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[v2,3/4] i2c: designware: Allow SMBus block reads up to 255 bytes in length

Message ID 20200917052256.5770-4-sultan@kerneltoast.com
State New
Headers show
Series i2c-hid: Save power by reducing i2c xfers with block reads | expand

Commit Message

Sultan Alsawaf (unemployed) Sept. 17, 2020, 5:22 a.m. UTC 
From: Sultan Alsawaf <sultan@kerneltoast.com>

According to the SMBus 3.0 protocol specification, block transfer limits
were increased from 32 bytes to 255 bytes. Remove the obsolete 32-byte
limitation.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
---
 drivers/i2c/busses/i2c-designware-master.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index 22f28516bca7..5bd64bd17d94 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -433,7 +433,7 @@  i2c_dw_read(struct dw_i2c_dev *dev)
 			regmap_read(dev->map, DW_IC_DATA_CMD, &tmp);
 			if (flags & I2C_M_RECV_LEN) {
 				/* Ensure length byte is a valid value */
-				if (tmp <= I2C_SMBUS_BLOCK_MAX && tmp > 0)
+				if (tmp > 0)
 					len = i2c_dw_recv_len(dev, tmp);
 				else
 					len = i2c_dw_recv_len(dev, len);