From patchwork Tue Oct 6 09:47:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ankit Nautiyal X-Patchwork-Id: 11818405 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 458B56CA for ; Tue, 6 Oct 2020 09:54:45 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2176820674 for ; Tue, 6 Oct 2020 09:54:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2176820674 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D3EB46E43F; Tue, 6 Oct 2020 09:54:39 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 42D026E441; Tue, 6 Oct 2020 09:54:39 +0000 (UTC) IronPort-SDR: hM/+lsmwH1jEcWEZhiK814283aWSlFk1tIVnE76bfdi70pt4DAOOv5S7QcvJr4ViPOmDvZlUQV aZ8ZfY/omQ3Q== X-IronPort-AV: E=McAfee;i="6000,8403,9765"; a="151361693" X-IronPort-AV: E=Sophos;i="5.77,342,1596524400"; d="scan'208";a="151361693" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Oct 2020 02:54:38 -0700 IronPort-SDR: IOIQn/brO+HTAzdbpn4b9JdUGGlDsgzcOe9Zd4FOk+VNw08TlJjhMPNDw+zS8+dxyv4bPsTGfB X7JjLc8kQM2Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,342,1596524400"; d="scan'208";a="342171766" Received: from unknown (HELO linux-akn.iind.intel.com) ([10.223.34.148]) by fmsmga004.fm.intel.com with ESMTP; 06 Oct 2020 02:54:35 -0700 From: Ankit Nautiyal To: intel-gfx@lists.freedesktop.org Subject: [RFC 3/8] drm/dp_helper: Add FRL training support for a DP-HDMI2.1 PCON Date: Tue, 6 Oct 2020 15:17:14 +0530 Message-Id: <20201006094719.24119-4-ankit.k.nautiyal@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201006094719.24119-1-ankit.k.nautiyal@intel.com> References: <20201006094719.24119-1-ankit.k.nautiyal@intel.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: vandita.kulkarni@intel.com, uma.shankar@intel.com, dri-devel@lists.freedesktop.org, swati2.sharma@intel.com MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This patch adds support for configuring a PCON device, connected as a DP branched device to enable FRL Link training with a HDMI2.1 + sink. v2: Minor changes: -removed unnecessary argument supplied to a drm helper function. -fixed return value for max frl read from pcon. Signed-off-by: Ankit Nautiyal --- drivers/gpu/drm/drm_dp_helper.c | 305 ++++++++++++++++++++++++++++++++ include/drm/drm_dp_helper.h | 80 +++++++++ 2 files changed, 385 insertions(+) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 478dd51f738d..39d8e4d665b7 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -2366,3 +2366,308 @@ void drm_dp_vsc_sdp_log(const char *level, struct device *dev, #undef DP_SDP_LOG } EXPORT_SYMBOL(drm_dp_vsc_sdp_log); + +/** + * drm_dp_get_pcon_max_frl_bw() - maximum frl supported by PCON + * @dpcd: DisplayPort configuration data + * @port_cap: port capabilities + * + * Returns maximum frl bandwidth supported by PCON in GBPS, + * returns 0 if not supported. + **/ +int drm_dp_get_pcon_max_frl_bw(const u8 dpcd[DP_RECEIVER_CAP_SIZE], + const u8 port_cap[4]) +{ + int bw; + u8 buf; + + buf = port_cap[2]; + bw = buf & DP_PCON_MAX_FRL_BW; + + switch (bw) { + case DP_PCON_MAX_9GBPS: + return 9; + case DP_PCON_MAX_18GBPS: + return 18; + case DP_PCON_MAX_24GBPS: + return 24; + case DP_PCON_MAX_32GBPS: + return 32; + case DP_PCON_MAX_40GBPS: + return 40; + case DP_PCON_MAX_48GBPS: + return 48; + case DP_PCON_MAX_0GBPS: + default: + return 0; + } + + return 0; +} +EXPORT_SYMBOL(drm_dp_get_pcon_max_frl_bw); + +/** + * drm_dp_get_hdmi_max_frl_bw() - maximum frl supported by HDMI Sink + * @aux: DisplayPort AUX channel + * + * Returns maximum frl bandwidth supported by HDMI in Gbps on success, + * returns 0, if not supported. + **/ +int drm_dp_get_hdmi_max_frl_bw(struct drm_dp_aux *aux) +{ + u8 buf; + int bw, ret; + + ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_SINK, &buf); + if (ret < 0) + return 0; + bw = buf & DP_HDMI_SINK_LINK_BW; + + switch (bw) { + case DP_HDMI_SINK_BW_9GBPS: + return 9; + case DP_HDMI_SINK_BW_18GBPS: + return 18; + case DP_HDMI_SINK_BW_24GBPS: + return 24; + case DP_HDMI_SINK_BW_32GBPS: + return 32; + case DP_HDMI_SINK_BW_40GBPS: + return 40; + case DP_HDMI_SINK_BW_48GBPS: + return 48; + case DP_HDMI_SINK_BW_0GBPS: + default: + return 0; + } + + return 0; +} +EXPORT_SYMBOL(drm_dp_get_hdmi_max_frl_bw); + +/** + * drm_dp_pcon_frl_prepare() - Prepare PCON for FRL. + * @aux: DisplayPort AUX channel + * + * Returns 0 if success, else returns negative error code. + **/ +int drm_dp_pcon_frl_prepare(struct drm_dp_aux *aux, bool enable_frl_ready_hpd) +{ + int ret; + u8 buf = DP_PCON_ENABLE_SOURCE_CTL_MODE | + DP_PCON_ENABLE_LINK_FRL_MODE; + + if (enable_frl_ready_hpd) + buf |= DP_PCON_ENABLE_HPD_READY; + + ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, buf); + + return ret; +} +EXPORT_SYMBOL(drm_dp_pcon_frl_prepare); + +/** + * drm_dp_pcon_is_frl_ready() - Is PCON ready for FRL + * @aux: DisplayPort AUX channel + * + * Returns true if success, else returns false. + **/ +bool drm_dp_pcon_is_frl_ready(struct drm_dp_aux *aux) +{ + int ret; + u8 buf; + + ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_TX_LINK_STATUS, &buf); + if (ret < 0) + return false; + + if (buf & DP_PCON_FRL_READY) + return true; + + return false; +} +EXPORT_SYMBOL(drm_dp_pcon_is_frl_ready); + +/** + * drm_dp_pcon_frl_configure_1() - Set HDMI LINK Configuration-Step1 + * @aux: DisplayPort AUX channel + * max_frl_mask: mask for selecting the bandwidths supported by source, + * to be tried by Pcon f/w. + * @concurrent_mode: true if concurrent mode or operation is required, + * false otherwise. + * + * Returns 0 if success, else returns negative error code. + **/ + +int drm_dp_pcon_frl_configure_1(struct drm_dp_aux *aux, int max_frl_gbps, + bool concurrent_mode) +{ + int ret; + u8 buf; + + ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_LINK_CONFIG_1, &buf); + if (ret < 0) + return ret; + + if (concurrent_mode) + buf |= DP_PCON_ENABLE_CONCURRENT_LINK; + else + buf &= ~DP_PCON_ENABLE_CONCURRENT_LINK; + + switch (max_frl_gbps) { + case 9: + buf |= DP_PCON_ENABLE_MAX_BW_9GBPS; + break; + case 18: + buf |= DP_PCON_ENABLE_MAX_BW_18GBPS; + break; + case 24: + buf |= DP_PCON_ENABLE_MAX_BW_24GBPS; + break; + case 32: + buf |= DP_PCON_ENABLE_MAX_BW_32GBPS; + break; + case 40: + buf |= DP_PCON_ENABLE_MAX_BW_40GBPS; + break; + case 48: + buf |= DP_PCON_ENABLE_MAX_BW_48GBPS; + break; + case 0: + buf |= DP_PCON_ENABLE_MAX_BW_0GBPS; + break; + default: + return -EINVAL; + } + + ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, buf); + if (ret < 0) + return ret; + + return 0; +} +EXPORT_SYMBOL(drm_dp_pcon_frl_configure_1); + +/** + * drm_dp_pcon_frl_configure_2() - Set HDMI Link configuration Step-2 + * @aux: DisplayPort AUX channel + * @max_frl_mask : Max FRL BW to be tried by the PCON with HDMI Sink + * @extended_train_mode : true for Extended Mode, false for Normal Mode. + * In Normal mode, the PCON tries each frl bw from the max_frl_mask starting + * from min, and stops when link training is successful. In Extended mode, all + * frl bw selected in the mask are trained by the PCON. + * + * Returns 0 if success, else returns negative error code. + **/ +int drm_dp_pcon_frl_configure_2(struct drm_dp_aux *aux, int max_frl_mask, + bool extended_train_mode) +{ + int ret; + u8 buf = 0; + + buf |= max_frl_mask; + + if (extended_train_mode) + buf |= DP_PCON_FRL_LINK_TRAIN_EXTENDED; + + ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_2, buf); + if (ret < 0) + return ret; + + return 0; +} +EXPORT_SYMBOL(drm_dp_pcon_frl_configure_2); + +/** + * drm_dp_pcon_reset_frl_config() - Re-Set HDMI Link configuration. + * @aux: DisplayPort AUX channel + * + * Returns 0 if success, else returns negative error code. + **/ +int drm_dp_pcon_reset_frl_config(struct drm_dp_aux *aux) +{ + int ret; + + ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, 0x0); + if (ret < 0) + return ret; + + return 0; +} +EXPORT_SYMBOL(drm_dp_pcon_reset_frl_config); + +/** + * drm_dp_pcon_frl_enable() - Enable HDMI link through FRL + * @aux: DisplayPort AUX channel + * + * Returns 0 if success, else returns negative error code. + **/ +int drm_dp_pcon_frl_enable(struct drm_dp_aux *aux) +{ + int ret; + u8 buf = 0; + + ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_LINK_CONFIG_1, &buf); + if (ret < 0) + return ret; + if (!(buf & DP_PCON_ENABLE_SOURCE_CTL_MODE)) { + DRM_DEBUG_KMS("PCON in Autonomous mode, can't enable FRL\n"); + return -EINVAL; + } + buf |= DP_PCON_ENABLE_HDMI_LINK; + ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, buf); + if (ret < 0) + return ret; + + return 0; +} +EXPORT_SYMBOL(drm_dp_pcon_frl_enable); + +/** + * drm_dp_pcon_hdmi_link_active() - check if the PCON HDMI LINK status is active. + * @aux: DisplayPort AUX channel + * + * Returns true if link is active else returns false. + **/ +bool drm_dp_pcon_hdmi_link_active(struct drm_dp_aux *aux) +{ + u8 buf; + int ret; + + ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_TX_LINK_STATUS, &buf); + if (ret < 0) + return false; + + return buf & DP_PCON_HDMI_TX_LINK_ACTIVE; +} +EXPORT_SYMBOL(drm_dp_pcon_hdmi_link_active); + +/** + * drm_dp_pcon_hdmi_link_mode() - get the PCON HDMI LINK MODE + * @aux: DisplayPort AUX channel + * @frl_trained_mask: pointer to store bitmask of the trained bw configuration. + * Valid only if the MODE returned is FRL. For Normal Link training mode + * only 1 of the bits will be set, but in case of Extended mode, more than + * one bits can be set. + * + * Returns the link mode : TMDS or FRL on success, else retunes negative error + * code. + **/ +int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux *aux, u8 *frl_trained_mask) +{ + u8 buf; + int mode; + int ret; + + ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_POST_FRL_STATUS, &buf); + if (ret < 0) + return ret; + + mode = buf & DP_PCON_HDMI_LINK_MODE; + + if (frl_trained_mask && DP_PCON_HDMI_MODE_FRL == mode) + *frl_trained_mask = (buf & DP_PCON_HDMI_FRL_TRAINED_BW) >> 1; + + return mode; +} +EXPORT_SYMBOL(drm_dp_pcon_hdmi_link_mode); diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 159191c1ae75..82fa75f6cc86 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -411,6 +411,17 @@ struct drm_device; # define DP_DS_10BPC 1 # define DP_DS_12BPC 2 # define DP_DS_16BPC 3 +/* HDMI2.1 PCON FRL CONFIGURATION */ +# define DP_PCON_MAX_FRL_BW (7 << 2) +# define DP_PCON_MAX_0GBPS (0 << 2) +# define DP_PCON_MAX_9GBPS (1 << 2) +# define DP_PCON_MAX_18GBPS (2 << 2) +# define DP_PCON_MAX_24GBPS (3 << 2) +# define DP_PCON_MAX_32GBPS (4 << 2) +# define DP_PCON_MAX_40GBPS (5 << 2) +# define DP_PCON_MAX_48GBPS (6 << 2) +# define DP_PCON_SOURCE_CTL_MODE (1 << 5) + /* offset 3 for DVI */ # define DP_DS_DVI_DUAL_LINK (1 << 1) # define DP_DS_DVI_HIGH_COLOR_DEPTH (1 << 2) @@ -1053,6 +1064,61 @@ struct drm_device; #define DP_CEC_RX_MESSAGE_BUFFER 0x3010 #define DP_CEC_TX_MESSAGE_BUFFER 0x3020 #define DP_CEC_MESSAGE_BUFFER_LENGTH 0x10 +/* PROTOCOL CONVERSION HDMI SINK */ +#define DP_PCON_HDMI_SINK 0x3035 +# define DP_HDMI_SINK_LINK_BW (7 << 0) +# define DP_HDMI_SINK_BW_0GBPS 0 +# define DP_HDMI_SINK_BW_9GBPS 1 +# define DP_HDMI_SINK_BW_18GBPS 2 +# define DP_HDMI_SINK_BW_24GBPS 3 +# define DP_HDMI_SINK_BW_32GBPS 4 +# define DP_HDMI_SINK_BW_40GBPS 5 +# define DP_HDMI_SINK_BW_48GBPS 6 + +/* PCON CONFIGURE-1 FRL FOR HDMI SINK */ +#define DP_PCON_HDMI_LINK_CONFIG_1 0x305A +# define DP_PCON_ENABLE_MAX_FRL_BW (7 << 0) +# define DP_PCON_ENABLE_MAX_BW_0GBPS 0 +# define DP_PCON_ENABLE_MAX_BW_9GBPS 1 +# define DP_PCON_ENABLE_MAX_BW_18GBPS 2 +# define DP_PCON_ENABLE_MAX_BW_24GBPS 3 +# define DP_PCON_ENABLE_MAX_BW_32GBPS 4 +# define DP_PCON_ENABLE_MAX_BW_40GBPS 5 +# define DP_PCON_ENABLE_MAX_BW_48GBPS 6 +# define DP_PCON_ENABLE_SOURCE_CTL_MODE (1 << 3) +# define DP_PCON_ENABLE_CONCURRENT_LINK (1 << 4) +# define DP_PCON_ENABLE_LINK_FRL_MODE (1 << 5) +# define DP_PCON_ENABLE_HPD_READY (1 << 6) +# define DP_PCON_ENABLE_HDMI_LINK (1 << 7) + +/* PCON CONFIGURE-2 FRL FOR HDMI SINK */ +#define DP_PCON_HDMI_LINK_CONFIG_2 0x305B +# define DP_PCON_MAX_LINK_BW_MASK (0x3F << 0) +# define DP_PCON_FRL_BW_MASK_9GBPS (1 << 0) +# define DP_PCON_FRL_BW_MASK_18GBPS (1 << 1) +# define DP_PCON_FRL_BW_MASK_24GBPS (1 << 2) +# define DP_PCON_FRL_BW_MASK_32GBPS (1 << 3) +# define DP_PCON_FRL_BW_MASK_40GBPS (1 << 4) +# define DP_PCON_FRL_BW_MASK_48GBPS (1 << 5) +# define DP_PCON_FRL_LINK_TRAIN_EXTENDED (1 << 6) + +/* PCON HDMI LINK STATUS */ +#define DP_PCON_HDMI_TX_LINK_STATUS 0x303B +# define DP_PCON_HDMI_TX_LINK_ACTIVE (1 << 0) +# define DP_PCON_FRL_READY (1 << 1) + +/* PCON HDMI POST FRL STATUS */ +#define DP_PCON_HDMI_POST_FRL_STATUS 0x3036 +# define DP_PCON_HDMI_LINK_MODE (1 << 0) +# define DP_PCON_HDMI_MODE_TMDS 0 +# define DP_PCON_HDMI_MODE_FRL 1 +# define DP_PCON_HDMI_FRL_TRAINED_BW (0x3F << 1) +# define DP_PCON_FRL_TRAINED_BW_9GBPS (1 << 1) +# define DP_PCON_FRL_TRAINED_BW_18GBPS (1 << 2) +# define DP_PCON_FRL_TRAINED_BW_24GBPS (1 << 3) +# define DP_PCON_FRL_TRAINED_BW_32GBPS (1 << 4) +# define DP_PCON_FRL_TRAINED_BW_40GBPS (1 << 5) +# define DP_PCON_FRL_TRAINED_BW_48GBPS (1 << 6) #define DP_PROTOCOL_CONVERTER_CONTROL_0 0x3050 /* DP 1.3 */ # define DP_HDMI_DVI_OUTPUT_CONFIG (1 << 0) /* DP 1.3 */ @@ -1905,4 +1971,18 @@ int drm_dp_get_phy_test_pattern(struct drm_dp_aux *aux, struct drm_dp_phy_test_params *data); int drm_dp_set_phy_test_pattern(struct drm_dp_aux *aux, struct drm_dp_phy_test_params *data, u8 dp_rev); +int drm_dp_get_pcon_max_frl_bw(const u8 dpcd[DP_RECEIVER_CAP_SIZE], + const u8 port_cap[4]); +int drm_dp_get_hdmi_max_frl_bw(struct drm_dp_aux *aux); +int drm_dp_pcon_frl_prepare(struct drm_dp_aux *aux, bool enable_frl_ready_hpd); +bool drm_dp_pcon_is_frl_ready(struct drm_dp_aux *aux); +int drm_dp_pcon_frl_configure_1(struct drm_dp_aux *aux, int max_frl_gbps, + bool concurrent_mode); +int drm_dp_pcon_frl_configure_2(struct drm_dp_aux *aux, int max_frl_mask, + bool extended_train_mode); +int drm_dp_pcon_reset_frl_config(struct drm_dp_aux *aux); +int drm_dp_pcon_frl_enable(struct drm_dp_aux *aux); + +bool drm_dp_pcon_hdmi_link_active(struct drm_dp_aux *aux); +int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux *aux, u8 *frl_trained_mask); #endif /* _DRM_DP_HELPER_H_ */