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

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Date:   Sun, 6 Aug 2023 14:21:49 +0000
From:   Akhil R <akhilrajeev@...dia.com>
To:     Andi Shyti <andi.shyti@...nel.org>,
        Parker Newman <pnewman@...necttech.com>
CC:     Laxman Dewangan <ldewangan@...dia.com>,
        Dmitry Osipenko <digetx@...il.com>,
        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

> 
> BTW...
> 
> On Thu, Aug 03, 2023 at 05:10:02PM +0000, Parker Newman wrote:
> >
> 
> you have a blank line here.
> 
> > 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>
> 
> As this is a fix you also need to add
> 
> Fixes: 48cb6356fae1 ("i2c: tegra: Add GPCDMA support")
> Cc: Akhil R <akhilrajeev@...dia.com>
> Cc: <stable@...r.kernel.org> # v6.1+
> 
> Cc'eing Akhil as well for his opinion on this.
The fix looks valid to me. Must have been a typo there.

Regards,
Akhil