diff options
| author | David Bauer <mail@david-bauer.net> | 2024-01-09 20:52:56 +0100 |
|---|---|---|
| committer | David Bauer <mail@david-bauer.net> | 2024-01-11 01:40:50 +0100 |
| commit | 2fe8ecd880396b5ae25fe9583aaa1d71be0b8468 (patch) | |
| tree | 8bc1126e40443503d09111117de4695b959db611 /target/linux | |
| parent | 6b0db8592a3e4342c32111491948f32d5bc0087f (diff) | |
| download | upstream-2fe8ecd880396b5ae25fe9583aaa1d71be0b8468.tar.gz upstream-2fe8ecd880396b5ae25fe9583aaa1d71be0b8468.tar.bz2 upstream-2fe8ecd880396b5ae25fe9583aaa1d71be0b8468.zip | |
ath79: read back reset register
Read back the reset register in order to flush the cache. This fixes
spurious reboot hangs on TP-Link TL-WDR3600 and TL-WDR4300 with Zentel
DRAM chips.
This issue was fixed in the past, but switching to the reset-driver
specific implementation removed the cache barrier which was previously
implicitly added by reading back the register in question.
Link: https://github.com/freifunk-gluon/gluon/issues/2904
Link: https://github.com/openwrt/openwrt/issues/13043
Link: https://dev.archive.openwrt.org/ticket/17839
Link: f8a7bfe1cb2c ("MIPS: ath79: fix system restart")
Signed-off-by: David Bauer <mail@david-bauer.net>
Diffstat (limited to 'target/linux')
| -rw-r--r-- | target/linux/ath79/patches-5.15/100-reset-ath79-read-back-reset-register.patch | 33 | ||||
| -rw-r--r-- | target/linux/ath79/patches-6.1/100-reset-ath79-read-back-reset-register.patch | 33 |
2 files changed, 66 insertions, 0 deletions
diff --git a/target/linux/ath79/patches-5.15/100-reset-ath79-read-back-reset-register.patch b/target/linux/ath79/patches-5.15/100-reset-ath79-read-back-reset-register.patch new file mode 100644 index 00000000000..7aa501514df --- /dev/null +++ b/target/linux/ath79/patches-5.15/100-reset-ath79-read-back-reset-register.patch @@ -0,0 +1,33 @@ +From 661edfc3dab943a67c8821353b63cc23057f7ce9 Mon Sep 17 00:00:00 2001 +From: David Bauer <mail@david-bauer.net> +Date: Tue, 9 Jan 2024 20:48:46 +0100 +Subject: [PATCH] reset: ath79: read back reset register + +Read back the reset register in order to flush the cache. This fixes +spurious reboot hangs on TP-Link TL-WDR3600 and TL-WDR4300 with Zentel +DRAM chips. + +This issue was fixed in the past, but switching to the reset-driver +specific implementation removed the old fix. + +Link: https://github.com/freifunk-gluon/gluon/issues/2904 +Link: https://github.com/openwrt/openwrt/issues/13043 +Link: https://dev.archive.openwrt.org/ticket/17839 +Link: f8a7bfe1cb2c ("MIPS: ath79: fix system restart") + +Signed-off-by: David Bauer <mail@david-bauer.net> +--- + drivers/reset/reset-ath79.c | 2 ++ + 1 file changed, 2 insertions(+) + +--- a/drivers/reset/reset-ath79.c ++++ b/drivers/reset/reset-ath79.c +@@ -37,6 +37,8 @@ static int ath79_reset_update(struct res + else + val &= ~BIT(id); + writel(val, ath79_reset->base); ++ /* Flush cache */ ++ readl(ath79_reset->base); + spin_unlock_irqrestore(&ath79_reset->lock, flags); + + return 0; diff --git a/target/linux/ath79/patches-6.1/100-reset-ath79-read-back-reset-register.patch b/target/linux/ath79/patches-6.1/100-reset-ath79-read-back-reset-register.patch new file mode 100644 index 00000000000..7aa501514df --- /dev/null +++ b/target/linux/ath79/patches-6.1/100-reset-ath79-read-back-reset-register.patch @@ -0,0 +1,33 @@ +From 661edfc3dab943a67c8821353b63cc23057f7ce9 Mon Sep 17 00:00:00 2001 +From: David Bauer <mail@david-bauer.net> +Date: Tue, 9 Jan 2024 20:48:46 +0100 +Subject: [PATCH] reset: ath79: read back reset register + +Read back the reset register in order to flush the cache. This fixes +spurious reboot hangs on TP-Link TL-WDR3600 and TL-WDR4300 with Zentel +DRAM chips. + +This issue was fixed in the past, but switching to the reset-driver +specific implementation removed the old fix. + +Link: https://github.com/freifunk-gluon/gluon/issues/2904 +Link: https://github.com/openwrt/openwrt/issues/13043 +Link: https://dev.archive.openwrt.org/ticket/17839 +Link: f8a7bfe1cb2c ("MIPS: ath79: fix system restart") + +Signed-off-by: David Bauer <mail@david-bauer.net> +--- + drivers/reset/reset-ath79.c | 2 ++ + 1 file changed, 2 insertions(+) + +--- a/drivers/reset/reset-ath79.c ++++ b/drivers/reset/reset-ath79.c +@@ -37,6 +37,8 @@ static int ath79_reset_update(struct res + else + val &= ~BIT(id); + writel(val, ath79_reset->base); ++ /* Flush cache */ ++ readl(ath79_reset->base); + spin_unlock_irqrestore(&ath79_reset->lock, flags); + + return 0; |