[PATCH v2 2/5] drm/edid: Abstract away cea_edid_modes[]

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

We're going to need two cea mode tables (on for VICs < 128,
another one for VICs >= 193). To that end replace the direct
edid_cea_modes[] lookups with a function call. And we'll rename
the array to edid_cea_modes_0[] to indicathe how it's to be
indexed.

Cc: Hans Verkuil <hansverk at cisco.com>
Cc: Shashank Sharma <shashank.sharma at intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/drm_edid.c | 80 +++++++++++++++++++++++++++-----------
 1 file changed, 58 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index bcd9ed569d64..703d2bc26fd9 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -707,12 +707,11 @@ static const struct minimode extra_modes[] = {
 };
 
 /*
- * Probably taken from CEA-861 spec.
- * This table is converted from xorg's hw/xfree86/modes/xf86EdidModes.c.
+ * From CEA/CTA-861 spec.
  *
- * Index using the VIC.
+ * Index with VIC.
  */
-static const struct drm_display_mode edid_cea_modes[] = {
+static const struct drm_display_mode edid_cea_modes_0[] = {
 	/* 0 - dummy, VICs start at 1 */
 	{ },
 	/* 1 - 640x480 at 60Hz 4:3 */
@@ -3067,6 +3066,25 @@ static u8 *drm_find_cea_extension(const struct edid *edid)
 	return cea;
 }
 
+static const struct drm_display_mode *cea_mode_for_vic(u8 vic)
+{
+	if (!vic)
+		return NULL;
+	if (vic < ARRAY_SIZE(edid_cea_modes_0))
+		return &edid_cea_modes_0[vic];
+	return NULL;
+}
+
+static u8 cea_num_vics(void)
+{
+	return ARRAY_SIZE(edid_cea_modes_0);
+}
+
+static u8 cea_next_vic(u8 vic)
+{
+	return vic + 1;
+}
+
 /*
  * Calculate the alternate clock for the CEA mode
  * (60Hz vs. 59.94Hz etc.)
@@ -3104,14 +3122,14 @@ cea_mode_alternate_timings(u8 vic, struct drm_display_mode *mode)
 	 * get the other variants by simply increasing the
 	 * vertical front porch length.
 	 */
-	BUILD_BUG_ON(edid_cea_modes[8].vtotal != 262 ||
-		     edid_cea_modes[9].vtotal != 262 ||
-		     edid_cea_modes[12].vtotal != 262 ||
-		     edid_cea_modes[13].vtotal != 262 ||
-		     edid_cea_modes[23].vtotal != 312 ||
-		     edid_cea_modes[24].vtotal != 312 ||
-		     edid_cea_modes[27].vtotal != 312 ||
-		     edid_cea_modes[28].vtotal != 312);
+	BUILD_BUG_ON(cea_mode_for_vic(8)->vtotal != 262 ||
+		     cea_mode_for_vic(9)->vtotal != 262 ||
+		     cea_mode_for_vic(12)->vtotal != 262 ||
+		     cea_mode_for_vic(13)->vtotal != 262 ||
+		     cea_mode_for_vic(23)->vtotal != 312 ||
+		     cea_mode_for_vic(24)->vtotal != 312 ||
+		     cea_mode_for_vic(27)->vtotal != 312 ||
+		     cea_mode_for_vic(28)->vtotal != 312);
 
 	if (((vic == 8 || vic == 9 ||
 	      vic == 12 || vic == 13) && mode->vtotal < 263) ||
@@ -3139,10 +3157,16 @@ static u8 drm_match_cea_mode_clock_tolerance(const struct drm_display_mode *to_m
 	if (to_match->picture_aspect_ratio)
 		match_flags |= DRM_MODE_MATCH_ASPECT_RATIO;
 
-	for (vic = 1; vic < ARRAY_SIZE(edid_cea_modes); vic++) {
-		struct drm_display_mode cea_mode = edid_cea_modes[vic];
+	for (vic = 1; vic < cea_num_vics(); vic = cea_next_vic(vic)) {
+		const struct drm_display_mode *mode = cea_mode_for_vic(vic);
+		struct drm_display_mode cea_mode;
 		unsigned int clock1, clock2;
 
+		if (!mode)
+			continue;
+
+		cea_mode = *mode;
+
 		/* Check both 60Hz and 59.94Hz */
 		clock1 = cea_mode.clock;
 		clock2 = cea_mode_alternate_clock(&cea_mode);
@@ -3178,10 +3202,16 @@ u8 drm_match_cea_mode(const struct drm_display_mode *to_match)
 	if (to_match->picture_aspect_ratio)
 		match_flags |= DRM_MODE_MATCH_ASPECT_RATIO;
 
-	for (vic = 1; vic < ARRAY_SIZE(edid_cea_modes); vic++) {
-		struct drm_display_mode cea_mode = edid_cea_modes[vic];
+	for (vic = 1; vic < cea_num_vics(); vic = cea_next_vic(vic)) {
+		const struct drm_display_mode *mode = cea_mode_for_vic(vic);
+		struct drm_display_mode cea_mode;
 		unsigned int clock1, clock2;
 
+		if (!mode)
+			continue;
+
+		cea_mode = *mode;
+
 		/* Check both 60Hz and 59.94Hz */
 		clock1 = cea_mode.clock;
 		clock2 = cea_mode_alternate_clock(&cea_mode);
@@ -3202,7 +3232,7 @@ EXPORT_SYMBOL(drm_match_cea_mode);
 
 static bool drm_valid_cea_vic(u8 vic)
 {
-	return vic > 0 && vic < ARRAY_SIZE(edid_cea_modes);
+	return cea_mode_for_vic(vic) != NULL;
 }
 
 /**
@@ -3214,7 +3244,13 @@ static bool drm_valid_cea_vic(u8 vic)
  */
 enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code)
 {
-	return edid_cea_modes[video_code].picture_aspect_ratio;
+	const struct drm_display_mode *mode;
+
+	mode = cea_mode_for_vic(video_code);
+	if (mode)
+		return mode->picture_aspect_ratio;
+
+	return HDMI_PICTURE_ASPECT_NONE;
 }
 EXPORT_SYMBOL(drm_get_cea_aspect_ratio);
 
@@ -3323,7 +3359,7 @@ add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
 		unsigned int clock1, clock2;
 
 		if (drm_valid_cea_vic(vic)) {
-			cea_mode = &edid_cea_modes[vic];
+			cea_mode = cea_mode_for_vic(vic);
 			clock2 = cea_mode_alternate_clock(cea_mode);
 		} else {
 			vic = drm_match_hdmi_mode(mode);
@@ -3398,7 +3434,7 @@ drm_display_mode_from_vic_index(struct drm_connector *connector,
 	if (!drm_valid_cea_vic(vic))
 		return NULL;
 
-	newmode = drm_mode_duplicate(dev, &edid_cea_modes[vic]);
+	newmode = drm_mode_duplicate(dev, cea_mode_for_vic(vic));
 	if (!newmode)
 		return NULL;
 
@@ -3432,7 +3468,7 @@ static int do_y420vdb_modes(struct drm_connector *connector,
 		if (!drm_valid_cea_vic(vic))
 			continue;
 
-		newmode = drm_mode_duplicate(dev, &edid_cea_modes[vic]);
+		newmode = drm_mode_duplicate(dev, cea_mode_for_vic(vic));
 		if (!newmode)
 			break;
 		bitmap_set(hdmi->y420_vdb_modes, vic, 1);
@@ -4001,7 +4037,7 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode)
 	vic = drm_match_cea_mode_clock_tolerance(mode, 5);
 	if (drm_valid_cea_vic(vic)) {
 		type = "CEA";
-		cea_mode = &edid_cea_modes[vic];
+		cea_mode = cea_mode_for_vic(vic);
 		clock1 = cea_mode->clock;
 		clock2 = cea_mode_alternate_clock(cea_mode);
 	} else {
-- 
2.21.0