linux-kernel - [PATCH 2/2] Input: atmel_mxt_ts - mXT224 DMA quirk was fixed in firmware v2.0.AA

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Message-Id: <1407420438-6289-3-git-send-email-nick.dyer@itdev.co.uk>
Date:	Thu,  7 Aug 2014 15:07:18 +0100
From:	nick.dyer@...ev.co.uk
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Yufeng Shen <miletus@...gle.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alan Bowens <Alan.Bowens@...el.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Meerwald <pmeerw@...erw.net>,
	Benson Leung <bleung@...omium.org>,
	Olof Johansson <olofj@...omium.org>,
	Sekhar Nori <nsekhar@...com>,
	Stephen Warren <swarren@...dotorg.org>,
	Nick Dyer <nick.dyer@...ev.co.uk>
Subject: [PATCH 2/2] Input: atmel_mxt_ts - mXT224 DMA quirk was fixed in firmware v2.0.AA

From: Nick Dyer <nick.dyer@...ev.co.uk>

Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index da497db..67ea728 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -1424,10 +1424,12 @@ static int mxt_get_object_table(struct mxt_data *data)
 
 		switch (object->type) {
 		case MXT_GEN_MESSAGE_T5:
-			if (data->info.family_id == 0x80) {
+			if ((data->info.family_id == 0x80)
+			    && (data->info.version < 0x20)) {
 				/*
-				 * On mXT224 read and discard unused CRC byte
-				 * otherwise DMA reads are misaligned
+				 * On mXT224 firmware versions prior to V2.0
+				 * read and discard unused CRC byte otherwise
+				 * DMA reads are misaligned
 				 */
 				data->T5_msg_size = mxt_obj_size(object);
 			} else {
-- 
1.9.1

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