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To:     Su Yanjun <suyanjun218@gmail.com>,
        manivannan.sadhasivam@linaro.org, thomas.kopp@microchip.com,
        wg@grandegger.com, davem@davemloft.net, kuba@kernel.org,
        lgirdwood@gmail.com, broonie@kernel.org
Cc:     linux-can@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20210122030214.166334-1-suyanjun218@gmail.com>
From:   Marc Kleine-Budde <mkl@pengutronix.de>
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Subject: Re: [PATCH v1] can: mcp251xfd: use regmap_bulk_write for
 compatibility
Message-ID: <7007275e-a271-8160-729b-67e4d579dfe2@pengutronix.de>
Date:   Fri, 22 Jan 2021 08:26:30 +0100
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 Thunderbird/68.12.0
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In-Reply-To: <20210122030214.166334-1-suyanjun218@gmail.com>
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From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Su Yanjun <suyanjun218@gmail.com>, manivannan.sadhasivam@linaro.org,
 thomas.kopp@microchip.com, wg@grandegger.com, davem@davemloft.net,
 kuba@kernel.org, lgirdwood@gmail.com, broonie@kernel.org
Cc: linux-can@vger.kernel.org, netdev@vger.kernel.org,
 linux-kernel@vger.kernel.org
Message-ID: <7007275e-a271-8160-729b-67e4d579dfe2@pengutronix.de>
Subject: Re: [PATCH v1] can: mcp251xfd: use regmap_bulk_write for
 compatibility
References: <20210122030214.166334-1-suyanjun218@gmail.com>
In-Reply-To: <20210122030214.166334-1-suyanjun218@gmail.com>

--xOnKsZEu3EoQCXgzv2UK6pcoBQzUNpUgy
Content-Type: text/plain; charset=utf-8
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On 1/22/21 4:02 AM, Su Yanjun wrote:
> Recently i use mcp2518fd on 4.x kernel which multiple write is not
> backported, regmap_raw_write will cause old kernel crash because the
> tx buffer in driver is smaller then 2K. Use regmap_bulk_write instead
> for compatibility.

Hmmm, this patch will never be backported to any 4.x kernel, as the drive=
r is
not available on these kernels. You have to carry patches for these kerne=
ls
anyway, so I think I'll not take that patch. Sorry. Drop me a note if you=
 are
interested in updating your kernel to a recent v5.11 kernel.

regards,
Marc

--=20
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |


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