From: Bryan Wu <cooloney@kernel.org>
To: dbrownell@users.sourceforge.net, akpm@linux-foundation.org
Cc: spi-devel-general@lists.sourceforge.net,
linux-kernel@vger.kernel.org,
Mike Frysinger <vapier.adi@gmail.com>,
Bryan Wu <cooloney@kernel.org>
Subject: [PATCH 14/20] Blackfin SPI Driver: tweak magic spi dma sequence to get it working on BF54x
Date: Fri, 6 Feb 2009 15:13:02 +0800 [thread overview]
Message-ID: <1233904388-5765-15-git-send-email-cooloney@kernel.org> (raw)
In-Reply-To: <1233904388-5765-1-git-send-email-cooloney@kernel.org>
From: Mike Frysinger <vapier.adi@gmail.com>
Without this changes, SPI DMA is not reliably under stress tests.
Obiviously it's a hardware issue which is not addressed by any document.
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
drivers/spi/spi_bfin5xx.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 748e98f..d8c4be1 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -862,8 +862,9 @@ static void pump_transfers(unsigned long data)
set_dma_start_addr(drv_data->dma_channel, dma_start_addr);
set_dma_config(drv_data->dma_channel, dma_config);
local_irq_save(flags);
- enable_dma(drv_data->dma_channel);
+ SSYNC();
write_CTRL(drv_data, cr);
+ enable_dma(drv_data->dma_channel);
dma_enable_irq(drv_data->dma_channel);
local_irq_restore(flags);
--
1.5.6.3
next prev parent reply other threads:[~2009-02-06 7:16 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-06 7:12 [PATCH 00/20] Blackfin SPI Driver fixing and updates Bryan Wu
2009-02-06 7:12 ` [PATCH 01/20] Blackfin SPI Driver: ensure cache coherency before doing DMA Bryan Wu
2009-02-06 7:12 ` [PATCH 02/20] Blackfin SPI Driver: Fix erroneous SPI Clock divisor calculation Bryan Wu
2009-02-06 7:12 ` [PATCH 03/20] Blackfin SPI Driver: remove useless <asm/cplbinit.h> Bryan Wu
2009-02-06 7:12 ` [PATCH 04/20] Blackfin SPI Driver: use len_in_bytes when we care about the number of bytes transferred Bryan Wu
2009-02-06 7:12 ` [PATCH 05/20] Blackfin SPI Driver: pass DMA overflow error to the higher level Bryan Wu
2009-02-06 7:12 ` [PATCH 06/20] Blackfin SPI Driver: unify duplicated code in dma read/write paths Bryan Wu
2009-02-06 7:12 ` [PATCH 07/20] Blackfin SPI Driver: drop bogus cast and touchup dma label Bryan Wu
2009-02-06 7:12 ` [PATCH 08/20] Blackfin SPI Driver: add a few more DMA debug messages Bryan Wu
2009-02-06 7:12 ` [PATCH 09/20] Blackfin SPI Driver: do not check for SPI errors if DMA itself did not flag any Bryan Wu
2009-02-06 7:12 ` [PATCH 10/20] Blackfin SPI Driver: use the properl BIT_CTL_xxx defines Bryan Wu
2009-02-06 7:12 ` [PATCH 11/20] Blackfin SPI Driver: SPI slave select code cleanup Bryan Wu
2009-02-06 7:13 ` [PATCH 12/20] Blackfin SPI Driver: get dma working for SPI flashes Bryan Wu
2009-02-06 7:13 ` [PATCH 13/20] Blackfin SPI Driver: add timeout while waiting for SPIF in dma irq handler Bryan Wu
2009-02-06 7:13 ` Bryan Wu [this message]
2009-02-06 7:13 ` [PATCH 15/20] Blackfin SPI Driver: fix bug - spi controller driver does not assert/deassert CS correctly Bryan Wu
2009-02-06 7:13 ` [PATCH 16/20] Blackfin SPI Driver: fix bug - correct usage of struct spi_transfer.cs_change Bryan Wu
2009-02-06 7:13 ` [PATCH 17/20] Blackfin SPI Driver: use bfin_spi_ prefix on all functions Bryan Wu
2009-02-06 7:13 ` [PATCH 18/20] Blackfin SPI Driver: fix NULL pointer crash Bryan Wu
2009-02-06 7:13 ` [PATCH 19/20] Blackfin SPI Driver: Add GPIO controlled SPI Slave Select support Bryan Wu
2009-02-06 7:13 ` [PATCH 20/20] Blackfin SPI Driver: Make mmc_spi driver work on Blackfin Bryan Wu
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