qemu/hw-rtc-Fixed-loongson-rtc-emulation-errors.patch

From 4044284b230182cbaeb401bdb1b65dcbd11c7550 Mon Sep 17 00:00:00 2001
From: Xianglai Li <lixianglai@loongson.cn>
Date: Mon, 7 Apr 2025 18:59:42 +0800
Subject: [PATCH] hw/rtc: Fixed loongson rtc emulation errors

The expire time is sent to the timer only
when the expire Time is greater than 0 or
greater than now. Otherwise, the timer
will trigger interruption continuously.

Timer interrupts are sent using pulse functions.

Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
---
 hw/loongarch/virt.c |  9 +++++++--
 hw/rtc/ls7a_rtc.c   | 22 +++++++++++++---------
 2 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index 0c24e632bb..ce026a4c3c 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -51,6 +51,11 @@
 #include "qemu/error-report.h"
 #include "qemu/guest-random.h"
 
+#define FDT_IRQ_FLAGS_EDGE_LO_HI 1
+#define FDT_IRQ_FLAGS_EDGE_HI_LO 2
+#define FDT_IRQ_FLAGS_LEVEL_HI 4
+#define FDT_IRQ_FLAGS_LEVEL_LO 8
+
 static bool virt_is_veiointc_enabled(LoongArchVirtMachineState *lvms)
 {
     if (lvms->veiointc == ON_OFF_AUTO_OFF) {
@@ -275,7 +280,7 @@ static void fdt_add_rtc_node(LoongArchVirtMachineState *lvms,
                             "loongson,ls7a-rtc");
     qemu_fdt_setprop_sized_cells(ms->fdt, nodename, "reg", 2, base, 2, size);
     qemu_fdt_setprop_cells(ms->fdt, nodename, "interrupts",
-                           VIRT_RTC_IRQ - VIRT_GSI_BASE , 0x4);
+                           VIRT_RTC_IRQ - VIRT_GSI_BASE , FDT_IRQ_FLAGS_EDGE_LO_HI);
     qemu_fdt_setprop_cell(ms->fdt, nodename, "interrupt-parent",
                           *pch_pic_phandle);
     g_free(nodename);
@@ -334,7 +339,7 @@ static void fdt_add_uart_node(LoongArchVirtMachineState *lvms,
     qemu_fdt_setprop_cell(ms->fdt, nodename, "clock-frequency", 100000000);
     if (chosen)
         qemu_fdt_setprop_string(ms->fdt, "/chosen", "stdout-path", nodename);
-    qemu_fdt_setprop_cells(ms->fdt, nodename, "interrupts", irq, 0x4);
+    qemu_fdt_setprop_cells(ms->fdt, nodename, "interrupts", irq, FDT_IRQ_FLAGS_LEVEL_HI);
     qemu_fdt_setprop_cell(ms->fdt, nodename, "interrupt-parent",
                           *pch_pic_phandle);
     g_free(nodename);
diff --git a/hw/rtc/ls7a_rtc.c b/hw/rtc/ls7a_rtc.c
index 1f9e38a735..be9546c850 100644
--- a/hw/rtc/ls7a_rtc.c
+++ b/hw/rtc/ls7a_rtc.c
@@ -145,20 +145,22 @@ static void toymatch_write(LS7ARtcState *s, uint64_t val, int num)
         now = qemu_clock_get_ms(rtc_clock);
         toymatch_val_to_time(s, val, &tm);
         expire_time = now + (qemu_timedate_diff(&tm) - s->offset_toy) * 1000;
-        timer_mod(s->toy_timer[num], expire_time);
+        if (expire_time > now)
+            timer_mod(s->toy_timer[num], expire_time);
     }
 }
 
 static void rtcmatch_write(LS7ARtcState *s, uint64_t val, int num)
 {
-    uint64_t expire_ns;
+    int64_t expire_ns;
 
     /* it do not support write when toy disabled */
     if (rtc_enabled(s)) {
         s->rtcmatch[num] = val;
         /* calculate expire time */
         expire_ns = ticks_to_ns(val) - ticks_to_ns(s->offset_rtc);
-        timer_mod_ns(s->rtc_timer[num], expire_ns);
+        if (expire_ns > 0)
+            timer_mod_ns(s->rtc_timer[num], expire_ns);
     }
 }
 
@@ -185,7 +187,7 @@ static void ls7a_rtc_stop(LS7ARtcState *s)
 static void ls7a_toy_start(LS7ARtcState *s)
 {
     int i;
-    uint64_t expire_time, now;
+    int64_t expire_time, now;
     struct tm tm = {};
 
     now = qemu_clock_get_ms(rtc_clock);
@@ -194,19 +196,21 @@ static void ls7a_toy_start(LS7ARtcState *s)
     for (i = 0; i < TIMER_NUMS; i++) {
         toymatch_val_to_time(s, s->toymatch[i], &tm);
         expire_time = now + (qemu_timedate_diff(&tm) - s->offset_toy) * 1000;
-        timer_mod(s->toy_timer[i], expire_time);
+        if (expire_time > now)
+            timer_mod(s->toy_timer[i], expire_time);
     }
 }
 
 static void ls7a_rtc_start(LS7ARtcState *s)
 {
     int i;
-    uint64_t expire_time;
+    int64_t expire_time;
 
     /* recalculate expire time and enable timer */
     for (i = 0; i < TIMER_NUMS; i++) {
         expire_time = ticks_to_ns(s->rtcmatch[i]) - ticks_to_ns(s->offset_rtc);
-        timer_mod_ns(s->rtc_timer[i], expire_time);
+        if (expire_time > 0)
+            timer_mod_ns(s->rtc_timer[i], expire_time);
     }
 }
 
@@ -370,7 +374,7 @@ static void toy_timer_cb(void *opaque)
     LS7ARtcState *s = opaque;
 
     if (toy_enabled(s)) {
-        qemu_irq_raise(s->irq);
+        qemu_irq_pulse(s->irq);
     }
 }
 
@@ -379,7 +383,7 @@ static void rtc_timer_cb(void *opaque)
     LS7ARtcState *s = opaque;
 
     if (rtc_enabled(s)) {
-        qemu_irq_raise(s->irq);
+        qemu_irq_pulse(s->irq);
     }
 }
 
-- 
2.41.0.windows.1