From a5969cabbb4660eab42b6ef0412cbbd1200cf14d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 12 Oct 2024 07:10:09 +0000
Subject: [PATCH] 修改led为gpio
---
kernel/drivers/i2c/busses/i2c-designware-master.c | 15 +++++++++++++--
1 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/kernel/drivers/i2c/busses/i2c-designware-master.c b/kernel/drivers/i2c/busses/i2c-designware-master.c
index 2871cf2..106080b 100644
--- a/kernel/drivers/i2c/busses/i2c-designware-master.c
+++ b/kernel/drivers/i2c/busses/i2c-designware-master.c
@@ -432,8 +432,19 @@
regmap_read(dev->map, DW_IC_DATA_CMD, &tmp);
/* Ensure length byte is a valid value */
- if (flags & I2C_M_RECV_LEN &&
- tmp <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
+ if (flags & I2C_M_RECV_LEN) {
+ /*
+ * if IC_EMPTYFIFO_HOLD_MASTER_EN is set, which cannot be
+ * detected from the registers, the controller can be
+ * disabled if the STOP bit is set. But it is only set
+ * after receiving block data response length in
+ * I2C_FUNC_SMBUS_BLOCK_DATA case. That needs to read
+ * another byte with STOP bit set when the block data
+ * response length is invalid to complete the transaction.
+ */
+ if (!tmp || tmp > I2C_SMBUS_BLOCK_MAX)
+ tmp = 1;
+
len = i2c_dw_recv_len(dev, tmp);
}
*buf++ = tmp;
--
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