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authorJohn Crispin <john@phrozen.org>2017-07-25 14:46:01 +0200
committerJohn Crispin <john@phrozen.org>2017-07-26 09:14:20 +0200
commit6acb53c5267b96aa4f166c703998eaad3cb5d9fd (patch)
treeed8908aacf7588ff8c55b71ee0a60476fde33764 /target/linux/ramips/patches-4.9/101-mt7621-timer.patch
parent77645ffcd9ad767be02ea6d5cfe042928a3565d1 (diff)
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ralink: fix rcu_sched stalls on mt7621
there were 2 bugs *) core1 came up with a bad bogo mips, looks like the clock needed time to stabilize *) HPT frequency was not set making r4k timers not come up properly Signed-off-by: John Crispin <john@phrozen.org>
Diffstat (limited to 'target/linux/ramips/patches-4.9/101-mt7621-timer.patch')
-rw-r--r--target/linux/ramips/patches-4.9/101-mt7621-timer.patch119
1 files changed, 119 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-4.9/101-mt7621-timer.patch b/target/linux/ramips/patches-4.9/101-mt7621-timer.patch
new file mode 100644
index 0000000000..ca90f5d0e3
--- /dev/null
+++ b/target/linux/ramips/patches-4.9/101-mt7621-timer.patch
@@ -0,0 +1,119 @@
+Index: linux-4.9.37/arch/mips/kernel/smp-cmp.c
+===================================================================
+--- linux-4.9.37.orig/arch/mips/kernel/smp-cmp.c
++++ linux-4.9.37/arch/mips/kernel/smp-cmp.c
+@@ -43,6 +43,10 @@ static void cmp_init_secondary(void)
+ {
+ struct cpuinfo_mips *c __maybe_unused = &current_cpu_data;
+
++ printk("%s:%s[%d]%x\n", __FILE__, __func__, __LINE__, c->core);
++ c->core = (read_c0_ebase() & 0x3ff) >> (fls(smp_num_siblings)-1);
++ printk("%s:%s[%d]%x\n", __FILE__, __func__, __LINE__, c->core);
++
+ /* Assume GIC is present */
+ change_c0_status(ST0_IM, STATUSF_IP2 | STATUSF_IP3 | STATUSF_IP4 |
+ STATUSF_IP5 | STATUSF_IP6 | STATUSF_IP7);
+Index: linux-4.9.37/arch/mips/ralink/mt7621.c
+===================================================================
+--- linux-4.9.37.orig/arch/mips/ralink/mt7621.c
++++ linux-4.9.37/arch/mips/ralink/mt7621.c
+@@ -18,6 +18,7 @@
+ #include <asm/mach-ralink/ralink_regs.h>
+ #include <asm/mach-ralink/mt7621.h>
+ #include <asm/mips-boards/launch.h>
++#include <asm/delay.h>
+
+ #include <pinmux.h>
+
+@@ -179,6 +180,58 @@ bool plat_cpu_core_present(int core)
+ return true;
+ }
+
++#define LPS_PREC 8
++/*
++* Re-calibration lpj(loop-per-jiffy).
++* (derived from kernel/calibrate.c)
++*/
++static int udelay_recal(void)
++{
++ unsigned int i, lpj = 0;
++ unsigned long ticks, loopbit;
++ int lps_precision = LPS_PREC;
++
++ lpj = (1<<12);
++
++ while ((lpj <<= 1) != 0) {
++ /* wait for "start of" clock tick */
++ ticks = jiffies;
++ while (ticks == jiffies)
++ /* nothing */;
++
++ /* Go .. */
++ ticks = jiffies;
++ __delay(lpj);
++ ticks = jiffies - ticks;
++ if (ticks)
++ break;
++ }
++
++ /*
++ * Do a binary approximation to get lpj set to
++ * equal one clock (up to lps_precision bits)
++ */
++ lpj >>= 1;
++ loopbit = lpj;
++ while (lps_precision-- && (loopbit >>= 1)) {
++ lpj |= loopbit;
++ ticks = jiffies;
++ while (ticks == jiffies)
++ /* nothing */;
++ ticks = jiffies;
++ __delay(lpj);
++ if (jiffies != ticks) /* longer than 1 tick */
++ lpj &= ~loopbit;
++ }
++ printk(KERN_INFO "%d CPUs re-calibrate udelay(lpj = %d)\n", NR_CPUS, lpj);
++
++ for(i=0; i< NR_CPUS; i++)
++ cpu_data[i].udelay_val = lpj;
++
++ return 0;
++}
++device_initcall(udelay_recal);
++
+ void prom_soc_init(struct ralink_soc_info *soc_info)
+ {
+ void __iomem *sysc = (void __iomem *) KSEG1ADDR(MT7621_SYSC_BASE);
+Index: linux-4.9.37/arch/mips/ralink/Kconfig
+===================================================================
+--- linux-4.9.37.orig/arch/mips/ralink/Kconfig
++++ linux-4.9.37/arch/mips/ralink/Kconfig
+@@ -56,6 +56,7 @@ choice
+ select COMMON_CLK
+ select CLKSRC_MIPS_GIC
+ select HW_HAS_PCI
++ select GENERIC_CLOCKEVENTS_BROADCAST
+ endchoice
+
+ choice
+Index: linux-4.9.37/arch/mips/ralink/timer-gic.c
+===================================================================
+--- linux-4.9.37.orig/arch/mips/ralink/timer-gic.c
++++ linux-4.9.37/arch/mips/ralink/timer-gic.c
+@@ -12,6 +12,7 @@
+ #include <linux/of.h>
+ #include <linux/clk-provider.h>
+ #include <linux/clocksource.h>
++#include <asm/time.h>
+
+ #include "common.h"
+
+@@ -19,6 +20,8 @@ void __init plat_time_init(void)
+ {
+ ralink_of_remap();
+
++ mips_hpt_frequency = 880000000 / 2;
++
+ of_clk_init(NULL);
+ clocksource_probe();
+ }