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Message-ID: <030766c0-a6b9-401d-9e9a-fe5d11c5d381@feathertop.org>
Date: Mon, 29 Jan 2024 10:19:35 +1100
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Subject: Re: [PATCH AUTOSEL 6.1 27/27] i2c: rk3x: Adjust mask/value offset for
 i2c2 on rv1126
Content-Language: en-US
To: Sasha Levin <sashal@kernel.org>, linux-kernel@vger.kernel.org,
 stable@vger.kernel.org
Cc: Heiko Stuebner <heiko@sntech.de>, Andi Shyti <andi.shyti@kernel.org>,
 Wolfram Sang <wsa@kernel.org>, linux-arm-kernel@lists.infradead.org,
 linux-rockchip@lists.infradead.org, linux-i2c@vger.kernel.org
References: <20240128161424.203600-1-sashal@kernel.org>
 <20240128161424.203600-27-sashal@kernel.org>
From: Tim Lunn <tim@feathertop.org>
In-Reply-To: <20240128161424.203600-27-sashal@kernel.org>
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Hi Sasha,

   Support for the rv1126 SoC was only added around linux 6.2 and 6.3, 
thus doesnt make sense to pick this patch up in 6.1

Regards
   Tim

On 1/29/24 03:14, Sasha Levin wrote:
> From: Tim Lunn <tim@feathertop.org>
>
> [ Upstream commit 92a85b7c6262f19c65a1c115cf15f411ba65a57c ]
>
> Rockchip RV1126 is using old style i2c controller, the i2c2
> bus uses a non-sequential offset in the grf register for the
> mask/value bits for this bus.
>
> This patch fixes i2c2 bus on rv1126 SoCs.
>
> Signed-off-by: Tim Lunn <tim@feathertop.org>
> Acked-by: Heiko Stuebner <heiko@sntech.de>
> Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
> Signed-off-by: Wolfram Sang <wsa@kernel.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
>   drivers/i2c/busses/i2c-rk3x.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c
> index 6aa4f1f06240..c8cd5cadcf56 100644
> --- a/drivers/i2c/busses/i2c-rk3x.c
> +++ b/drivers/i2c/busses/i2c-rk3x.c
> @@ -1295,8 +1295,12 @@ static int rk3x_i2c_probe(struct platform_device *pdev)
>   			return -EINVAL;
>   		}
>   
> -		/* 27+i: write mask, 11+i: value */
> -		value = BIT(27 + bus_nr) | BIT(11 + bus_nr);
> +		/* rv1126 i2c2 uses non-sequential write mask 20, value 4 */
> +		if (i2c->soc_data == &rv1126_soc_data && bus_nr == 2)
> +			value = BIT(20) | BIT(4);
> +		else
> +			/* 27+i: write mask, 11+i: value */
> +			value = BIT(27 + bus_nr) | BIT(11 + bus_nr);
>   
>   		ret = regmap_write(grf, i2c->soc_data->grf_offset, value);
>   		if (ret != 0) {