From patchwork Thu Dec 1 20:29:22 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 9456859 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 3A13960515 for ; Thu, 1 Dec 2016 20:31:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2E2F828539 for ; Thu, 1 Dec 2016 20:31:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 230F92853D; Thu, 1 Dec 2016 20:31:32 +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=-4.2 required=2.0 tests=BAYES_00, 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 E1A2F28539 for ; Thu, 1 Dec 2016 20:31:31 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8F7FD6E8EB; Thu, 1 Dec 2016 20:30:04 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by gabe.freedesktop.org (Postfix) with ESMTPS id A47266E8A0; Thu, 1 Dec 2016 20:30:02 +0000 (UTC) Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2B68419CBD8; Thu, 1 Dec 2016 20:30:02 +0000 (UTC) Received: from shalem.localdomain.com (ovpn-112-28.ams2.redhat.com [10.36.112.28]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uB1KTQo3018987; Thu, 1 Dec 2016 15:30:00 -0500 From: Hans de Goede To: Daniel Vetter , Jani Nikula , =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Thu, 1 Dec 2016 21:29:22 +0100 Message-Id: <20161201202925.12220-16-hdegoede@redhat.com> In-Reply-To: <20161201202925.12220-1-hdegoede@redhat.com> References: <20161201202925.12220-1-hdegoede@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Thu, 01 Dec 2016 20:30:02 +0000 (UTC) Cc: Hans de Goede , intel-gfx , dri-devel@lists.freedesktop.org Subject: [Intel-gfx] [PATCH 15/18] drm/i915/dsi: Document always using v3 SHUTDOWN / MIPI_SEQ_DISPLAY_OFF order X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP According to the spec for v2 VBTs we should call MIPI_SEQ_DISPLAY_OFF before sending SHUTDOWN, where as for v3 VBTs we should send SHUTDOWN first. Since the v2 order has known issues, we use the v3 order everywhere, add a comment documenting this. Signed-off-by: Hans de Goede --- drivers/gpu/drm/i915/intel_dsi.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c index 9b0c9152..7761806 100644 --- a/drivers/gpu/drm/i915/intel_dsi.c +++ b/drivers/gpu/drm/i915/intel_dsi.c @@ -708,6 +708,11 @@ static void intel_dsi_pre_disable(struct intel_encoder *encoder, intel_dsi_exec_vbt_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_OFF); intel_panel_disable_backlight(intel_dsi->attached_connector); + /* + * XXX: According to the spec we should send SHUTDOWN before + * MIPI_SEQ_DISPLAY_OFF only for v3+ VBTs, but testing in the field + * has shown that we should do this for v2 VBTs too? + */ if (is_vid_mode(intel_dsi)) { /* Send Shutdown command to the panel in LP mode */ for_each_dsi_port(port, intel_dsi->ports) @@ -739,6 +744,8 @@ static void intel_dsi_post_disable(struct intel_encoder *encoder, /* * if disable packets are sent before sending shutdown packet then in * some next enable sequence send turn on packet error is observed + * XXX spec specifies SHUTDOWN before MIPI_SEQ_DISPLAY_OFF for + * v3 VBTs, but not for v2 VBTs? */ intel_dsi_exec_vbt_sequence(intel_dsi, MIPI_SEQ_DISPLAY_OFF);