linux-kernel - Re: [PATCH] i2c: tegra: Fix i2c-tegra DMA config option processing

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Date:   Mon, 14 Aug 2023 15:38:08 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Parker Newman <pnewman@...necttech.com>
Cc:     Laxman Dewangan <ldewangan@...dia.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c: tegra: Fix i2c-tegra DMA config option processing

On Thu, Aug 03, 2023 at 05:10:02PM +0000, Parker Newman wrote:
> 
> This patch fixes the Tegra DMA config option processing in the
> i2c-tegra driver.
> 
> Tegra processors prior to Tegra186 used APB DMA for I2C requiring
> CONFIG_TEGRA20_APB_DMA=y while Tegra186 and later use GPC DMA requiring
> CONFIG_TEGRA186_GPC_DMA=y.
> 
> The check for if the processor uses APB DMA is inverted and so the wrong
> DMA config options are checked.
> 
> This means if CONFIG_TEGRA20_APB_DMA=y but CONFIG_TEGRA186_GPC_DMA=n
> with a Tegra186 or later processor the driver will incorrectly think DMA is
> enabled and attempt to request DMA channels that will never be availible,
> leaving the driver in a perpetual EPROBE_DEFER state.
> 
> Signed-off-by: Parker Newman <pnewman@...necttech.com>

Applied to for-current, thanks!


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