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From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com>
Cc: Billy Tsai <billy_tsai@aspeedtech.com>,
	alexandre.belloni@bootlin.com, pgaj@cadence.com,
	miquel.raynal@bootlin.com, conor.culhane@silvaco.com,
	aniketmaurya@google.com, Shyam-sundar.S-k@amd.com,
	jarkko.nikula@linux.intel.com, xiaopei01@kylinos.cn,
	Guruvendra.Punugupati@amd.com, linux-i3c@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 1/2] i3c: Remove the const qualifier from i2c_msg pointer in i2c_xfers API
Date: Wed, 22 Jan 2025 08:21:47 +0100	[thread overview]
Message-ID: <Z5Cci6ixvu5ePdlR@ninjato> (raw)
In-Reply-To: <b91a21ed-c57f-4b71-8232-a3cd7124a549@quicinc.com>


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> what we need is only i2c_xfers->buf to be DMA-safe, not the *i2c_xfers.
> Right ?

Yes.

> Also I guess same change is required for all the vendor drivers. But Not
> sure if it's feasible with this patch ?

I also wondered if the I3C core should maybe provide this, but then I
saw that currently only the mipi-hci driver uses DMA and concluded that
per-driver is better. At least for now.


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WARNING: multiple messages have this Message-ID (diff)
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com>
Cc: Billy Tsai <billy_tsai@aspeedtech.com>,
	alexandre.belloni@bootlin.com, pgaj@cadence.com,
	miquel.raynal@bootlin.com, conor.culhane@silvaco.com,
	aniketmaurya@google.com, Shyam-sundar.S-k@amd.com,
	jarkko.nikula@linux.intel.com, xiaopei01@kylinos.cn,
	Guruvendra.Punugupati@amd.com, linux-i3c@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 1/2] i3c: Remove the const qualifier from i2c_msg pointer in i2c_xfers API
Date: Wed, 22 Jan 2025 08:21:47 +0100	[thread overview]
Message-ID: <Z5Cci6ixvu5ePdlR@ninjato> (raw)
In-Reply-To: <b91a21ed-c57f-4b71-8232-a3cd7124a549@quicinc.com>

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> what we need is only i2c_xfers->buf to be DMA-safe, not the *i2c_xfers.
> Right ?

Yes.

> Also I guess same change is required for all the vendor drivers. But Not
> sure if it's feasible with this patch ?

I also wondered if the I3C core should maybe provide this, but then I
saw that currently only the mipi-hci driver uses DMA and concluded that
per-driver is better. At least for now.


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  reply	other threads:[~2025-01-29 20:34 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-21 11:07 [PATCH v1 1/2] i3c: Remove the const qualifier from i2c_msg pointer in i2c_xfers API Billy Tsai
2025-01-21 11:07 ` Billy Tsai
2025-01-21 11:07 ` [PATCH v1 2/2] i3c: mipi-i3c-hci: Use DMA-safe buffer for I2C transfers Billy Tsai
2025-01-21 11:07   ` Billy Tsai
2025-01-21 22:19   ` Wolfram Sang
2025-01-21 22:19     ` Wolfram Sang
2025-01-23 10:23     ` Billy Tsai
2025-01-23 10:23       ` Billy Tsai
2025-01-22  7:11   ` Mukesh Kumar Savaliya
2025-01-22  7:11     ` Mukesh Kumar Savaliya
2025-01-22  8:28   ` Jarkko Nikula
2025-01-22  8:28     ` Jarkko Nikula
2025-01-21 22:18 ` [PATCH v1 1/2] i3c: Remove the const qualifier from i2c_msg pointer in i2c_xfers API Wolfram Sang
2025-01-21 22:18   ` Wolfram Sang
2025-01-22  7:11 ` Mukesh Kumar Savaliya
2025-01-22  7:11   ` Mukesh Kumar Savaliya
2025-01-22  7:21   ` Wolfram Sang [this message]
2025-01-22  7:21     ` Wolfram Sang
2025-01-22  8:42 ` Thomas Weißschuh
2025-01-22  8:42   ` Thomas Weißschuh
2025-02-04 15:15 ` Mukesh Kumar Savaliya
2025-02-04 15:15   ` Mukesh Kumar Savaliya

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