altos: Delay while waking up SD card a bit

This seems to make bringing the card from idle to ready mode more
reliable. If you spam the card with requests, it will eventually
whinge and shut down communications.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/drivers/ao_sdcard.c b/src/drivers/ao_sdcard.c
index 6314a30c95f876ce4a196208693b59261cc1b25f..c13017f07b1c6ad5f3b6b0523d909a859678c8e8 100644 (file)
--- a/src/drivers/ao_sdcard.c
+++ b/src/drivers/ao_sdcard.c
@@ -346,14 +346,16 @@ ao_sdcard_setup(void)
                        sdver2 = 1;
                }
 
-               for (i = 0; i < SDCARD_IDLE_RETRY; i++) {
+               for (i = 0; i < SDCARD_OP_COND_RETRY; i++) {
+                       ao_delay(AO_MS_TO_TICKS(10));
                        ret = ao_sdcard_app_send_op_cond(arg);
                        if (ret != SDCARD_STATUS_IDLE_STATE)
                                break;
                }
                if (ret != SDCARD_STATUS_READY_STATE) {
                        /* MMC */
-                       for (i = 0; i < SDCARD_IDLE_RETRY; i++) {
+                       for (i = 0; i < SDCARD_OP_COND_RETRY; i++) {
+                               ao_delay(AO_MS_TO_TICKS(10));
                                ret = ao_sdcard_send_op_cond();
                                if (ret != SDCARD_STATUS_IDLE_STATE)
                                        break;

diff --git a/src/drivers/ao_sdcard.h b/src/drivers/ao_sdcard.h
index 0d1464b379c0cab70af714bfe374b81615bea201..50b70c73fd24a1d63d2dc67e226fa34915586f21 100644 (file)
--- a/src/drivers/ao_sdcard.h
+++ b/src/drivers/ao_sdcard.h
@@ -69,6 +69,7 @@ ao_sdcard_init(void);
 #define SDCARD_BUSY_TIMEOUT            AO_MS_TO_TICKS(20)
 #define SDCARD_BLOCK_TIMEOUT           AO_MS_TO_TICKS(200)
 #define SDCARD_IDLE_RETRY              10
+#define SDCARD_OP_COND_RETRY           10
 
 enum ao_sdtype {
        ao_sdtype_unknown,