From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1B4DC43462 for ; Sat, 8 May 2021 02:28:51 +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 82733610A2 for ; Sat, 8 May 2021 02:28:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 82733610A2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id EB9006E846; Sat, 8 May 2021 02:28:34 +0000 (UTC) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id 85D5C6E82A for ; Sat, 8 May 2021 02:28:31 +0000 (UTC) IronPort-SDR: DjerOajXXH1KQi+kLNxhuFhg1Z9leOyKVAerh1kNQlvRpjF4AAahEDDu2y1CyFP9XnYq2hrYfY d/57MTq7y2tA== X-IronPort-AV: E=McAfee;i="6200,9189,9977"; a="284317020" X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="284317020" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 19:28:30 -0700 IronPort-SDR: fMbHdK0qpUjsFtGNa8WbDTSEwR2bcCDnsvwC7x3C0asEErpNjNqAw6cmQ85aWTZbtGdGfhdVfk WCb9o8IKf9DA== X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="533910125" Received: from mdroper-desk1.fm.intel.com ([10.1.27.168]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 19:28:29 -0700 From: Matt Roper To: intel-gfx@lists.freedesktop.org Date: Fri, 7 May 2021 19:28:02 -0700 Message-Id: <20210508022820.780227-31-matthew.d.roper@intel.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20210508022820.780227-1-matthew.d.roper@intel.com> References: <20210508022820.780227-1-matthew.d.roper@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v3 30/48] drm/i915/adl_p: Tx escape clock with DSI X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Mika Kahola Today when the DSI controller is paired with the Combo-PHY it uses the high-speed (HS) Word clock for its low power (LP) transmit PPI communication to the DPHY. The interface signaling only changes state at an Escape clock frequency (i.e. its effectively running on a virtual Tx Escape clock that is controlled by counters w/in the controller), but all the interface flops are running off the HS clock. This has the following drawbacks: * It is a deviation from the PPI spec which assumes signaling is running on a physical Escape clock * The PV timings are over constrained (HS timed to 312.5MHz vs. an Escape clock of 20MHz max) This feature is proposing to change the LP Tx communication between the controller and the DPHY from a virtual Tx Escape clock to a physical clock. To do this we need to program two "M" divisors. One for the usual DSI_ESC_CLK_DIV and DPHY_ESC_CLK_DIV register and one for MIPIO_DWORD8. For DSI_ESC_CLK_DIV and DPHY_ESC_CLK_DIV registers the "M" is calculated as following Nt = ceil(f_link/160) (theoretical word clock) Nact = max[3, Nt + (Nt + 1)%2] (actual word clock) M = Nact * 8 For MIPIO_DWORD8 register, the divisor "M" is calculated as following M = (Nact - 1)/2 BSpec: 55171 Cc: Vandita Kulkarni Signed-off-by: Mika Kahola Signed-off-by: Clinton Taylor Signed-off-by: Matt Roper --- drivers/gpu/drm/i915/display/icl_dsi.c | 21 +++++++++++++++++++-- drivers/gpu/drm/i915/i915_reg.h | 6 ++++++ 2 files changed, 25 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c index ce544e20f35c..27251b97f0c3 100644 --- a/drivers/gpu/drm/i915/display/icl_dsi.c +++ b/drivers/gpu/drm/i915/display/icl_dsi.c @@ -363,10 +363,19 @@ static void gen11_dsi_program_esc_clk_div(struct intel_encoder *encoder, struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder); enum port port; int afe_clk_khz; - u32 esc_clk_div_m; + int theo_word_clk, act_word_clk; + u32 esc_clk_div_m, esc_clk_div_m_phy; afe_clk_khz = afe_clk(encoder, crtc_state); - esc_clk_div_m = DIV_ROUND_UP(afe_clk_khz, DSI_MAX_ESC_CLK); + + if (IS_ALDERLAKE_S(dev_priv) || IS_ALDERLAKE_P(dev_priv)) { + theo_word_clk = DIV_ROUND_UP(afe_clk_khz, 8 * DSI_MAX_ESC_CLK); + act_word_clk = max(3, theo_word_clk + (theo_word_clk + 1) % 2); + esc_clk_div_m = act_word_clk * 8; + esc_clk_div_m_phy = (act_word_clk - 1)/2; + } else { + esc_clk_div_m = DIV_ROUND_UP(afe_clk_khz, DSI_MAX_ESC_CLK); + } for_each_dsi_port(port, intel_dsi->ports) { intel_de_write(dev_priv, ICL_DSI_ESC_CLK_DIV(port), @@ -379,6 +388,14 @@ static void gen11_dsi_program_esc_clk_div(struct intel_encoder *encoder, esc_clk_div_m & ICL_ESC_CLK_DIV_MASK); intel_de_posting_read(dev_priv, ICL_DPHY_ESC_CLK_DIV(port)); } + + if (IS_ALDERLAKE_S(dev_priv) || IS_ALDERLAKE_P(dev_priv)) { + for_each_dsi_port(port, intel_dsi->ports) { + intel_de_write(dev_priv, ADL_MIPIO_DW(port, 8), + esc_clk_div_m_phy & TX_ESC_CLK_DIV_PHY); + intel_de_posting_read(dev_priv, ADL_MIPIO_DW(port, 8)); + } + } } static void get_dsi_io_power_domains(struct drm_i915_private *dev_priv, diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 345dc922eca5..9a52711e3920 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -11332,6 +11332,12 @@ enum skl_power_gate { #define ICL_ESC_CLK_DIV_SHIFT 0 #define DSI_MAX_ESC_CLK 20000 /* in KHz */ +#define _ADL_MIPIO_REG 0x180 +#define ADL_MIPIO_DW(port, dw) _MMIO(_ICL_COMBOPHY(port) + _ADL_MIPIO_REG + 4 * (dw)) +#define TX_ESC_CLK_DIV_PHY_SEL REGBIT(16) +#define TX_ESC_CLK_DIV_PHY_MASK REG_GENMASK(23, 16) +#define TX_ESC_CLK_DIV_PHY REG_FIELD_PREP(TX_ESC_CLK_DIV_PHY_MASK, 0x7f) + #define _DSI_CMD_FRMCTL_0 0x6b034 #define _DSI_CMD_FRMCTL_1 0x6b834 #define DSI_CMD_FRMCTL(port) _MMIO_PORT(port, \ -- 2.25.4 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx