From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 22 Feb 2005 21:48:25 +0000 (+0000)
Subject: [MTD] DiskOnChip: Wait for the command to finish.
X-Git-Tag: firefly_0821_release~42753^2~102
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=dfd61294403cce7ca2263674f420c3417093cb56;p=firefly-linux-kernel-4.4.55.git

[MTD] DiskOnChip: Wait for the command to finish.

Do not use the ready function here, as it might hang for ever.
The result will show, whether the chip is there or not

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c
index d5927674f283..a9b1da40ad32 100644
--- a/drivers/mtd/nand/diskonchip.c
+++ b/drivers/mtd/nand/diskonchip.c
@@ -16,7 +16,7 @@
  *  
  * Interface to generic NAND code for M-Systems DiskOnChip devices
  *
- * $Id: diskonchip.c,v 1.48 2005/01/31 22:22:21 gleixner Exp $
+ * $Id: diskonchip.c,v 1.49 2005/02/22 21:48:21 gleixner Exp $
  */
 
 #include <linux/kernel.h>
@@ -410,7 +410,12 @@ static uint16_t __init doc200x_ident_chip(struct mtd_info *mtd, int nr)
 	doc200x_hwcontrol(mtd, NAND_CTL_SETALE);
 	this->write_byte(mtd, 0);
 	doc200x_hwcontrol(mtd, NAND_CTL_CLRALE);
-
+	
+	/* We cant' use dev_ready here, but at least we wait for the
+	 * command to complete 
+	 */
+	udelay(50);
+	
 	ret = this->read_byte(mtd) << 8;
 	ret |= this->read_byte(mtd);
 
@@ -429,6 +434,8 @@ static uint16_t __init doc200x_ident_chip(struct mtd_info *mtd, int nr)
 		doc2000_write_byte(mtd, 0);
 		doc200x_hwcontrol(mtd, NAND_CTL_CLRALE);
 
+		udelay(50);
+
 		ident.dword = readl(docptr + DoC_2k_CDSN_IO);
 		if (((ident.byte[0] << 8) | ident.byte[1]) == ret) {
 			printk(KERN_INFO "DiskOnChip 2000 responds to DWORD access\n");