From patchwork Tue Mar 3 20:56:02 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ondrej Zary X-Patchwork-Id: 5925871 Return-Path: X-Original-To: patchwork-linux-fbdev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 3DEA39F36A for ; Tue, 3 Mar 2015 20:57:00 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 621E020437 for ; Tue, 3 Mar 2015 20:56:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B3B1E2038E for ; Tue, 3 Mar 2015 20:56:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757393AbbCCU4R (ORCPT ); Tue, 3 Mar 2015 15:56:17 -0500 Received: from ns.gsystem.sk ([62.176.172.50]:56126 "EHLO gsystem.sk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756644AbbCCU4Q (ORCPT ); Tue, 3 Mar 2015 15:56:16 -0500 Received: from stip-static-68.213-81-217.telecom.sk ([213.81.217.68] helo=gsql.ggedos.sk) by gsystem.sk with esmtpsa (TLS1.1:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1YStrR-00037T-Ds; Tue, 03 Mar 2015 21:56:13 +0100 From: Ondrej Zary To: Krzysztof Helt Cc: linux-fbdev@vger.kernel.org, Kernel development list Subject: [PATCH 3/4] [resend] fb_ddc: Allow I2C adapters without SCL read capability Date: Tue, 3 Mar 2015 21:56:02 +0100 Message-Id: <1425416163-10700-3-git-send-email-linux@rainbow-software.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1425416163-10700-1-git-send-email-linux@rainbow-software.org> References: <1425416163-10700-1-git-send-email-linux@rainbow-software.org> Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_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 i2c-algo-bit allows I2C adapters without SCL read capability to work but fb_ddc_read fails to work on them. Fix fb_ddc_read to work with I2C adapters not capable of reading SCL. Signed-off-by: Ondrej Zary Acked-by: Krzysztof Helt --- drivers/video/fbdev/core/fb_ddc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/video/fbdev/core/fb_ddc.c b/drivers/video/fbdev/core/fb_ddc.c index 94322cc..22c694a 100644 --- a/drivers/video/fbdev/core/fb_ddc.c +++ b/drivers/video/fbdev/core/fb_ddc.c @@ -69,10 +69,11 @@ unsigned char *fb_ddc_read(struct i2c_adapter *adapter) algo_data->setscl(algo_data->data, 1); for (j = 0; j < 5; j++) { msleep(10); - if (algo_data->getscl(algo_data->data)) + if (algo_data->getscl && + algo_data->getscl(algo_data->data)) break; } - if (j == 5) + if (algo_data->getscl && j == 5) continue; algo_data->setsda(algo_data->data, 0); @@ -91,7 +92,8 @@ unsigned char *fb_ddc_read(struct i2c_adapter *adapter) algo_data->setscl(algo_data->data, 1); for (j = 0; j < 10; j++) { msleep(10); - if (algo_data->getscl(algo_data->data)) + if (algo_data->getscl && + algo_data->getscl(algo_data->data)) break; }