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From: Mark Brown <broonie@kernel.org>
To: Lucas Tanure <tanureal@opensource.cirrus.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Sanjay R Mehta <sanju.mehta@amd.com>,
	Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@amd.com>,
	linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
	patches@opensource.cirrus.com
Subject: Re: [PATCH 7/9] spi: amd: Check for idle bus before execute opcode
Date: Tue, 24 Aug 2021 17:49:49 +0100	[thread overview]
Message-ID: <20210824164949.GJ4393@sirena.org.uk> (raw)
In-Reply-To: <20210824104041.708945-8-tanureal@opensource.cirrus.com>

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On Tue, Aug 24, 2021 at 11:40:39AM +0100, Lucas Tanure wrote:
> Check if the bus is not in use before starting the transfer
> Also wait after so the READ bytes in the FIFO are ready to
> be copied

This means that we will wait for read to be ready even for write only
operations, as opposed to potentially just absorbing the delay while the
CPU does other stuff.  If we need to wait prior to reading we should do
that in the relevant code.

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  reply	other threads:[~2021-08-24 16:50 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 10:40 [PATCH 0/9] Improve support for AMD SPI controllers Lucas Tanure
2021-08-24 10:40 ` [PATCH 1/9] regmap: spi: Set regmap max raw r/w from max_transfer_size Lucas Tanure
2021-08-24 16:42   ` Mark Brown
2021-08-24 10:40 ` [PATCH 2/9] spi: core: Add flag for controllers that can't hold cs between transfers Lucas Tanure
2021-08-24 16:38   ` Mark Brown
2021-08-24 10:40 ` [PATCH 3/9] regmap: spi: SPI_CONTROLLER_CS_PER_TRANSFER affects max read/write Lucas Tanure
2021-08-24 16:37   ` Mark Brown
2021-08-25 17:13     ` Lucas tanure
2021-08-25 17:21       ` Mark Brown
2021-08-24 10:40 ` [PATCH 4/9] spi: amd: Refactor code to use less spi_master_get_devdata Lucas Tanure
2021-08-24 10:40 ` [PATCH 5/9] spi: amd: Refactor amd_spi_busy_wait to use readl_poll_timeout Lucas Tanure
2021-08-24 16:46   ` Mark Brown
2021-08-24 10:40 ` [PATCH 6/9] spi: amd: Remove uneeded variable Lucas Tanure
2021-08-24 10:40 ` [PATCH 7/9] spi: amd: Check for idle bus before execute opcode Lucas Tanure
2021-08-24 16:49   ` Mark Brown [this message]
2021-08-24 10:40 ` [PATCH 8/9] spi: amd: Refactor to overcome 70 bytes per CS limitation Lucas Tanure
2021-08-24 17:16   ` Mark Brown
2021-08-24 17:18     ` Mark Brown
2021-08-24 10:40 ` [PATCH 9/9] spi: amd: Add support for latest platform Lucas Tanure
2021-08-24 15:44   ` kernel test robot
2021-08-24 17:19   ` Mark Brown

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