From patchwork Thu Jul 5 13:01:49 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Chauhan, Madhav" X-Patchwork-Id: 10509015 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 005AB603D7 for ; Thu, 5 Jul 2018 13:11:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E1D6F289ED for ; Thu, 5 Jul 2018 13:11:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D379A28A53; Thu, 5 Jul 2018 13:11:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 7493F289ED for ; Thu, 5 Jul 2018 13:11:51 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CE1856EBBB; Thu, 5 Jul 2018 13:11:50 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id EB5C16EBBB for ; Thu, 5 Jul 2018 13:11:48 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Jul 2018 06:11:48 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,312,1526367600"; d="scan'208";a="70293004" Received: from madhav-desktop.iind.intel.com ([10.223.25.13]) by orsmga001.jf.intel.com with ESMTP; 05 Jul 2018 06:11:46 -0700 From: Madhav Chauhan To: intel-gfx@lists.freedesktop.org Date: Thu, 5 Jul 2018 18:31:49 +0530 Message-Id: <1530795727-28644-3-git-send-email-madhav.chauhan@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1530795727-28644-1-git-send-email-madhav.chauhan@intel.com> References: <1530795727-28644-1-git-send-email-madhav.chauhan@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v3 02/20] drm/i915/icl: Program DSI Escape clock Divider X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jani.nikula@intel.com, paulo.r.zanoni@intel.com, rodrigo.vivi@intel.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP Escape Clock is used for LP communication across the DSI Link. To achieve the constant frequency of the escape clock from the variable DPLL frequency output, a variable divider(M) is needed. This patch programs the same. v2: (Jani N) Don't end line with "(". Signed-off-by: Madhav Chauhan --- drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/gen11_dsi.c | 64 ++++++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_reg.h | 1 + 3 files changed, 66 insertions(+) create mode 100644 drivers/gpu/drm/i915/gen11_dsi.c diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 4c6adae..368ae7c 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -142,6 +142,7 @@ i915-y += dvo_ch7017.o \ intel_dp_mst.o \ intel_dp.o \ intel_dsi.o \ + gen11_dsi.o \ intel_dsi_dcs_backlight.o \ intel_dsi_pll.o \ intel_dsi_vbt.o \ diff --git a/drivers/gpu/drm/i915/gen11_dsi.c b/drivers/gpu/drm/i915/gen11_dsi.c new file mode 100644 index 0000000..a890b36 --- /dev/null +++ b/drivers/gpu/drm/i915/gen11_dsi.c @@ -0,0 +1,64 @@ +/* + * Copyright © 2018 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * Authors: + * Madhav Chauhan + * Jani Nikula + */ + +#include "intel_dsi.h" + +static void gen11_dsi_program_esc_clk_div(struct intel_encoder *encoder) +{ + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); + struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base); + enum port port; + u32 bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format); + u32 afe_clk_khz; /* 8X Clock */ + u32 esc_clk_div_m; + + afe_clk_khz = DIV_ROUND_CLOSEST(intel_dsi->pclk * bpp, + intel_dsi->lane_count); + + esc_clk_div_m = DIV_ROUND_UP(afe_clk_khz, DSI_MAX_ESC_CLK); + + for_each_dsi_port(port, intel_dsi->ports) { + I915_WRITE(ICL_DSI_ESC_CLK_DIV(port), + esc_clk_div_m & ICL_ESC_CLK_DIV_MASK); + POSTING_READ(ICL_DSI_ESC_CLK_DIV(port)); + } + + for_each_dsi_port(port, intel_dsi->ports) { + I915_WRITE(ICL_DPHY_ESC_CLK_DIV(port), + esc_clk_div_m & ICL_ESC_CLK_DIV_MASK); + POSTING_READ(ICL_DPHY_ESC_CLK_DIV(port)); + } +} + +static void __attribute__((unused)) +gen11_dsi_pre_enable(struct intel_encoder *encoder, + const struct intel_crtc_state *pipe_config, + const struct drm_connector_state *conn_state) +{ + /* step3: enable DSI PLL */ + gen11_dsi_program_esc_clk_div(encoder); +} diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index d414940..414579f 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -9536,6 +9536,7 @@ enum skl_power_gate { #define ICL_BYTE_CLK_PER_ESC_CLK_SHIFT 16 #define ICL_ESC_CLK_DIV_MASK 0x1ff #define ICL_ESC_CLK_DIV_SHIFT 0 +#define DSI_MAX_ESC_CLK 20000 /* in KHz */ /* Gen4+ Timestamp and Pipe Frame time stamp registers */ #define GEN4_TIMESTAMP _MMIO(0x2358)