From: Robin Gong <yibin.gong@nxp.com>
To: broonie@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de,
festevam@gmail.com, robin.murphy@arm.com,
matthias.schiffer@ew.tq-group.com
Cc: kernel@pengutronix.de, linux-imx@nxp.com,
linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v1 RFC 0/2] introduce fallback to pio in spi core
Date: Thu, 11 Jun 2020 20:58:28 +0800 [thread overview]
Message-ID: <1591880310-1813-1-git-send-email-yibin.gong@nxp.com> (raw)
Introudce fallback pio way at spi core level so that the tx/rx buffer
mapped by spi core for dma could be unmap and fallback pio again. Hence no
need the below patch where 'dma_sync_sg_for_devic' to sync fresh data back
into 'device' memory and sync to 'cpu' again in spi core.
https://www.spinics.net/lists/arm-kernel/msg812236.html
If you want to use this fallback feature, please set 'master->flags' with
SPI_MASTER_FALLBACK and add 'master->fallback' checking in your can_dma()
to ensure it can fallback to pio.
Robin Gong (2):
spi: introduce fallback to pio
spi: spi-imx: add fallback feature
drivers/spi/spi-imx.c | 23 +++++------------------
drivers/spi/spi.c | 11 +++++++++++
include/linux/spi/spi.h | 4 ++++
3 files changed, 20 insertions(+), 18 deletions(-)
--
2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Robin Gong <yibin.gong@nxp.com>
To: broonie@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de,
festevam@gmail.com, robin.murphy@arm.com,
matthias.schiffer@ew.tq-group.com
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-imx@nxp.com,
kernel@pengutronix.de, linux-spi@vger.kernel.org
Subject: [PATCH v1 RFC 0/2] introduce fallback to pio in spi core
Date: Thu, 11 Jun 2020 20:58:28 +0800 [thread overview]
Message-ID: <1591880310-1813-1-git-send-email-yibin.gong@nxp.com> (raw)
Introudce fallback pio way at spi core level so that the tx/rx buffer
mapped by spi core for dma could be unmap and fallback pio again. Hence no
need the below patch where 'dma_sync_sg_for_devic' to sync fresh data back
into 'device' memory and sync to 'cpu' again in spi core.
https://www.spinics.net/lists/arm-kernel/msg812236.html
If you want to use this fallback feature, please set 'master->flags' with
SPI_MASTER_FALLBACK and add 'master->fallback' checking in your can_dma()
to ensure it can fallback to pio.
Robin Gong (2):
spi: introduce fallback to pio
spi: spi-imx: add fallback feature
drivers/spi/spi-imx.c | 23 +++++------------------
drivers/spi/spi.c | 11 +++++++++++
include/linux/spi/spi.h | 4 ++++
3 files changed, 20 insertions(+), 18 deletions(-)
--
2.7.4
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next reply other threads:[~2020-06-11 4:58 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-11 12:58 Robin Gong [this message]
2020-06-11 12:58 ` [PATCH v1 RFC 0/2] introduce fallback to pio in spi core Robin Gong
2020-06-11 12:58 ` [PATCH v1 RFC 1/2] spi: introduce fallback to pio Robin Gong
2020-06-11 12:58 ` Robin Gong
2020-06-11 13:40 ` Mark Brown
2020-06-11 13:40 ` Mark Brown
2020-06-12 2:18 ` Robin Gong
2020-06-12 2:18 ` Robin Gong
2020-06-12 10:13 ` Mark Brown
2020-06-12 10:13 ` Mark Brown
2020-06-12 13:48 ` Robin Gong
2020-06-12 13:48 ` Robin Gong
2020-06-12 14:16 ` Mark Brown
2020-06-12 14:16 ` Mark Brown
2020-06-14 13:04 ` Robin Gong
2020-06-14 13:04 ` Robin Gong
2020-06-15 7:19 ` Vinod Koul
2020-06-15 7:19 ` Vinod Koul
2020-06-15 8:59 ` Robin Gong
2020-06-15 8:59 ` Robin Gong
2020-06-15 11:25 ` Vinod Koul
2020-06-15 11:25 ` Vinod Koul
2020-06-16 3:05 ` Robin Gong
2020-06-16 3:05 ` Robin Gong
2020-06-15 12:35 ` Mark Brown
2020-06-15 12:35 ` Mark Brown
2020-06-15 13:35 ` Robin Gong
2020-06-15 13:35 ` Robin Gong
2020-06-15 13:39 ` Mark Brown
2020-06-15 13:39 ` Mark Brown
2020-06-15 14:18 ` Robin Gong
2020-06-15 14:18 ` Robin Gong
2020-06-15 14:36 ` Mark Brown
2020-06-15 14:36 ` Mark Brown
2020-06-15 14:53 ` Robin Gong
2020-06-15 14:53 ` Robin Gong
2020-06-15 14:55 ` Mark Brown
2020-06-15 14:55 ` Mark Brown
2020-06-16 2:03 ` Robin Gong
2020-06-16 2:03 ` Robin Gong
2020-06-16 9:59 ` Mark Brown
2020-06-16 9:59 ` Mark Brown
2020-06-16 10:13 ` Robin Gong
2020-06-16 10:13 ` Robin Gong
2020-06-16 10:26 ` Mark Brown
2020-06-16 10:26 ` Mark Brown
2020-06-16 12:29 ` Robin Gong
2020-06-16 12:29 ` Robin Gong
2020-06-11 12:58 ` [PATCH v1 RFC 2/2] spi: spi-imx: add fallback feature Robin Gong
2020-06-11 12:58 ` Robin Gong
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