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[PATCH 2/4] hw/sd/sdhci: Resume pending DMA transfers on MMIO accesses


From: Philippe Mathieu-Daudé
Subject: [PATCH 2/4] hw/sd/sdhci: Resume pending DMA transfers on MMIO accesses
Date: Thu, 3 Sep 2020 19:28:04 +0200

If we have pending DMA requests scheduled, process them first.
So far we don't need to implement a bottom half to process them.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/sd/sdhci.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index 703357e94a7..2b197631870 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -945,11 +945,21 @@ sdhci_buff_access_is_sequential(SDHCIState *s, unsigned 
byte_num)
     return true;
 }
 
+static void sdhci_resume_pending_transfer(SDHCIState *s)
+{
+    timer_del(s->transfer_timer);
+    sdhci_data_transfer(s);
+}
+
 static uint64_t sdhci_read(void *opaque, hwaddr offset, unsigned size)
 {
     SDHCIState *s = (SDHCIState *)opaque;
     uint32_t ret = 0;
 
+    if (timer_pending(s->transfer_timer)) {
+        sdhci_resume_pending_transfer(s);
+    }
+
     switch (offset & ~0x3) {
     case SDHC_SYSAD:
         ret = s->sdmasysad;
@@ -1093,6 +1103,10 @@ sdhci_write(void *opaque, hwaddr offset, uint64_t val, 
unsigned size)
     uint32_t value = val;
     value <<= shift;
 
+    if (timer_pending(s->transfer_timer)) {
+        sdhci_resume_pending_transfer(s);
+    }
+
     switch (offset & ~0x3) {
     case SDHC_SYSAD:
         s->sdmasysad = (s->sdmasysad & mask) | value;
-- 
2.26.2




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