Modern qemu uses 24Kf CPU at 320 MHz for malta board.
By default arch/mips/lib/csrc-r4k.c clocksource driver
relies on CPU running at 200 MHz and CP0 timer runs
at the half of CPU clock that is 100 MHz.
As a result the `sleep 15` command runs for only
9 seconds on qemu-malta.
Setting CPU clock to 320 MHz in the qemu-malta.dts file
fixes the problem.
See these qemu commits for details:
eea1f5bac6f hw/mips/malta: Set CPU frequency to 320 MHz
a7519f2b39b mips: malta/boston: replace cpu_model with cpu_type
Signed-off-by: Antony Pavlov <antonynpavlov@xxxxxxxxx>
---
arch/mips/Kconfig | 3 +++
arch/mips/dts/qemu-malta.dts | 20 ++++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index e05ee2d7f1a..89fc16be133 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -79,6 +79,9 @@ config MACH_MIPS_MALTA
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_LITTLE_ENDIAN
select HAS_DEBUG_LL
+ select COMMON_CLK
+ select COMMON_CLK_OF_PROVIDER
+ select CLKDEV_LOOKUP
select GPIOLIB
select HW_HAS_PCI
select HAVE_PBL_IMAGE
diff --git a/arch/mips/dts/qemu-malta.dts b/arch/mips/dts/qemu-malta.dts
index f08832735f8..c2bc03dd463 100644
--- a/arch/mips/dts/qemu-malta.dts
+++ b/arch/mips/dts/qemu-malta.dts
@@ -19,6 +19,26 @@ memory@0 {
reg = <0x00000000 0x10000000>;
};
+ clocks {
+ ref_clk: ref_clk {
+ #clock-cells = <0>;
+ compatible = "fixed-clock";
+ clock-frequency = <320000000>;
+ };
+ };
+
+ cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ cpu@0 {
+ device_type = "cpu";
+ compatible = "mips,mips24Kf";
+ clocks = <&ref_clk>;
+ reg = <0>;
+ };
+ };
+
uart0: serial@180003f8 {
compatible = "ns16550a";
reg = <0x180003f8 0x08>;
--
2.39.0
