diff options
Diffstat (limited to 'target/linux/ar71xx/patches-4.4/003-MIPS-ath79-make-bootconsole-wait-for-both-THRE-and-T.patch')
| -rw-r--r-- | target/linux/ar71xx/patches-4.4/003-MIPS-ath79-make-bootconsole-wait-for-both-THRE-and-T.patch | 49 |
1 files changed, 0 insertions, 49 deletions
diff --git a/target/linux/ar71xx/patches-4.4/003-MIPS-ath79-make-bootconsole-wait-for-both-THRE-and-T.patch b/target/linux/ar71xx/patches-4.4/003-MIPS-ath79-make-bootconsole-wait-for-both-THRE-and-T.patch deleted file mode 100644 index 2eba263732..0000000000 --- a/target/linux/ar71xx/patches-4.4/003-MIPS-ath79-make-bootconsole-wait-for-both-THRE-and-T.patch +++ /dev/null @@ -1,49 +0,0 @@ -From f1ba020af5076172c9d29006a747ccf40027fedc Mon Sep 17 00:00:00 2001 -Message-Id: <f1ba020af5076172c9d29006a747ccf40027fedc.1458840219.git.mschiffer@universe-factory.net> -From: Matthias Schiffer <mschiffer@universe-factory.net> -Date: Thu, 24 Mar 2016 15:34:05 +0100 -Subject: [PATCH] MIPS: ath79: make bootconsole wait for both THRE and TEMT - -This makes the ath79 bootconsole behave the same way as the generic 8250 -bootconsole. - -Also waiting for TEMT (transmit buffer is empty) instead of just THRE -(transmit buffer is not full) ensures that all characters have been -transmitted before the real serial driver starts reconfiguring the serial -controller (which would sometimes result in garbage being transmitted.) -This change does not cause a visible performance loss. - -In addition, this seems to fix a hang observed in certain configurations on -many AR7xxx/AR9xxx SoCs during autoconfig of the real serial driver. - -A more complete follow-up patch will disable 8250 autoconfig for ath79 -altogether (the serial controller is detected as a 16550A, which is not -fully compatible with the ath79 serial, and the autoconfig may lead to -undefined behavior on ath79.) - -Cc: <stable@vger.kernel.org> -Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net> ---- - arch/mips/ath79/early_printk.c | 6 ++++-- - 1 file changed, 4 insertions(+), 2 deletions(-) - ---- a/arch/mips/ath79/early_printk.c -+++ b/arch/mips/ath79/early_printk.c -@@ -31,13 +31,15 @@ static inline void prom_putchar_wait(voi - } while (1); - } - -+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) -+ - static void prom_putchar_ar71xx(unsigned char ch) - { - void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE)); - -- prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE); -+ prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY); - __raw_writel(ch, base + UART_TX * 4); -- prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE); -+ prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY); - } - - static void prom_putchar_ar933x(unsigned char ch) |