From patchwork Fri Jun 29 10:13:27 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shubhrajyoti Datta X-Patchwork-Id: 1131261 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id D90E3DFF34 for ; Fri, 29 Jun 2012 10:14:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754145Ab2F2KOh (ORCPT ); Fri, 29 Jun 2012 06:14:37 -0400 Received: from comal.ext.ti.com ([198.47.26.152]:48591 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754092Ab2F2KOd (ORCPT ); Fri, 29 Jun 2012 06:14:33 -0400 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id q5TADoPG027300; Fri, 29 Jun 2012 05:13:50 -0500 Received: from DBDE71.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id q5TADnvm023384; Fri, 29 Jun 2012 15:43:49 +0530 (IST) Received: from dbdp32.itg.ti.com (172.24.170.251) by DBDE71.ent.ti.com (172.24.170.149) with Microsoft SMTP Server id 14.1.323.3; Fri, 29 Jun 2012 15:43:49 +0530 Received: from ula0393217.india.ti.com (smtpvbd.itg.ti.com [172.24.170.250]) by dbdp32.itg.ti.com (8.13.8/8.13.8) with ESMTP id q5TADivo027416; Fri, 29 Jun 2012 15:43:49 +0530 From: Shubhrajyoti D To: CC: , , , , , Felipe Balbi , Shubhrajyoti D Subject: [PATCHv3 07/17] i2c: omap: improve i462 errata handling Date: Fri, 29 Jun 2012 15:43:27 +0530 Message-ID: <1340964817-8599-8-git-send-email-shubhrajyoti@ti.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1340964817-8599-1-git-send-email-shubhrajyoti@ti.com> References: <1340964817-8599-1-git-send-email-shubhrajyoti@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: Felipe Balbi Make it not depend on ISR's local variables in order to make it easier to re-factor the transmit data loop. Also since we are waiting for XUDF just before writing data lets not flag the underflow. This is anyways going to go once we write the data. Signed-off-by: Felipe Balbi Signed-off-by: Shubhrajyoti D --- drivers/i2c/busses/i2c-omap.c | 43 ++++++++++++++++++++++++++++------------ 1 files changed, 30 insertions(+), 13 deletions(-) diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 45bd731..870452d 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -744,27 +744,30 @@ omap_i2c_omap1_isr(int this_irq, void *dev_id) * data to DATA_REG. Otherwise some data bytes can be lost while transferring * them from the memory to the I2C interface. */ -static int errata_omap3_i462(struct omap_i2c_dev *dev, u16 *stat, int *err) +static int errata_omap3_i462(struct omap_i2c_dev *dev) { unsigned long timeout = 10000; + u16 stat; - while (--timeout && !(*stat & OMAP_I2C_STAT_XUDF)) { - if (*stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) { + do { + stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); + if (stat & OMAP_I2C_STAT_XUDF) + break; + + if (stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) { omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR)); - return -ETIMEDOUT; + return -EIO; } cpu_relax(); - *stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); - } + } while (--timeout); if (!timeout) { dev_err(dev->dev, "timeout waiting on XUDF bit\n"); return 0; } - *err |= OMAP_I2C_STAT_XUDF; return 0; } @@ -926,9 +929,16 @@ complete: } } - if ((dev->errata & I2C_OMAP_ERRATA_I462) && - errata_omap3_i462(dev, &stat, &err)) - goto complete; + if (dev->errata & I2C_OMAP_ERRATA_I462) { + int ret; + + ret = errata_omap3_i462(dev); + stat = omap_i2c_read_reg(dev, + OMAP_I2C_STAT_REG); + + if (ret < 0) + goto complete; + } omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); } @@ -966,9 +976,16 @@ complete: } } - if ((dev->errata & I2C_OMAP_ERRATA_I462) && - errata_omap3_i462(dev, &stat, &err)) - goto complete; + if (dev->errata & I2C_OMAP_ERRATA_I462) { + int ret; + + ret = errata_omap3_i462(dev); + stat = omap_i2c_read_reg(dev, + OMAP_I2C_STAT_REG); + + if (ret < 0) + goto complete; + } omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); }