linux-kernel - Re: [PATCH v2 1/3] i2c: tegra: Add GPCDMA support

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Date:   Sat, 10 Sep 2022 12:03:19 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Akhil R <akhilrajeev@...dia.com>, christian.koenig@....com,
        devicetree@...r.kernel.org, jonathanh@...dia.com,
        ldewangan@...dia.com, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        robh+dt@...nel.org, sumit.semwal@...aro.org,
        thierry.reding@...il.com, wsa@...nel.org
Subject: Re: [PATCH v2 1/3] i2c: tegra: Add GPCDMA support

06.09.2022 17:47, Akhil R пишет:
> Enable support for GPCDMA, which is used in I2C controllers
> in Tegra 186 and above. The chips before that used APB DMA.
> This change works under the presumption that all chips apart from
> those supporting APB DMA is using GPCDMA.
> 
> Signed-off-by: Akhil R <akhilrajeev@...dia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 031c78ac42e6..954022c04cc4 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -443,11 +443,16 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev)
>  	u32 *dma_buf;
>  	int err;
>  
> -	if (!i2c_dev->hw->has_apb_dma || i2c_dev->is_vi)
> +	if (i2c_dev->is_vi)
>  		return 0;
>  
> -	if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA)) {
> -		dev_dbg(i2c_dev->dev, "DMA support not enabled\n");
> +	if (!i2c_dev->hw->has_apb_dma) {
> +		if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA)) {
> +			dev_dbg(i2c_dev->dev, "APB DMA support not enabled\n");
> +			return 0;
> +		}
> +	} else if (!IS_ENABLED(CONFIG_TEGRA186_GPC_DMA)) {
> +		dev_dbg(i2c_dev->dev, "GPC DMA support not enabled\n");
>  		return 0;
>  	}
>  

To me the symmetrical if-else will look a bit better, but that's a too
minor nit.

if () {
	if ()
} else {
	if ()
}

Reviewed-by: Dmitry Osipenko <digetx@...il.com>