From: Nick Dyer <nick.dyer@xxxxxxxxxxx>
If the bootloader on the touchscreen controller fails to initialise the
firmware image, it stays in bootloader mode and reports a failure. It is
possible to reflash a working firmware image from this state.
Signed-off-by: Nick Dyer <nick.dyer@xxxxxxxxxxx>
Acked-by: Benson Leung <bleung@xxxxxxxxxxxx>
Acked-by: Yufeng Shen <miletus@xxxxxxxxxxxx>
---
drivers/input/touchscreen/atmel_mxt_ts.c | 53 ++++++++++++++++++++++++++------
1 file changed, 43 insertions(+), 10 deletions(-)
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 9b0cccd..aa957d2 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -408,6 +408,30 @@ static int mxt_lookup_bootloader_address(struct mxt_data *data)
return 0;
}
+static int mxt_probe_bootloader(struct mxt_data *data)
+{
+ struct device *dev = &data->client->dev;
+ int ret;
+ u8 val;
+ bool crc_failure;
+
+ ret = mxt_lookup_bootloader_address(data);
+ if (ret)
+ return ret;
+
+ ret = mxt_bootloader_read(data, &val, 1);
+ if (ret)
+ return ret;
+
+ /* Check app crc fail mode */
+ crc_failure = (val & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;
+
+ dev_err(dev, "Detected bootloader, status:%02X%s\n",
+ val, crc_failure ? ", APP_CRC_FAIL" : "");
+
+ return 0;
+}
+
static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val)
{
struct device *dev = &data->client->dev;
@@ -467,6 +491,7 @@ recheck:
switch (state) {
case MXT_WAITING_BOOTLOAD_CMD:
case MXT_WAITING_FRAME_DATA:
+ case MXT_APP_CRC_FAIL:
val &= ~MXT_BOOT_STATUS_MASK;
break;
case MXT_FRAME_CRC_PASS:
@@ -1495,8 +1520,14 @@ static int mxt_initialize(struct mxt_data *data)
int error;
error = mxt_get_info(data);
- if (error)
- return error;
+ if (error) {
+ error = mxt_probe_bootloader(data);
+ if (error)
+ return error;
+
+ data->in_bootloader = true;
+ return 0;
+ }
/* Get object table information */
error = mxt_get_object_table(data);
@@ -1680,15 +1711,19 @@ static int mxt_load_fw(struct device *dev, const char *fn)
if (ret)
goto release_firmware;
- /* Change to the bootloader mode */
- data->in_bootloader = true;
+ if (!data->in_bootloader) {
+ /* Change to the bootloader mode */
+ data->in_bootloader = true;
- ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_BOOT_VALUE, false);
- if (ret)
- goto release_firmware;
+ ret = mxt_t6_command(data, MXT_COMMAND_RESET,
+ MXT_BOOT_VALUE, false);
+ if (ret)
+ goto release_firmware;
- msleep(MXT_RESET_TIME);
+ msleep(MXT_RESET_TIME);
+ }
+ mxt_free_object_table(data);
reinit_completion(&data->bl_completion);
ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD);
@@ -1773,8 +1808,6 @@ static ssize_t mxt_update_fw_store(struct device *dev,
} else {
dev_info(dev, "The firmware update succeeded\n");
- mxt_free_object_table(data);
-
error = mxt_initialize(data);
if (error)
return error;
--
2.0.1
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