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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Aleksander Jan Bajkowski <olek2@wp.pl>,
	"David S . Miller" <davem@davemloft.net>,
	Sasha Levin <sashal@kernel.org>,
	john@phrozen.org, tsbogend@alpha.franken.de, maz@kernel.org,
	hauke@hauke-m.de, linux-mips@vger.kernel.org
Subject: [PATCH AUTOSEL 4.9 04/33] MIPS: lantiq: dma: add small delay after reset
Date: Mon,  8 Nov 2021 20:07:38 -0500	[thread overview]
Message-ID: <20211109010807.1191567-4-sashal@kernel.org> (raw)
In-Reply-To: <20211109010807.1191567-1-sashal@kernel.org>

From: Aleksander Jan Bajkowski <olek2@wp.pl>

[ Upstream commit c12aa581f6d5e80c3c3675ab26a52c2b3b62f76e ]

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 cef811755123f..d89a9bcf92c85 100644
--- a/arch/mips/lantiq/xway/dma.c
+++ b/arch/mips/lantiq/xway/dma.c
@@ -21,6 +21,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/module.h>
 #include <linux/clk.h>
+#include <linux/delay.h>
 #include <linux/err.h>
 
 #include <lantiq_soc.h>
@@ -232,6 +233,8 @@ 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);
 
-- 
2.33.0


  parent reply	other threads:[~2021-11-09  1:23 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-09  1:07 [PATCH AUTOSEL 4.9 01/33] Bluetooth: sco: Fix lock_sock() blockage by memcpy_from_msg() Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 02/33] Bluetooth: fix use-after-free error in lock_sock_nested() Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 03/33] platform/x86: wmi: do not fail if disabling fails Sasha Levin
2021-11-09  1:07 ` Sasha Levin [this message]
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 05/33] MIPS: lantiq: dma: reset correct number of channel Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 06/33] locking/lockdep: Avoid RCU-induced noinstr fail Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 07/33] smackfs: Fix use-after-free in netlbl_catmap_walk() Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 08/33] NET: IPV4: fix error "do not initialise globals to 0" Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 09/33] x86: Increase exception stack sizes Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 10/33] media: mt9p031: Fix corrupted frame after restarting stream Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 11/33] media: netup_unidvb: handle interrupt properly according to the firmware Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 12/33] media: uvcvideo: Set capability in s_param Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 13/33] media: s5p-mfc: fix possible null-pointer dereference in s5p_mfc_probe() Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 14/33] media: mceusb: return without resubmitting URB in case of -EPROTO error Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 15/33] ia64: don't do IA64_CMPXCHG_DEBUG without CONFIG_PRINTK Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 16/33] ACPICA: Avoid evaluating methods too early during system resume Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 17/33] media: usb: dvd-usb: fix uninit-value bug in dibusb_read_eeprom_byte() Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 18/33] tracefs: Have tracefs directories not set OTH permission bits by default Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 19/33] ath: dfs_pattern_detector: Fix possible null-pointer dereference in channel_detector_create() Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 20/33] ACPI: battery: Accept charges over the design capacity as full Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 21/33] memstick: r592: Fix a UAF bug when removing the driver Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 22/33] lib/xz: Avoid overlapping memcpy() with invalid input with in-place decompression Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 23/33] lib/xz: Validate the value before assigning it to an enum variable Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 24/33] tracing/cfi: Fix cmp_entries_* functions signature mismatch Sasha Levin
2021-11-09  1:07 ` [PATCH AUTOSEL 4.9 25/33] mwl8k: Fix use-after-free in mwl8k_fw_state_machine() Sasha Levin
2021-11-09  1:08 ` [PATCH AUTOSEL 4.9 26/33] PM: hibernate: Get block device exclusively in swsusp_check() Sasha Levin
2021-11-09  1:08 ` [PATCH AUTOSEL 4.9 27/33] iwlwifi: mvm: disable RX-diversity in powersave Sasha Levin
2021-11-09  1:08 ` [PATCH AUTOSEL 4.9 28/33] smackfs: use __GFP_NOFAIL for smk_cipso_doi() Sasha Levin
2021-11-09  1:08 ` [PATCH AUTOSEL 4.9 29/33] ARM: clang: Do not rely on lr register for stacktrace Sasha Levin
2021-11-09  1:08 ` [PATCH AUTOSEL 4.9 30/33] ARM: 9136/1: ARMv7-M uses BE-8, not BE-32 Sasha Levin
2021-11-09  1:08 ` [PATCH AUTOSEL 4.9 31/33] spi: bcm-qspi: Fix missing clk_disable_unprepare() on error in bcm_qspi_probe() Sasha Levin
2021-11-09  1:08 ` [PATCH AUTOSEL 4.9 32/33] parisc: fix warning in flush_tlb_all Sasha Levin
2021-11-09  1:08 ` [PATCH AUTOSEL 4.9 33/33] parisc/kgdb: add kgdb_roundup() to make kgdb work with idle polling Sasha Levin

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