From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B31CA2C1E2E; Mon, 5 May 2025 22:50:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746485407; cv=none; b=OYnORzyxfJuk5ImWB8PfB4rK8sIVBq3fqZCNjqyvHuSzNoFPaYHYFXLeoOVxlV5gjqtTurA++hQ0eCjohOlSFg7P8wBKc/wfOPQZo6ZPcLh4q30UV5JKRvJLiStrankQNQ/S5cIaddYpnp8I31DJbf1S2duF6oxdlssHE2QWLYo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746485407; c=relaxed/simple; bh=TmMziUAO7Ca/u8ecyVo8LJZtOW71FIb95pElB9+CaSA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=r0AG08eFg+AohTkEbpAd+TjneL68+ownuls9VUcapUV4b3sLVhdYKiqzxUOEQMOPEdlfzVulP8WqultQgG/GwXNVFX48th4SYFOFgVYD20Ytcl5FgdITT7dNT7jY2pKMqEqlKjuPRB52b936dd0ntfbVGYn8C4bhW45XBdtNmAc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Wgy7cuhw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Wgy7cuhw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C19B0C4CEED; Mon, 5 May 2025 22:50:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746485407; bh=TmMziUAO7Ca/u8ecyVo8LJZtOW71FIb95pElB9+CaSA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Wgy7cuhwyWy5mEIJydT180q+bg1t7TcbNaILhZa8XHcj8rzFr6Wv6H/GcmP9ZQ1b9 8PUVlplCSzo4o+sfGfzln6senT5/UxiggoGrL+4xkcSv5XRCD2S6wKQ0JBnRI95LmV ONMq/6DPnWgCAQNsoW0+9XVK03JABZgjSIPzVQOedoy/8JI/LlbDpvZ0lawUze02Rf 8RNsZ7OEy0j1aUh2d32dtDxjn0UeqALqtzrtndHK+hJxW+yu/W3T/7C4hEWbEeOFAG dPiHfDJvOdwXJuupRBZ6CiUACd+K1KWH2K/F/GScn+IH3H1B0WBzMEttKHtbqjxbtJ Hc6P2FD+Idnqw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: George Shen , Wenjing Liu , Roman Li , Daniel Wheeler , Alex Deucher , Sasha Levin , harry.wentland@amd.com, sunpeng.li@amd.com, christian.koenig@amd.com, airlied@gmail.com, simona@ffwll.ch, wayne.lin@amd.com, Gabe.Teeger@amd.com, michael.strauss@amd.com, Hansen.Dsouza@amd.com, robin.chen@amd.com, Cruise.Hung@amd.com, ryanseto@amd.com, alex.hung@amd.com, PeiChen.Huang@amd.com, Ausef.Yousof@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.12 303/486] drm/amd/display: Read LTTPR ALPM caps during link cap retrieval Date: Mon, 5 May 2025 18:36:19 -0400 Message-Id: <20250505223922.2682012-303-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505223922.2682012-1-sashal@kernel.org> References: <20250505223922.2682012-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.12.26 Content-Transfer-Encoding: 8bit From: George Shen [ Upstream commit de84d580126eb2214937df755cfec5ef0901479e ] [Why] The latest DP spec requires the DP TX to read DPCD F0000h through F0009h when detecting LTTPR capabilities for the first time. [How] Update LTTPR cap retrieval to read up to F0009h (two more bytes than the previous F0007h), and store the LTTPR ALPM capabilities. Reviewed-by: Wenjing Liu Signed-off-by: George Shen Signed-off-by: Roman Li Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/dc/dc_dp_types.h | 12 ++++++++++++ .../display/dc/link/protocols/link_dp_capability.c | 6 +++++- 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h index 41bd95e9177a4..223c3d55544b2 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h @@ -959,6 +959,14 @@ union dp_128b_132b_supported_lttpr_link_rates { uint8_t raw; }; +union dp_alpm_lttpr_cap { + struct { + uint8_t AUX_LESS_ALPM_SUPPORTED :1; + uint8_t RESERVED :7; + } bits; + uint8_t raw; +}; + union dp_sink_video_fallback_formats { struct { uint8_t dp_1024x768_60Hz_24bpp_support :1; @@ -1103,6 +1111,7 @@ struct dc_lttpr_caps { uint8_t max_ext_timeout; union dp_main_link_channel_coding_lttpr_cap main_link_channel_coding; union dp_128b_132b_supported_lttpr_link_rates supported_128b_132b_rates; + union dp_alpm_lttpr_cap alpm; uint8_t aux_rd_interval[MAX_REPEATER_CNT - 1]; }; @@ -1352,6 +1361,9 @@ struct dp_trace { #ifndef DPCD_MAX_UNCOMPRESSED_PIXEL_RATE_CAP #define DPCD_MAX_UNCOMPRESSED_PIXEL_RATE_CAP 0x221c #endif +#ifndef DP_LTTPR_ALPM_CAPABILITIES +#define DP_LTTPR_ALPM_CAPABILITIES 0xF0009 +#endif #ifndef DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE #define DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE 0x50 #endif diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c index d9a1e1a599674..842636c7922b4 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c @@ -1495,7 +1495,7 @@ static bool dpcd_read_sink_ext_caps(struct dc_link *link) enum dc_status dp_retrieve_lttpr_cap(struct dc_link *link) { - uint8_t lttpr_dpcd_data[8] = {0}; + uint8_t lttpr_dpcd_data[10] = {0}; enum dc_status status; bool is_lttpr_present; @@ -1545,6 +1545,10 @@ enum dc_status dp_retrieve_lttpr_cap(struct dc_link *link) lttpr_dpcd_data[DP_PHY_REPEATER_128B132B_RATES - DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV]; + link->dpcd_caps.lttpr_caps.alpm.raw = + lttpr_dpcd_data[DP_LTTPR_ALPM_CAPABILITIES - + DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV]; + /* If this chip cap is set, at least one retimer must exist in the chain * Override count to 1 if we receive a known bad count (0 or an invalid value) */ if ((link->chip_caps & EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN) && -- 2.39.5