From patchwork Wed Apr 29 15:39:00 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hai Li X-Patchwork-Id: 6296891 Return-Path: X-Original-To: patchwork-dri-devel@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 D77C59F32B for ; Wed, 29 Apr 2015 15:39:37 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 35CFF201E4 for ; Wed, 29 Apr 2015 15:39:34 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 6C73720160 for ; Wed, 29 Apr 2015 15:39:30 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A52BB6E2B7; Wed, 29 Apr 2015 08:39:29 -0700 (PDT) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from smtp.codeaurora.org (smtp.codeaurora.org [198.145.29.96]) by gabe.freedesktop.org (Postfix) with ESMTP id 853B36E2B7 for ; Wed, 29 Apr 2015 08:39:28 -0700 (PDT) Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 7DE5A141B80; Wed, 29 Apr 2015 15:39:28 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 486) id 6E69C141B8C; Wed, 29 Apr 2015 15:39:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from yyzubuntu32.qualcomm.com (rrcs-67-52-130-30.west.biz.rr.com [67.52.130.30]) (using TLSv1.1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: hali@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 31B18141B80; Wed, 29 Apr 2015 15:39:27 +0000 (UTC) From: Hai Li To: dri-devel@lists.freedesktop.org Subject: [PATCH 2/2] drm/msm/dsi: Simplify the code to get the number of read byte Date: Wed, 29 Apr 2015 11:39:00 -0400 Message-Id: <1430321940-1041-3-git-send-email-hali@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1430321940-1041-1-git-send-email-hali@codeaurora.org> References: <1430321940-1041-1-git-send-email-hali@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP During cmd rx, only new versions of H/W provide register to read back the real number of byte returned by panel. For the old versions, reading this register will not get the right number. In fact, we only need to assume the returned data is the same size as we expected, because later we will check the data type to detect error. Signed-off-by: Hai Li --- drivers/gpu/drm/msm/dsi/dsi_host.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index 473d417..72d4d5f 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -1093,7 +1093,6 @@ static int dsi_cmd_dma_rx(struct msm_dsi_host *msm_host, { u32 *lp, *temp, data; int i, j = 0, cnt; - bool ack_error = false; u32 read_cnt; u8 reg[16]; int repeated_bytes = 0; @@ -1105,15 +1104,10 @@ static int dsi_cmd_dma_rx(struct msm_dsi_host *msm_host, if (cnt > 4) cnt = 4; /* 4 x 32 bits registers only */ - /* Calculate real read data count */ - read_cnt = dsi_read(msm_host, 0x1d4) >> 16; - - ack_error = (rx_byte == 4) ? - (read_cnt == 8) : /* short pkt + 4-byte error pkt */ - (read_cnt == (pkt_size + 6 + 4)); /* long pkt+4-byte error pkt*/ - - if (ack_error) - read_cnt -= 4; /* Remove 4 byte error pkt */ + if (rx_byte == 4) + read_cnt = 4; + else + read_cnt = pkt_size + 6; /* * In case of multiple reads from the panel, after the first read, there