add ax88772C AX88772C_eeprom_tools

hc

2024-05-10 61598093bbdd283a7edc367d900f223070ead8d2

 kernel/drivers/i2c/busses/i2c-designware-master.c
..
..
@@ -432,8 +432,19 @@
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 			regmap_read(dev->map, DW_IC_DATA_CMD, &tmp);
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 			/* Ensure length byte is a valid value */
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-			if (flags & I2C_M_RECV_LEN &&
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-			    tmp <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
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+			if (flags & I2C_M_RECV_LEN) {
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+				/*
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+				 * if IC_EMPTYFIFO_HOLD_MASTER_EN is set, which cannot be
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+				 * detected from the registers, the controller can be
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+				 * disabled if the STOP bit is set. But it is only set
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+				 * after receiving block data response length in
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+				 * I2C_FUNC_SMBUS_BLOCK_DATA case. That needs to read
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+				 * another byte with STOP bit set when the block data
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+				 * response length is invalid to complete the transaction.
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+				 */
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+				if (!tmp || tmp > I2C_SMBUS_BLOCK_MAX)
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+					tmp = 1;
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+
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 				len = i2c_dw_recv_len(dev, tmp);
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 			}
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 			*buf++ = tmp;