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Diffstat (limited to 'drivers/mtd/devices/m25p80.c')
-rw-r--r--drivers/mtd/devices/m25p80.c26
1 files changed, 14 insertions, 12 deletions
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 8185b1f3e5e6..cc6369ea67dd 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -54,7 +54,7 @@
54#define SR_SRWD 0x80 /* SR write protect */ 54#define SR_SRWD 0x80 /* SR write protect */
55 55
56/* Define max times to check status register before we give up. */ 56/* Define max times to check status register before we give up. */
57#define MAX_READY_WAIT_COUNT 100000 57#define MAX_READY_WAIT_JIFFIES (10 * HZ) /* eg. M25P128 specs 6s max sector erase */
58#define CMD_SIZE 4 58#define CMD_SIZE 4
59 59
60#ifdef CONFIG_M25PXX_USE_FAST_READ 60#ifdef CONFIG_M25PXX_USE_FAST_READ
@@ -139,20 +139,20 @@ static inline int write_enable(struct m25p *flash)
139 */ 139 */
140static int wait_till_ready(struct m25p *flash) 140static int wait_till_ready(struct m25p *flash)
141{ 141{
142 int count; 142 unsigned long deadline;
143 int sr; 143 int sr;
144 144
145 /* one chip guarantees max 5 msec wait here after page writes, 145 deadline = jiffies + MAX_READY_WAIT_JIFFIES;
146 * but potentially three seconds (!) after page erase. 146
147 */ 147 do {
148 for (count = 0; count < MAX_READY_WAIT_COUNT; count++) {
149 if ((sr = read_sr(flash)) < 0) 148 if ((sr = read_sr(flash)) < 0)
150 break; 149 break;
151 else if (!(sr & SR_WIP)) 150 else if (!(sr & SR_WIP))
152 return 0; 151 return 0;
153 152
154 /* REVISIT sometimes sleeping would be best */ 153 cond_resched();
155 } 154
155 } while (!time_after_eq(jiffies, deadline));
156 156
157 return 1; 157 return 1;
158} 158}
@@ -246,10 +246,12 @@ static int m25p80_erase(struct mtd_info *mtd, struct erase_info *instr)
246 mutex_lock(&flash->lock); 246 mutex_lock(&flash->lock);
247 247
248 /* whole-chip erase? */ 248 /* whole-chip erase? */
249 if (len == flash->mtd.size && erase_chip(flash)) { 249 if (len == flash->mtd.size) {
250 instr->state = MTD_ERASE_FAILED; 250 if (erase_chip(flash)) {
251 mutex_unlock(&flash->lock); 251 instr->state = MTD_ERASE_FAILED;
252 return -EIO; 252 mutex_unlock(&flash->lock);
253 return -EIO;
254 }
253 255
254 /* REVISIT in some cases we could speed up erasing large regions 256 /* REVISIT in some cases we could speed up erasing large regions
255 * by using OPCODE_SE instead of OPCODE_BE_4K. We may have set up 257 * by using OPCODE_SE instead of OPCODE_BE_4K. We may have set up