From: Aleksander Jan Bajkowski <olek2@wp.pl>
To: john@phrozen.org, tsbogend@alpha.franken.de, olek2@wp.pl,
maz@kernel.org, ralf@linux-mips.org, ralph.hempel@lantiq.com,
davem@davemloft.net, kuba@kernel.org, robh+dt@kernel.org,
hauke@hauke-m.de, dev@kresin.me, arnd@arndb.de, jgg@ziepe.ca,
netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH net-next 1/8] MIPS: lantiq: dma: add small delay after reset
Date: Tue, 14 Sep 2021 23:20:58 +0200 [thread overview]
Message-ID: <20210914212105.76186-1-olek2@wp.pl> (raw)
Reading the DMA registers immediately after the reset causes
Data Bus Error. Adding a small delay fixes this issue.
Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
---
arch/mips/lantiq/xway/dma.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/mips/lantiq/xway/dma.c b/arch/mips/lantiq/xway/dma.c
index 63dccb2ed08b..2784715933d1 100644
--- a/arch/mips/lantiq/xway/dma.c
+++ b/arch/mips/lantiq/xway/dma.c
@@ -11,6 +11,7 @@
#include <linux/export.h>
#include <linux/spinlock.h>
#include <linux/clk.h>
+#include <linux/delay.h>
#include <linux/err.h>
#include <linux/of.h>
@@ -222,6 +223,8 @@ ltq_dma_init(struct platform_device *pdev)
clk_enable(clk);
ltq_dma_w32_mask(0, DMA_RESET, LTQ_DMA_CTRL);
+ usleep_range(1, 10);
+
/* disable all interrupts */
ltq_dma_w32(0, LTQ_DMA_IRNEN);
--
2.30.2
next reply other threads:[~2021-09-14 21:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-14 21:20 Aleksander Jan Bajkowski [this message]
2021-09-14 21:20 ` [PATCH net-next 2/8] MIPS: lantiq: dma: reset correct number of channel Aleksander Jan Bajkowski
2021-09-14 21:21 ` [PATCH net-next 3/8] MIPS: lantiq: dma: fix burst length for DEU Aleksander Jan Bajkowski
2021-09-14 21:21 ` [PATCH net-next 4/8] MIPS: lantiq: dma: make the burst length configurable by the drivers Aleksander Jan Bajkowski
2021-09-14 22:40 ` Hauke Mehrtens
2021-09-14 21:21 ` [PATCH net-next 5/8] net: lantiq: configure the burst length in ethernet drivers Aleksander Jan Bajkowski
2021-09-14 22:36 ` Hauke Mehrtens
2021-09-19 18:16 ` Aleksander Bajkowski
2021-09-14 21:21 ` [PATCH net-next 6/8] dt-bindings: net: lantiq-xrx200-net: convert to the json-schema Aleksander Jan Bajkowski
2021-09-14 21:21 ` [PATCH net-next 7/8] dt-bindings: net: lantiq,etop-xway: Document Lantiq Xway ETOP bindings Aleksander Jan Bajkowski
2021-09-14 21:21 ` [PATCH net-next 8/8] dt-bindings: net: lantiq: Add the burst length properties Aleksander Jan Bajkowski
2021-09-15 10:30 ` [PATCH net-next 1/8] MIPS: lantiq: dma: add small delay after reset patchwork-bot+netdevbpf
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