From patchwork Fri Jan 8 21:56:48 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 7990591 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id ECAC1BEEE5 for ; Fri, 8 Jan 2016 21:57:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 09A0A201ED for ; Fri, 8 Jan 2016 21:57:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 21431201C8 for ; Fri, 8 Jan 2016 21:57:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756141AbcAHV5F (ORCPT ); Fri, 8 Jan 2016 16:57:05 -0500 Received: from sauhun.de ([89.238.76.85]:48847 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755494AbcAHV5D (ORCPT ); Fri, 8 Jan 2016 16:57:03 -0500 Received: from p4fe25271.dip0.t-ipconnect.de ([79.226.82.113]:51519 helo=localhost) by pokefinder.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1aHf1o-0004mK-T8; Fri, 08 Jan 2016 22:57:01 +0100 From: Wolfram Sang To: dri-devel@lists.freedesktop.org, Laurent Pinchart Cc: Wolfram Sang , linux-sh@vger.kernel.org, Magnus Damm , Daniel Vetter , Lars-Peter Clausen , Kuninori Morimoto , David Airlie , Archit Taneja Subject: [PATCH v2 1/3] drm: adv7511: really enable interrupts for EDID detection Date: Fri, 8 Jan 2016 22:56:48 +0100 Message-Id: <1452290210-20629-2-git-send-email-wsa@the-dreams.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1452290210-20629-1-git-send-email-wsa@the-dreams.de> References: <1452290210-20629-1-git-send-email-wsa@the-dreams.de> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Wolfram Sang The interrupts for EDID_READY or DDC_ERROR were never enabled in this driver, so reading EDID always timed out when chip was powered down and interrupts were used. Fix this and also remove clearing the interrupt flags, they are cleared in POWER_DOWN mode anyhow (unlike the interrupt enable flags) according to docs and my tests. Signed-off-by: Wolfram Sang Tested-by: Archit Taneja --- drivers/gpu/drm/i2c/adv7511.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/i2c/adv7511.c b/drivers/gpu/drm/i2c/adv7511.c index 533d1e3d4a999f..db7435a4517fb4 100644 --- a/drivers/gpu/drm/i2c/adv7511.c +++ b/drivers/gpu/drm/i2c/adv7511.c @@ -362,12 +362,19 @@ static void adv7511_power_on(struct adv7511 *adv7511) { adv7511->current_edid_segment = -1; - regmap_write(adv7511->regmap, ADV7511_REG_INT(0), - ADV7511_INT0_EDID_READY); - regmap_write(adv7511->regmap, ADV7511_REG_INT(1), - ADV7511_INT1_DDC_ERROR); regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER, ADV7511_POWER_POWER_DOWN, 0); + if (adv7511->i2c_main->irq) { + /* + * Documentation says the INT_ENABLE registers are reset in + * POWER_DOWN mode. My 7511w preserved the bits, however. + * Still, let's be safe and stick to the documentation. + */ + regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(0), + ADV7511_INT0_EDID_READY); + regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(1), + ADV7511_INT1_DDC_ERROR); + } /* * Per spec it is allowed to pulse the HDP signal to indicate that the @@ -567,12 +574,14 @@ static int adv7511_get_modes(struct drm_encoder *encoder, /* Reading the EDID only works if the device is powered */ if (!adv7511->powered) { - regmap_write(adv7511->regmap, ADV7511_REG_INT(0), - ADV7511_INT0_EDID_READY); - regmap_write(adv7511->regmap, ADV7511_REG_INT(1), - ADV7511_INT1_DDC_ERROR); regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER, ADV7511_POWER_POWER_DOWN, 0); + if (adv7511->i2c_main->irq) { + regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(0), + ADV7511_INT0_EDID_READY); + regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(1), + ADV7511_INT1_DDC_ERROR); + } adv7511->current_edid_segment = -1; }