From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Mon, 6 Jul 2020 18:07:06 +0000 (+0200)
Subject: liblitesdcard/sdcard: add timeout when waiting card to be ready.
X-Git-Tag: 24jan2021_ls180~104
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e473c6f29ef99d9ecd6cbce4d13f7a066be3c929;p=litex.git

liblitesdcard/sdcard: add timeout when waiting card to be ready.
---

diff --git a/litex/soc/software/liblitesdcard/sdcard.c b/litex/soc/software/liblitesdcard/sdcard.c
index 48959b50..440c8f61 100644
--- a/litex/soc/software/liblitesdcard/sdcard.c
+++ b/litex/soc/software/liblitesdcard/sdcard.c
@@ -448,6 +448,7 @@ void sdcard_decode_csd(void) {
 
 int sdcard_init(void) {
 	unsigned short rca;
+    uint16_t timeout;
 
 	/* initialize freq */
 	sdcard_set_clk_freq(16000000);
@@ -461,15 +462,18 @@ int sdcard_init(void) {
 	busy_wait(1);
 	sdcard_send_ext_csd();
 	/* wait for card to be ready */
-	/* FIXME: 1.8v support */
-	for(;;) {
+	timeout = 10;
+	while (timeout) {
 		sdcard_app_cmd(0);
 		sdcard_app_send_op_cond(1, 0);
 		if (sdcard_response[3] & 0x80000000) {
 			break;
 		}
 		busy_wait(1);
+		timeout--;
 	}
+	if (timeout == 0)
+		return 0;
 
 	/* send identification */
 	sdcard_all_send_cid();