From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759337AbbLBRSY (ORCPT ); Wed, 2 Dec 2015 12:18:24 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:43924 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933288AbbLBRBr (ORCPT ); Wed, 2 Dec 2015 12:01:47 -0500 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Sifan Naeem , Wolfram Sang , Kamal Mostafa Subject: [PATCH 3.19.y-ckt 131/164] i2c: img-scb: Clear line and interrupt status before starting a transfer Date: Wed, 2 Dec 2015 08:59:42 -0800 Message-Id: <1449075615-20754-132-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1449075615-20754-1-git-send-email-kamal@canonical.com> References: <1449075615-20754-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.19 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.19.8-ckt11 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Sifan Naeem commit 1ed6faedfc9741cca2d97b25ab73902ba7177093 upstream. Clear line status and all generated interrupts from the interrupt status register before starting a transfer, as we may have unserviced interrupts from previous transfers that might be handled in the context of the new transfer. Fixes: commit 27bce457d588 ("i2c: img-scb: Add Imagination Technologies I2C SCB driver") Signed-off-by: Sifan Naeem Acked-by: James Hogan Reviewed-by: James Hartley Signed-off-by: Wolfram Sang Signed-off-by: Kamal Mostafa --- drivers/i2c/busses/i2c-img-scb.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c index 515cbb4..90ffb07 100644 --- a/drivers/i2c/busses/i2c-img-scb.c +++ b/drivers/i2c/busses/i2c-img-scb.c @@ -1058,6 +1058,15 @@ static int img_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, i2c->last_msg = (i == num - 1); reinit_completion(&i2c->msg_complete); + /* + * Clear line status and all interrupts before starting a + * transfer, as we may have unserviced interrupts from + * previous transfers that might be handled in the context + * of the new transfer. + */ + img_i2c_writel(i2c, SCB_INT_CLEAR_REG, ~0); + img_i2c_writel(i2c, SCB_CLEAR_REG, ~0); + if (atomic) img_i2c_atomic_start(i2c); else if (msg->flags & I2C_M_RD) -- 1.9.1