+ * true if the mode can be supported in YCBCR420 format
+ * false if not.
+ */
+bool drm_mode_is_420(const struct drm_display_info *display,
+ const struct drm_display_mode *mode)
+{
+ return drm_mode_is_420_only(display, mode) ||
+ drm_mode_is_420_also(display, mode);
+}
+EXPORT_SYMBOL(drm_mode_is_420);
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -452,6 +452,12 @@ int drm_mode_convert_umode(struct drm_di
const struct drm_mode_modeinfo *in);
void drm_mode_probed_add(struct drm_connector *connector, struct drm_display_mode *mode);
void drm_mode_debug_printmodeline(const struct drm_display_mode *mode);
+bool drm_mode_is_420_only(const struct drm_display_info *display,
+ const struct drm_display_mode *mode);
+bool drm_mode_is_420_also(const struct drm_display_info *display,
+ const struct drm_display_mode *mode);
+bool drm_mode_is_420(const struct drm_display_info *display,
+ const struct drm_display_mode *mode);
struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
int hdisplay, int vdisplay, int vrefresh,