From patchwork Thu Jul 5 13:49:41 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chauhan, Madhav" X-Patchwork-Id: 10509365 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 CFA8E603D7 for ; Thu, 5 Jul 2018 13:59:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BEEF129082 for ; Thu, 5 Jul 2018 13:59:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B22E129088; Thu, 5 Jul 2018 13:59:58 +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 673DB29082 for ; Thu, 5 Jul 2018 13:59:58 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 95B016EDBC; Thu, 5 Jul 2018 13:59:48 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id C3CA36EDBC for ; Thu, 5 Jul 2018 13:59:46 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Jul 2018 06:59:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,312,1526367600"; d="scan'208";a="242852742" Received: from madhav-desktop.iind.intel.com ([10.223.25.13]) by fmsmga005.fm.intel.com with ESMTP; 05 Jul 2018 06:59:44 -0700 From: Madhav Chauhan To: intel-gfx@lists.freedesktop.org Date: Thu, 5 Jul 2018 19:19:41 +0530 Message-Id: <1530798591-2077-11-git-send-email-madhav.chauhan@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1530798591-2077-1-git-send-email-madhav.chauhan@intel.com> References: <1530798591-2077-1-git-send-email-madhav.chauhan@intel.com> Subject: [Intel-gfx] [PATCH v4 10/20] drm/i915/icl: Enable DDI Buffer 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 MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP This patch enables DDI buffer by writing to DDI_BUF_CTL register and wait for DDI status to be *not idle* for a port. v2: Rebase Signed-off-by: Madhav Chauhan --- drivers/gpu/drm/i915/icl_dsi.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c index 45420f2..0f481af 100644 --- a/drivers/gpu/drm/i915/icl_dsi.c +++ b/drivers/gpu/drm/i915/icl_dsi.c @@ -251,6 +251,25 @@ static void gen11_dsi_voltage_swing_program_seq(struct intel_encoder *encoder) } } +static void gen11_dsi_enable_ddi_buffer(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); + u32 tmp; + enum port port; + + for_each_dsi_port(port, intel_dsi->ports) { + tmp = I915_READ(DDI_BUF_CTL(port)); + tmp |= DDI_BUF_CTL_ENABLE; + I915_WRITE(DDI_BUF_CTL(port), tmp); + + if (wait_for_us(!(I915_READ(DDI_BUF_CTL(port)) & + DDI_BUF_IS_IDLE), + 500)) + DRM_ERROR("DDI port:%c buffer idle\n", port_name(port)); + } +} + static void gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder) { /* step 4a: power up all lanes of the DDI used by DSI */ @@ -261,6 +280,9 @@ static void gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder) /* step 4c: configure voltage swing and skew */ gen11_dsi_voltage_swing_program_seq(encoder); + + /* step 4d: enable DDI buffer */ + gen11_dsi_enable_ddi_buffer(encoder); } static void __attribute__((unused))