linux-kernel - Re: [PATCH 3/4] i2c: rtl9300: Add missing count byte for SMBus Block Write

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Message-ID: <6287928.DvuYhMxLoT@sven-desktop>
Date: Sat, 02 Aug 2025 12:50:01 +0200
From: Sven Eckelmann <sven@...fation.org>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>,
 Andi Shyti <andi.shyti@...nel.org>
Cc: linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
 Jonas Jelonek <jelonek.jonas@...il.com>,
 Harshal Gohel <hg@...onwunderlich.de>,
 Simon Wunderlich <sw@...onwunderlich.de>, stable@...r.kernel.org
Subject:
 Re: [PATCH 3/4] i2c: rtl9300: Add missing count byte for SMBus Block Write

On Saturday, 2 August 2025 12:32:02 CEST Sven Eckelmann wrote:
[...]
> diff --git a/drivers/i2c/busses/i2c-rtl9300.c b/drivers/i2c/busses/i2c-rtl9300.c
> index a10e5e6e00075fabb8906d56f09f5b9141fbc06e..ed82e6c21aaf46000a263740123ffba833578cc2 100644
> --- a/drivers/i2c/busses/i2c-rtl9300.c
> +++ b/drivers/i2c/busses/i2c-rtl9300.c
> @@ -288,7 +288,7 @@ static int rtl9300_i2c_smbus_xfer(struct i2c_adapter *adap, u16 addr, unsigned s
>  		if (ret)
>  			goto out_unlock;
>  		if (read_write == I2C_SMBUS_WRITE) {
> -			ret = rtl9300_i2c_write(i2c, &data->block[1], data->block[0]);
> +			ret = rtl9300_i2c_write(i2c, &data->block[0], data->block[0] + 1);
>  			if (ret)
>  				goto out_unlock;
>  		}
> 
> 

Yes, there is as always this "2 seconds" after the send "wtf. were did the 
line go" situation:

diff --git a/drivers/i2c/busses/i2c-rtl9300.c b/drivers/i2c/busses/i2c-rtl9300.c
index a10e5e6e00075fabb8906d56f09f5b9141fbc06e..4d109ebd02f0cad86f50e4e148966b3fa68b0196 100644
--- a/drivers/i2c/busses/i2c-rtl9300.c
+++ b/drivers/i2c/busses/i2c-rtl9300.c
@@ -284,11 +284,11 @@ static int rtl9300_i2c_smbus_xfer(struct i2c_adapter *adap, u16 addr, unsigned s
 		ret = rtl9300_i2c_reg_addr_set(i2c, command, 1);
 		if (ret)
 			goto out_unlock;
-		ret = rtl9300_i2c_config_xfer(i2c, chan, addr, data->block[0]);
+		ret = rtl9300_i2c_config_xfer(i2c, chan, addr, data->block[0] + 1);
 		if (ret)
 			goto out_unlock;
 		if (read_write == I2C_SMBUS_WRITE) {
-			ret = rtl9300_i2c_write(i2c, &data->block[1], data->block[0]);
+			ret = rtl9300_i2c_write(i2c, &data->block[0], data->block[0] + 1);
 			if (ret)
 				goto out_unlock;
 		}

v2 will be send tomorrow. Sorry about the noise.

Kind regards,
	Sven
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