From 7553770cdc50d237d6f160fd20da8dce1faef0d2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Fri, 15 Oct 2021 16:39:02 +0300
Subject: drm/i915/hdmi: Split intel_hdmi_bpc_possible() to source vs. sink
 pair
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Git-commit: 3cf460bd683df848c3df90b9bd6c28bc86acea8a
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

intel_hdmi_bpc_possible() is used by the DP code as well where
the native HDMI source limits do not apply. So let's split this
into a pair of functions: one for the source vs. one for the sink.

This is basically reverting some of commit 41828125acd6 ("drm/i915:
Move platform checks into intel_hdmi_bpc_possible()") slightly,
but in a nicer form. I guess I forgot at the time that the DP side
uses this too.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211015133921.4609-2-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/i915/display/intel_hdmi.c | 38 ++++++++++++++++-------
 1 file changed, 26 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 371736bdc01f..2fdebda547bc 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -1874,18 +1874,29 @@ static int intel_hdmi_port_clock(int clock, int bpc)
 	return clock * bpc / 8;
 }
 
-static bool intel_hdmi_bpc_possible(struct drm_connector *connector,
-				    int bpc, bool has_hdmi_sink, bool ycbcr420_output)
+static bool intel_hdmi_source_bpc_possible(struct drm_i915_private *i915, int bpc)
+{
+	switch (bpc) {
+	case 12:
+		return !HAS_GMCH(i915);
+	case 10:
+		return DISPLAY_VER(i915) >= 11;
+	case 8:
+		return true;
+	default:
+		MISSING_CASE(bpc);
+		return false;
+	}
+}
+
+static bool intel_hdmi_sink_bpc_possible(struct drm_connector *connector,
+					 int bpc, bool has_hdmi_sink, bool ycbcr420_output)
 {
-	struct drm_i915_private *i915 = to_i915(connector->dev);
 	const struct drm_display_info *info = &connector->display_info;
 	const struct drm_hdmi_info *hdmi = &info->hdmi;
 
 	switch (bpc) {
 	case 12:
-		if (HAS_GMCH(i915))
-			return false;
-
 		if (!has_hdmi_sink)
 			return false;
 
@@ -1894,9 +1905,6 @@ static bool intel_hdmi_bpc_possible(struct drm_connector *connector,
 		else
 			return info->edid_hdmi_dc_modes & DRM_EDID_HDMI_DC_36;
 	case 10:
-		if (DISPLAY_VER(i915) < 11)
-			return false;
-
 		if (!has_hdmi_sink)
 			return false;
 
@@ -1916,6 +1924,7 @@ static enum drm_mode_status
 intel_hdmi_mode_clock_valid(struct drm_connector *connector, int clock,
 			    bool has_hdmi_sink, bool ycbcr420_output)
 {
+	struct drm_i915_private *i915 = to_i915(connector->dev);
 	struct intel_hdmi *hdmi = intel_attached_hdmi(to_intel_connector(connector));
 	enum drm_mode_status status;
 
@@ -1928,13 +1937,15 @@ intel_hdmi_mode_clock_valid(struct drm_connector *connector, int clock,
 
 	/* if we can't do 8bpc we may still be able to do 12bpc */
 	if (status != MODE_OK &&
-	    intel_hdmi_bpc_possible(connector, 12, has_hdmi_sink, ycbcr420_output))
+	    intel_hdmi_source_bpc_possible(i915, 12) &&
+	    intel_hdmi_sink_bpc_possible(connector, 12, has_hdmi_sink, ycbcr420_output))
 		status = hdmi_port_clock_valid(hdmi, intel_hdmi_port_clock(clock, 12),
 					       true, has_hdmi_sink);
 
 	/* if we can't do 8,12bpc we may still be able to do 10bpc */
 	if (status != MODE_OK &&
-	    intel_hdmi_bpc_possible(connector, 10, has_hdmi_sink, ycbcr420_output))
+	    intel_hdmi_source_bpc_possible(i915, 10) &&
+	    intel_hdmi_sink_bpc_possible(connector, 10, has_hdmi_sink, ycbcr420_output))
 		status = hdmi_port_clock_valid(hdmi, intel_hdmi_port_clock(clock, 10),
 					       true, has_hdmi_sink);
 
@@ -2000,7 +2011,7 @@ bool intel_hdmi_deep_color_possible(const struct intel_crtc_state *crtc_state,
 		if (connector_state->crtc != crtc_state->uapi.crtc)
 			continue;
 
-		if (!intel_hdmi_bpc_possible(connector, bpc, has_hdmi_sink, ycbcr420_output))
+		if (!intel_hdmi_sink_bpc_possible(connector, bpc, has_hdmi_sink, ycbcr420_output))
 			return false;
 	}
 
@@ -2015,6 +2026,9 @@ static bool hdmi_deep_color_possible(const struct intel_crtc_state *crtc_state,
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
 
+	if (!intel_hdmi_source_bpc_possible(dev_priv, bpc))
+		return false;
+
 	/*
 	 * HDMI deep color affects the clocks, so it's only possible
 	 * when not cloning with other encoder types.
-- 
2.38.1