linux-kernel - [PATCH v4 01/11] phy: hdmi: Add HDMI 2.1 FRL configuration options

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Message-Id: <20250902-phy-hdptx-frl-v4-1-7d69176373ce@collabora.com>
Date: Tue, 02 Sep 2025 23:44:36 +0300
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Heiko Stuebner <heiko@...ech.de>, Algea Cao <algea.cao@...k-chips.com>, 
 Dmitry Baryshkov <lumag@...nel.org>
Cc: kernel@...labora.com, linux-phy@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org
Subject: [PATCH v4 01/11] phy: hdmi: Add HDMI 2.1 FRL configuration options

The HDMI 2.1 specification introduced the Fixed Rate Link (FRL) mode,
aiming to replace the older Transition-Minimized Differential Signaling
(TMDS) mode used in previous HDMI versions to support much higher
bandwidths (up to 48 Gbps) for modern video and audio formats.

FRL has been designed to support ultra high resolution formats at high
refresh rates like 8K@...z or 4K@...Hz, and eliminates the need for
dynamic bandwidth adjustments, which reduces latency.  It operates with
3 or 4 lanes at different link rates: 3Gbps, 6Gbps, 8Gbps, 10Gbps or
12Gbps.

Add support for configuring the FRL mode for HDMI PHYs.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
---
 include/linux/phy/phy-hdmi.h | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/include/linux/phy/phy-hdmi.h b/include/linux/phy/phy-hdmi.h
index f0ec963c6e84f1b7728acafc824dff191c6b873d..d4cf4430ee8f3bf0f18a109c5a7640293a4293b1 100644
--- a/include/linux/phy/phy-hdmi.h
+++ b/include/linux/phy/phy-hdmi.h
@@ -6,16 +6,31 @@
 #ifndef __PHY_HDMI_H_
 #define __PHY_HDMI_H_
 
+#include <linux/types.h>
+
+enum phy_hdmi_mode {
+	PHY_HDMI_MODE_TMDS,
+	PHY_HDMI_MODE_FRL,
+};
+
 /**
  * struct phy_configure_opts_hdmi - HDMI configuration set
- * @tmds_char_rate: HDMI TMDS Character Rate in Hertz.
  * @bpc: Bits per color channel.
+ * @tmds_char_rate: HDMI TMDS Character Rate in Hertz.
+ * @frl.rate_per_lane: HDMI FRL Rate per Lane in Gbps.
+ * @frl.lanes: HDMI FRL lanes count.
  *
  * This structure is used to represent the configuration state of a HDMI phy.
  */
 struct phy_configure_opts_hdmi {
-	unsigned long long tmds_char_rate;
 	unsigned int bpc;
+	union {
+		unsigned long long tmds_char_rate;
+		struct {
+			u8 rate_per_lane;
+			u8 lanes;
+		} frl;
+	};
 };
 
 #endif /* __PHY_HDMI_H_ */

-- 
2.51.0