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Fix error with PMP cards not reading correctly on boot #199

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Fix error with PMP cards not reading correctly on boot #199

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e86e8a0
Added delay to PMP read
Aug 17, 2015
dc59fe7
Update libata.h
Aug 17, 2015
ff2803c
Merge pull request #1 from mackeyja92/patch-2
Aug 17, 2015
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15 changes: 14 additions & 1 deletion drivers/ata/libata-pmp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -145,12 +145,23 @@ int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)

if (reg > SATA_PMP_PSCR_CONTROL)
return -EINVAL;

/* For some PMP cards, we need to delay some time */
if (link>flags & ATA_LFLAG_DELAY) {
set_current_state(TASK_INTERRUPTIBLE);
/* sleep 50 msecond */
schedule_timeout(msecs_to_jiffies(50));
}

err_mask = sata_pmp_read(link, reg, r_val);
if (err_mask) {
ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n",
reg, err_mask);
return -EIO;
} else if (vendor== 0x197b && devid == 0x0325) {
ata_for_each_link(link, ap, EDGE) {
link->flags |= ATA_LFLAG_DELAY;
}
}
return 0;
}
Expand All @@ -176,13 +187,15 @@ int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)

if (reg > SATA_PMP_PSCR_CONTROL)
return -EINVAL;



err_mask = sata_pmp_write(link, reg, val);
if (err_mask) {
ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n",
reg, err_mask);
return -EIO;
}
}
return 0;
}

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1 change: 1 addition & 0 deletions include/linux/libata.h
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Original file line number Diff line number Diff line change
Expand Up @@ -205,6 +205,7 @@ enum {
ATA_LFLAG_NO_LPM = (1 << 8), /* disable LPM on this link */
ATA_LFLAG_RST_ONCE = (1 << 9), /* limit recovery to one reset */
ATA_LFLAG_CHANGED = (1 << 10), /* LPM state changed on this link */
ATA_LFLAG_DELAY = (1 << 9), /* Delay some time for PMP */

/* struct ata_port flags */
ATA_FLAG_SLAVE_POSS = (1 << 0), /* host supports slave dev */
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