From 92669460ec6eb825092e949ddcdbaa73ba5774c7 Mon Sep 17 00:00:00 2001 From: Cristian Ciocaltea Date: Fri, 30 May 2025 00:56:48 +0300 Subject: [PATCH 083/113] FROMLIST(v4): 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@60Hz or 4K@120Hz, 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 --- 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 f0ec963c6e84..d4cf4430ee8f 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 + +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_ */ -- 2.34.1