[PATCH v3 05/19] videomodes: add helper function to convert from ctfb to display_timing

[Giulio Benetti]

This function converts from "struct ctf_res_modes" to
"struct display_timing".

Signed-off-by: Giulio Benetti <giulio.benetti at benettiengineering.com>
---
V2->V3:
* comment function prototype and make it clear what ctfb is
---
 drivers/video/videomodes.c | 29 +++++++++++++++++++++++++++++
 drivers/video/videomodes.h | 11 +++++++++++
 2 files changed, 40 insertions(+)

diff --git a/drivers/video/videomodes.c b/drivers/video/videomodes.c
index ac25b45f81..89003eea72 100644
--- a/drivers/video/videomodes.c
+++ b/drivers/video/videomodes.c
@@ -444,3 +444,32 @@ int video_edid_dtd_to_ctfb_res_modes(struct edid_detailed_timing *t,
 
 	return 0;
 }
+
+void video_ctfb_mode_to_display_timing(const struct ctfb_res_modes *mode,
+				       struct display_timing *timing)
+{
+	timing->pixelclock.typ = mode->pixclock_khz * 1000;
+
+	timing->hactive.typ = mode->xres;
+	timing->hfront_porch.typ = mode->right_margin;
+	timing->hback_porch.typ = mode->left_margin;
+	timing->hsync_len.typ = mode->hsync_len;
+
+	timing->vactive.typ = mode->yres;
+	timing->vfront_porch.typ = mode->lower_margin;
+	timing->vback_porch.typ = mode->upper_margin;
+	timing->vsync_len.typ = mode->vsync_len;
+
+	timing->flags = 0;
+
+	if (mode->sync & FB_SYNC_HOR_HIGH_ACT)
+		timing->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
+	else
+		timing->flags |= DISPLAY_FLAGS_HSYNC_LOW;
+	if (mode->sync & FB_SYNC_VERT_HIGH_ACT)
+		timing->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
+	else
+		timing->flags |= DISPLAY_FLAGS_VSYNC_LOW;
+	if (mode->vmode == FB_VMODE_INTERLACED)
+		timing->flags |= DISPLAY_FLAGS_INTERLACED;
+}
diff --git a/drivers/video/videomodes.h b/drivers/video/videomodes.h
index 29a3db4ae3..aefe4ef94a 100644
--- a/drivers/video/videomodes.h
+++ b/drivers/video/videomodes.h
@@ -92,3 +92,14 @@ int video_get_option_int(const char *options, const char *name, int def);
 
 int video_edid_dtd_to_ctfb_res_modes(struct edid_detailed_timing *t,
 				     struct ctfb_res_modes *mode);
+/**
+ * video_ctfb_mode_to_display_timing() - Convert a ctfb(Cathode Tube Frame
+ *					 Buffer)_res_modes struct to a
+ *					 display_timing struct.
+ *
+ * @mode:	Input ctfb_res_modes structure pointer to be converted
+ *		from
+ * @timing:	Output display_timing structure pointer to be converted to
+ */
+void video_ctfb_mode_to_display_timing(const struct ctfb_res_modes *mode,
+				       struct display_timing *timing);
-- 
2.20.1