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There is a variant of MT7621 which contains only one CPU core instead of 2.
This is not reflected in the config register, so the kernel detects more
physical cores, which leads to a hang on SMP bringup.
Add a hack to detect missing cores.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/arch/mips/kernel/smp-cps.c
+++ b/arch/mips/kernel/smp-cps.c
@@ -43,6 +43,11 @@ static unsigned core_vpe_count(unsigned
return mips_cps_numvps(cluster, core);
}
+bool __weak plat_cpu_core_present(int core)
+{
+ return true;
+}
+
static void __init cps_smp_setup(void)
{
unsigned int nclusters, ncores, nvpes, core_vpes;
@@ -60,6 +65,8 @@ static void __init cps_smp_setup(void)
ncores = mips_cps_numcores(cl);
for (c = 0; c < ncores; c++) {
+ if (!plat_cpu_core_present(c))
+ continue;
core_vpes = core_vpe_count(cl, c);
if (c > 0)
--- a/arch/mips/ralink/mt7621.c
+++ b/arch/mips/ralink/mt7621.c
@@ -13,6 +13,7 @@
#include <asm/mips-cps.h>
#include <asm/mach-ralink/ralink_regs.h>
#include <asm/mach-ralink/mt7621.h>
+#include <asm/mips-boards/launch.h>
#include <pinmux.h>
@@ -160,6 +161,20 @@ void __init ralink_of_remap(void)
panic("Failed to remap core resources");
}
+bool plat_cpu_core_present(int core)
+{
+ struct cpulaunch *launch = (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH);
+
+ if (!core)
+ return true;
+ launch += core * 2; /* 2 VPEs per core */
+ if (!(launch->flags & LAUNCH_FREADY))
+ return false;
+ if (launch->flags & (LAUNCH_FGO | LAUNCH_FGONE))
+ return false;
+ return true;
+}
+
void prom_soc_init(struct ralink_soc_info *soc_info)
{
void __iomem *sysc = (void __iomem *) KSEG1ADDR(MT7621_SYSC_BASE);
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