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From: Jiada Wang <jiada_wang@mentor.com>
To: <nick@shmanahar.org>, <dmitry.torokhov@gmail.com>,
	<jikos@kernel.org>, <benjamin.tissoires@redhat.com>,
	<bsz@semihalf.com>, <rydberg@bitmath.org>
Cc: <linux-input@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<erosca@de.adit-jv.com>, <Andrew_Gabbasov@mentor.com>,
	<jiada_wang@mentor.com>
Subject: [PATCH v8 04/52] Input: atmel_mxt_ts - split large i2c transfers into blocks
Date: Thu, 19 Mar 2020 07:59:28 -0700
Message-ID: <20200319150016.61398-5-jiada_wang@mentor.com> (raw)
In-Reply-To: <20200319150016.61398-1-jiada_wang@mentor.com>

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

On some firmware variants, the size of the info block exceeds what can
be read in a single transfer.

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
(cherry picked from ndyer/linux/for-upstream commit 74c4f5277cfa403d43fafc404119dc57a08677db)
[gdavis: Forward port and fix conflicts due to v4.14.51 commit
	 960fe000b1d3 ("Input: atmel_mxt_ts - fix the firmware
	 update").]
Signed-off-by: George G. Davis <george_davis@mentor.com>
[jiada: Change mxt_read_blks() to __mxt_read_reg(), original __mxt_read_reg() to
	__mxt_read_chunk()]
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 28 +++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 3f1ebe14802f..7e6a66e3e1e0 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -40,7 +40,7 @@
 #define MXT_OBJECT_START	0x07
 #define MXT_OBJECT_SIZE		6
 #define MXT_INFO_CHECKSUM_SIZE	3
-#define MXT_MAX_BLOCK_WRITE	256
+#define MXT_MAX_BLOCK_WRITE	255
 
 /* Object types */
 #define MXT_DEBUG_DIAGNOSTIC_T37	37
@@ -624,8 +624,8 @@ static int mxt_send_bootloader_cmd(struct mxt_data *data, bool unlock)
 	return 0;
 }
 
-static int __mxt_read_reg(struct i2c_client *client,
-			       u16 reg, u16 len, void *val)
+static int __mxt_read_chunk(struct i2c_client *client,
+			    u16 reg, u16 len, void *val)
 {
 	struct i2c_msg xfer[2];
 	u8 buf[2];
@@ -659,6 +659,28 @@ static int __mxt_read_reg(struct i2c_client *client,
 	return ret;
 }
 
+static int __mxt_read_reg(struct i2c_client *client,
+			  u16 reg, u16 len, void *buf)
+{
+	u16 offset = 0;
+	int error;
+	u16 size;
+
+	while (offset < len) {
+		size = min(MXT_MAX_BLOCK_WRITE, len - offset);
+
+		error = __mxt_read_chunk(client,
+					 reg + offset,
+					 size, buf + offset);
+		if (error)
+			return error;
+
+		offset += size;
+	}
+
+	return 0;
+}
+
 static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
 			   const void *val)
 {
-- 
2.17.1


  parent reply index

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-19 14:59 [PATCH v8 00/52] atmel_mxt_ts misc Jiada Wang
2020-03-19 14:59 ` [PATCH v8 01/52] Input: introduce input_mt_report_slot_inactive Jiada Wang
2020-03-19 14:59 ` [PATCH v8 02/52] Input: atmel_mxt_ts - rework sysfs init/remove Jiada Wang
2020-03-19 14:59 ` [PATCH v8 03/52] Input: atmel_mxt_ts - only read messages in mxt_acquire_irq() when necessary Jiada Wang
2020-03-19 14:59 ` Jiada Wang [this message]
2020-03-19 14:59 ` [PATCH v8 05/52] Input: atmel_mxt_ts - output status from T48 Noise Supression Jiada Wang
2020-03-19 14:59 ` [PATCH v8 06/52] Input: atmel_mxt_ts - output status from T42 Touch Suppression Jiada Wang
2020-03-19 14:59 ` [PATCH v8 07/52] Input: atmel_mxt_ts - implement T9 vector/orientation support Jiada Wang
2020-03-19 14:59 ` [PATCH v8 08/52] Input: atmel_mxt_ts - implement T15 Key Array support Jiada Wang
2020-03-19 14:59 ` [PATCH v8 09/52] Input: atmel_mxt_ts - handle reports from T47 Stylus object Jiada Wang
2020-03-19 14:59 ` [PATCH v8 10/52] Input: atmel_mxt_ts - implement support for T107 active stylus Jiada Wang
2020-03-19 14:59 ` [PATCH v8 11/52] Input: atmel_mxt_ts - add debug for T92 gesture and T93 touch seq msgs Jiada Wang
2020-03-19 14:59 ` [PATCH v8 12/52] Input: atmel_mxt_ts - release touch state during suspend Jiada Wang
2020-03-19 14:59 ` [PATCH v8 13/52] Input: atmel_mxt_ts - add regulator control support Jiada Wang
2020-03-19 14:59 ` [PATCH v8 14/52] dt-bindings: input: atmel: add suspend mode support Jiada Wang
2020-03-19 14:59 ` [PATCH v8 15/52] Input: atmel_mxt_ts - report failures in suspend/resume Jiada Wang
2020-03-19 14:59 ` [PATCH v8 16/52] Input: atmel_mxt_ts - allow specification of firmware file name Jiada Wang
2020-03-19 14:59 ` [PATCH v8 17/52] Input: atmel_mxt_ts - handle cfg filename via pdata/sysfs Jiada Wang
2020-03-19 14:59 ` [PATCH v8 18/52] dt-bindings: input: atmel: provide name of configuration file Jiada Wang
2020-03-19 14:59 ` [PATCH v8 19/52] Input: atmel_mxt_ts - allow input name to be specified in platform data Jiada Wang
2020-03-19 14:59 ` [PATCH v8 20/52] dt-bindings: input: atmel: support to specify input name Jiada Wang
2020-03-19 14:59 ` [PATCH v8 21/52] Input: atmel_mxt_ts - add config checksum attribute to sysfs Jiada Wang
2020-03-19 14:59 ` [PATCH v8 22/52] Input: atmel_mxt_ts - refactor firmware flash to extract context into struct Jiada Wang
2020-03-19 14:59 ` [PATCH v8 23/52] Input: atmel_mxt_ts - refactor code to enter bootloader into separate func Jiada Wang
2020-03-19 14:59 ` [PATCH v8 24/52] Input: atmel_mxt_ts - combine bootloader version query with probe Jiada Wang
2020-03-19 14:59 ` [PATCH v8 25/52] Input: atmel_mxt_ts - improve bootloader state machine handling Jiada Wang
2020-03-19 14:59 ` [PATCH v8 26/52] Input: atmel_mxt_ts - rename bl_completion to chg_completion Jiada Wang
2020-03-19 14:59 ` [PATCH v8 27/52] Input: atmel_mxt_ts - make bootloader interrupt driven Jiada Wang
2020-03-19 14:59 ` [PATCH v8 28/52] Input: atmel_mxt_ts - delay enabling IRQ when not using regulators Jiada Wang
2020-03-19 14:59 ` [PATCH v8 29/52] Input: atmel_mxt_ts - implement I2C retries Jiada Wang
2020-03-19 14:59 ` [PATCH v8 30/52] Input: atmel_mxt_ts - orientation is not present in hover Jiada Wang
2020-03-19 14:59 ` [PATCH v8 31/52] Input: atmel_mxt_ts - implement debug output for messages Jiada Wang
2020-03-19 14:59 ` [PATCH v8 32/52] Input: atmel_mxt_ts - implement improved debug message interface Jiada Wang
2020-03-19 14:59 ` [PATCH v8 33/52] Input: atmel_mxt_ts - eliminate data->raw_info_block Jiada Wang
2020-03-19 14:59 ` [PATCH v8 34/52] Input: atmel_mxt_ts - Change call-points of mxt_free_* functions Jiada Wang
2020-03-19 14:59 ` [PATCH v8 35/52] Input: atmel_mxt_ts - rely on calculated_crc rather than file config_crc Jiada Wang
2020-03-19 15:00 ` [PATCH v8 36/52] input: atmel_mxt_ts: export GPIO reset line via sysfs Jiada Wang
2020-03-19 15:00 ` [PATCH v8 37/52] input: atmel_mxt_ts: Add Missing Delay for reset handling of Atmel touch panel controller in detachable displays Jiada Wang
2020-03-19 15:00 ` [PATCH v8 38/52] Input: atmel_mxt_ts: Add support for run self-test routine Jiada Wang
2020-03-19 15:00 ` [PATCH v8 39/52] Input: atmel_mxt_ts: Limit the max bytes transferred in an i2c transaction Jiada Wang
2020-03-19 15:00 ` [PATCH v8 40/52] dt-bindings: input: atmel: support to set max bytes transferred Jiada Wang
2020-03-19 15:00 ` [PATCH v8 41/52] Input: atmel_mxt_ts: return error from mxt_process_messages_until_invalid() Jiada Wang
2020-03-19 15:00 ` [PATCH v8 42/52] Input: Atmel: improve error handling in mxt_start() Jiada Wang
2020-03-19 15:00 ` [PATCH v8 43/52] Input: Atmel: improve error handling in mxt_initialize() Jiada Wang
2020-03-19 15:00 ` [PATCH v8 44/52] Input: Atmel: improve error handling in mxt_update_cfg() Jiada Wang
2020-03-19 15:00 ` [PATCH v8 45/52] Input: Atmel: Improve error handling in mxt_initialize_input_device() Jiada Wang
2020-03-19 15:00 ` [PATCH v8 46/52] Input: Atmel: handle ReportID "0x00" while processing T5 messages Jiada Wang
2020-03-19 15:00 ` [PATCH v8 47/52] Input: Atmel: use T44 object to process " Jiada Wang
2020-03-19 15:00 ` [PATCH v8 48/52] Input: atmel_mxt_ts: use gpiod_set_value_cansleep for reset pin Jiada Wang
2020-03-19 15:00 ` [PATCH v8 49/52] input: touchscreen: atmel_mxt_ts: Added sysfs entry for touchscreen status Jiada Wang
2020-03-19 15:00 ` [PATCH v8 50/52] input: atmel_mxt_ts: added sysfs interface to update atmel T38 data Jiada Wang
2020-03-19 15:00 ` [PATCH v8 51/52] Input: atmel_mxt_ts: Implement synchronization during various operation Jiada Wang
2020-03-19 15:00 ` [PATCH v8 52/52] Input: atmel_mxt_ts - Fix compilation warning Jiada Wang

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