Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753628Ab3F0NEE (ORCPT ); Thu, 27 Jun 2013 09:04:04 -0400 Received: from kdh-gw.itdev.co.uk ([89.21.227.133]:62414 "EHLO hermes.kdh.itdev.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753288Ab3F0Muk (ORCPT ); Thu, 27 Jun 2013 08:50:40 -0400 From: Nick Dyer To: Dmitry Torokhov Cc: Daniel Kurtz , Henrik Rydberg , Joonyoung Shim , Alan Bowens , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Meerwald , Benson Leung , Olof Johansson , Nick Dyer Subject: [PATCH 16/51] Input: atmel_mxt_ts - Implement bootloader frame retries Date: Thu, 27 Jun 2013 13:48:51 +0100 Message-Id: <1372337366-9286-17-git-send-email-nick.dyer@itdev.co.uk> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1372337366-9286-1-git-send-email-nick.dyer@itdev.co.uk> References: <1372337366-9286-1-git-send-email-nick.dyer@itdev.co.uk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2179 Lines: 75 Signed-off-by: Nick Dyer Acked-by: Benson Leung --- drivers/input/touchscreen/atmel_mxt_ts.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 1ad60b6..3172610 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -490,8 +490,12 @@ recheck: val &= ~MXT_BOOT_STATUS_MASK; break; case MXT_FRAME_CRC_PASS: - if (val == MXT_FRAME_CRC_CHECK) + if (val == MXT_FRAME_CRC_CHECK) { goto recheck; + } else if (val == MXT_FRAME_CRC_FAIL) { + dev_err(dev, "Bootloader CRC fail\n"); + return -EINVAL; + } break; default: return -EINVAL; @@ -1451,6 +1455,7 @@ static int mxt_load_fw(struct device *dev, const char *fn) const struct firmware *fw = NULL; unsigned int frame_size; unsigned int pos = 0; + unsigned int retry = 0; int ret; ret = request_firmware(&fw, fn, dev); @@ -1488,9 +1493,7 @@ static int mxt_load_fw(struct device *dev, const char *fn) frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1)); - /* We should add 2 at frame size as the the firmware data is not - * included the CRC bytes. - */ + /* Take account of CRC bytes */ frame_size += 2; /* Write one frame to device */ @@ -1499,10 +1502,20 @@ static int mxt_load_fw(struct device *dev, const char *fn) goto disable_irq; ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS); - if (ret) - goto disable_irq; + if (ret) { + retry++; - pos += frame_size; + /* Back off by 20ms per retry */ + msleep(retry * 20); + + if (retry > 20) { + dev_err(dev, "Retry count exceeded\n"); + goto disable_irq; + } + } else { + retry = 0; + pos += frame_size; + } dev_dbg(dev, "Updated %d bytes / %zd bytes\n", pos, fw->size); } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/