From: David Jander <david@protonic.nl>
To: Thomas Kopp <thomas.kopp@microchip.com>
Cc: <andrew@lunn.ch>, <broonie@kernel.org>,
<linux-spi@vger.kernel.org>, <mkl@pengutronix.de>
Subject: Re: [PATCH v3 00/11] Optimize spi_sync path
Date: Mon, 18 Jul 2022 08:02:01 +0200 [thread overview]
Message-ID: <20220718080201.5799c036@erd992> (raw)
In-Reply-To: <20220715141342.12330-1-thomas.kopp@microchip.com>
Hi Thomas,
On Fri, 15 Jul 2022 16:13:42 +0200
Thomas Kopp <thomas.kopp@microchip.com> wrote:
> Hi David,
>
> some numbers after testing your patch on a RPI 5.15.y vs 5.19rc6 and the
> mcp2518fd:
>
> Two Backtoback SPI transfers with 9 byte each went from 78us to 36us! All
> metrics improved (cs to first clock cyle, last clock cycle to cs, and delay
> between two transfers). That's a great help for the mcp driver (or any
> similar SPI device).
>
> Thanks for your work on this!
Thanks a lot for testing and reporting! It is very encouraging to hear first
reports of people confirming the gains I intended to accomplish.
Best regards,
--
David Jander
Protonic Holland.
prev parent reply other threads:[~2022-07-18 6:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-21 6:12 [PATCH v3 00/11] Optimize spi_sync path David Jander
2022-06-21 6:12 ` [PATCH v3 01/11] spi: Move ctlr->cur_msg_prepared to struct spi_message David Jander
2022-06-21 6:12 ` [PATCH v3 02/11] spi: Don't use the message queue if possible in spi_sync David Jander
2022-06-21 6:12 ` [PATCH v3 03/11] spi: Lock controller idling transition inside the io_mutex David Jander
2022-06-21 13:36 ` Andy Shevchenko
2022-06-29 13:08 ` David Jander
2022-06-21 6:12 ` [PATCH v3 04/11] spi: __spi_pump_messages: Consolidate spin_unlocks to goto target David Jander
2022-06-21 6:12 ` [PATCH v3 05/11] spi: Remove check for controller idling in spi sync path David Jander
2022-06-21 6:12 ` [PATCH v3 06/11] spi: Remove check for idling in __spi_pump_messages() David Jander
2022-06-21 6:12 ` [PATCH v3 07/11] spi: Remove the now unused ctlr->idling flag David Jander
2022-06-21 6:12 ` [PATCH v3 08/11] spi: Remove unneeded READ_ONCE for ctlr->busy flag David Jander
2022-06-21 6:12 ` [PATCH v3 09/11] spi: Set ctlr->cur_msg also in the sync transfer case David Jander
2022-06-21 6:12 ` [PATCH v3 10/11] spi: Ensure the io_mutex is held until spi_finalize_current_message() David Jander
2022-06-21 13:41 ` Andy Shevchenko
2022-06-21 6:12 ` [PATCH v3 11/11] spi: opportunistically skip ctlr->cur_msg_completion David Jander
2022-06-21 13:46 ` Andy Shevchenko
2022-06-21 17:21 ` [PATCH v3 00/11] Optimize spi_sync path Mark Brown
2022-06-24 20:31 ` Mark Brown
2022-06-28 6:32 ` David Jander
2022-06-28 10:31 ` Mark Brown
2022-06-28 10:31 ` Mark Brown
2022-07-15 14:13 ` Thomas Kopp
2022-07-18 6:02 ` David Jander [this message]
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