[PATCH 08/15] Input: atmel_mxt_ts - handle APP_CRC_FAIL on startup
From: <hidden>
Date: 2014-07-03 15:10:19
Also in:
lkml
Subsystem:
atmel maxtouch driver, input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Nick Dyer, Dmitry Torokhov, Linus Torvalds
From: Nick Dyer <redacted> 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 <redacted> Acked-by: Benson Leung <bleung@chromium.org> Acked-by: Yufeng Shen <redacted> --- 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;
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2.0.1