linux-kernel - Re: [PATCH 6/7] i2c: tegra: DMA support for t186 and t194

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Message-ID: <18e4e5df-3d8f-3e52-b9b2-ff0558d6196c@gmail.com>
Date:   Thu, 23 Jul 2020 16:38:28 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Krishna Yarlagadda <kyarlagadda@...dia.com>,
        linux-i2c@...r.kernel.org, thierry.reding@...il.com
Cc:     jonathanh@...dia.com, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, ldewangan@...dia.com,
        smohammed@...dia.com, rgumasta@...dia.com
Subject: Re: [PATCH 6/7] i2c: tegra: DMA support for t186 and t194

23.07.2020 15:18, Krishna Yarlagadda пишет:
> Enable GPC DMA support for Tegra186 and Tegra194
> 
> Signed-off-by: Rajesh Gumasta <rgumasta@...dia.com>
> Signed-off-by: Krishna Yarlagadda <kyarlagadda@...dia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 25 ++++++++++++++++++++-----
>  1 file changed, 20 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 8ab968e..77198fc 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -236,6 +236,7 @@ struct tegra_i2c_hw_feature {
>  	u32 setup_hold_time_hs_mode;
>  	bool has_interface_timing_reg;
>  	bool has_slcg_support;
> +	bool has_gpc_dma;
>  };
>  
>  /**
> @@ -432,11 +433,18 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev)
>  	dma_addr_t dma_phys;
>  	int err;
>  
> -	if (!i2c_dev->hw->has_apb_dma)
> -		return 0;
> -
> -	if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA)) {
> -		dev_dbg(i2c_dev->dev, "Support for APB DMA not enabled!\n");
> +	if (i2c_dev->hw->has_gpc_dma) {
> +		if (!IS_ENABLED(CONFIG_TEGRA_GPC_DMA)) {

Single line, please.

> +			dev_dbg(i2c_dev->dev, "Support for GPC DMA not enabled!\n");
> +			return 0;
> +		}
> +	} else if (i2c_dev->hw->has_apb_dma) {
> +		if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA)) {

Here too.

> +			dev_dbg(i2c_dev->dev, "Support for APB DMA not enabled!\n");
> +			return 0;
> +		}
> +	} else {
> +		dev_dbg(i2c_dev->dev, "DMA is not enabled!\n");

Also, please drop all the exclamation marks.