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[2001:4c4e:1b83:6900:e58f:c551:6aab:b3e4]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49d26bf332esm2604635e9.8.2026.09.09.09.32.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2026 09:32:28 -0700 (PDT) From: Igor Paunovic To: dri-devel@lists.freedesktop.org Cc: Igor Paunovic , intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sebastian Reichel , Cristian Ciocaltea , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Dmitry Baryshkov , Sandy Huang , Heiko Stuebner , Andy Yan , Jani Nikula , Rodrigo Vivi , Ville Syrjala , Imre Deak , Ankit Nautiyal Subject: [PATCH v2 0/3] drm/dp: shared HDR metadata SDP helper, and max bpc for dw-dp Date: Wed, 9 Sep 2026 18:31:58 +0200 Message-ID: <20260909163206.36409-1-royalnet026@gmail.com> X-Mailer: git-send-email 2.53.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260909_093231_363527_FE33A4A2 X-CRM114-Status: GOOD ( 21.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is v2 of "drm/bridge: synopsys: dw-dp: Add HDR support" [1], resent as three patches instead of five. The two patches that actually enabled HDR output on dw-dp are not here. They were written on top of Sebastian's "Synopsys DisplayPort Controller improvements for RK3588" series, and that series has not landed. I checked rather than assumed: against drm-misc-next they no longer apply, and every failing hunk sits on context that only exists in that series - vsc_sdp_nr, audio_sdp_nr, dw_dp_clear_sdp(), the runtime PM conversion and dw_dp_rockchip_hpd_sw_cfg(). None of those symbols are in mainline. Holding the rest hostage to that seemed wrong when the first three patches stand on their own, so they go alone and I will resend the other two once the dw-dp work is in. What is left is useful without them: 1/3 moves i915's private HDR metadata SDP packing into a shared DP helper and converts i915 to use it. No functional change; the second user follows later. Jani's Ack from v1 is carried over. 2/3 fixes a real bug: the bridge connector loses its max bpc value on connector reset, so a driver that attaches the property gets it reset behind userspace's back. 3/3 attaches the "max bpc" property on dw-dp. To be precise about what that does: the property is a limit, not an enabler. drm_atomic_connector_check() derives max_bpc from the sink's EDID and only clamps it against max_requested_bpc when the property exists, so the min() can never raise it. dw-dp's format filter therefore already lets its 10 bpc entries through on a sink that reports 10 bpc, with no property attached. What the property adds is userspace control - the ability to ask for less - and a defined upper bound of 10, the deepest entry in dw_dp_output_formats[]. It is also the case that motivated 2/3, and a prerequisite for the HDR patches that follow later. Changes in v2: - Dropped 4/5 and 5/5; they depend on the dw-dp improvements series and no longer apply to drm-misc-next. - Retitled the series, since it no longer adds HDR support by itself. - Rebased onto drm-misc-next bf63a72ea005. No changes to the code. One thing worth flagging for 2/3 and 3/3: Cristian's HDMI 2.0 series removes connector->max_bpc in its patch 71. That series is not in drm-misc-next either, so these two are correct as they stand today, but if it lands first I will respin them against whatever replaces that field. Say the word if you would rather I wait for it. A note on how this was made, since the patches carry Assisted-by tags. I work in a pair: I run the board, take the measurements and decide what goes in; an LLM assistant (Claude, by Anthropic) helps me read the source, draft the changelogs and re-check my claims against the tree before I send anything. What I have not done here is boot-test this exact three-patch series on hardware. The code is unchanged from v1, whose runtime testing was done on an Orange Pi 5 Plus running a rockchip-devel kernel that carried the v9 generation of the dw-dp series, with the patches on top; those runtime tests were never repeated on plain drm-misc-next. That caveat bites hardest on 3/3: mainline's dw_dp-rockchip.c is not the file I tested against. For v2 I have only checked that the patches apply and build- tested nothing. Say so and I will do a full build and boot test before you take it. [1] https://lore.kernel.org/all/20260808095749.9428-1-royalnet026@gmail.com/ Igor Paunovic (3): drm/dp: Add drm_dp_hdr_metadata_infoframe_sdp_pack() drm/display: bridge-connector: Preserve max bpc across connector reset drm/rockchip: dw_dp: Attach "max bpc" connector property drivers/gpu/drm/display/drm_bridge_connector.c | 6 +- drivers/gpu/drm/display/drm_dp_helper.c | 88 ++++++++++++++++++++++++++ drivers/gpu/drm/drm_connector.c | 5 ++ drivers/gpu/drm/i915/display/intel_dp.c | 84 +----------------------- drivers/gpu/drm/rockchip/dw_dp-rockchip.c | 26 ++++++++ include/drm/display/drm_dp_helper.h | 4 ++ 6 files changed, 131 insertions(+), 82 deletions(-) base-commit: bf63a72ea005d5e1cc12a9ad5e228c4b44246b0f