linux-kernel - Re: [PATCH V4 1/2] i2c: tegra: remove master fifo support on tegra186

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Message-ID: <20190219171137.GC14351@ulmo>
Date:   Tue, 19 Feb 2019 18:11:37 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>
Cc:     jonathanh@...dia.com, talho@...dia.com, wsa@...-dreams.de,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org
Subject: Re: [PATCH V4 1/2] i2c: tegra: remove master fifo support on tegra186

On Mon, Feb 18, 2019 at 08:50:24PM -0800, Sowjanya Komatineni wrote:
> Tegra186 does not have master fifo control register and instead
> uses fifo control register like prior tegra chipset.
> 
> This patch fixes this and prevents crashing during boot when
> accessing fifo control registers.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Nit: fifo -> FIFO, tegra -> Tegra, but other than that:

Acked-by: Thierry Reding <treding@...dia.com>

A quick note on why I'm pointing out these capitalization issues so
pedantically: specifically in the "tegra" case, it's difficult to grep
for it because it matches things like "integration", which is a
surprisingly common word in the kernel. Spelling it "Tegra" consistently
make it easier to grep for Tegra related bits specifically.

Thierry

> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index a4cd79c9f7a7..e6851904acc1 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -1436,7 +1436,7 @@ static const struct tegra_i2c_hw_feature tegra186_i2c_hw = {
>  	.has_config_load_reg = true,
>  	.has_multi_master_mode = true,
>  	.has_slcg_override_reg = true,
> -	.has_mst_fifo = true,
> +	.has_mst_fifo = false,
>  	.quirks = &tegra_i2c_quirks,
>  	.supports_bus_clear = true,
>  	.has_apb_dma = false,
> -- 
> 2.7.4
> 

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