TCC78x: Make the NAND driver yield during reads (thanks to bertrik for spotting the obvious error that caused this to crash until now). Fixes the D2 'delay before playback starts' bug.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21465 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 11 insertions, 0 deletions

diff --git a/firmware/target/arm/ata-nand-telechips.c b/firmware/target/arm/ata-nand-telechips.c
index 5401f0d3ab..ceabf96169 100644
--- a/firmware/target/arm/ata-nand-telechips.c
+++ b/firmware/target/arm/ata-nand-telechips.c
@@ -40,6 +40,9 @@ long last_disk_activity = -1;
 /** static, private data **/
 static bool initialized = false;
 
+static long next_yield = 0;
+#define MIN_YIELD_PERIOD 1000
+
 static struct mutex ata_mtx SHAREDBSS_ATTR;
 
 #if defined(COWON_D2) || defined(IAUDIO_7)
@@ -714,6 +717,14 @@ int nand_read_sectors(IF_MV2(int drive,) unsigned long start, int incount,
                 return -1;
             }
 
+#ifdef CPU_TCC780X /* 77x doesn't have USEC_TIMER yet */
+            if (TIME_AFTER(USEC_TIMER, next_yield))
+            {
+                next_yield = USEC_TIMER + MIN_YIELD_PERIOD;
+                yield();
+            }
+#endif
+
             inbuf += SECTOR_SIZE;
             incount--;
             secmod++;