[MMC] sdhci: support controller specific quirks

As some specific controllers will have bugs, we need a way to map special
behaviour to certain hardware.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 9 insertions, 0 deletions

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 315ab49e4b2..27f81e61419 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -30,6 +30,7 @@
 
 static unsigned int debug_nodma = 0;
 static unsigned int debug_forcedma = 0;
+static unsigned int debug_quirks = 0;
 
 static const struct pci_device_id pci_ids[] __devinitdata = {
         /* handle any SD host controller */
@@ -1373,6 +1374,10 @@ static int __devinit sdhci_probe(struct pci_dev *pdev,
         }
 
         chip->pdev = pdev;
+        chip->quirks = ent->driver_data;
+
+        if (debug_quirks)
+                chip->quirks = debug_quirks;
 
         chip->num_slots = slots;
         pci_set_drvdata(pdev, chip);
@@ -1453,6 +1458,7 @@ module_exit(sdhci_drv_exit);
 
 module_param(debug_nodma, uint, 0444);
 module_param(debug_forcedma, uint, 0444);
+module_param(debug_quirks, uint, 0444);
 
 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
 MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
@@ -1461,3 +1467,4 @@ MODULE_LICENSE("GPL");
 
 MODULE_PARM_DESC(debug_nodma, "Forcefully disable DMA transfers. (default 0)");
 MODULE_PARM_DESC(debug_forcedma, "Forcefully enable DMA transfers. (default 0)");
+MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
diff --git a/drivers/mmc/sdhci.h b/drivers/mmc/sdhci.h
index 8111fa38c05..f2453343f78 100644
--- a/drivers/mmc/sdhci.h
+++ b/drivers/mmc/sdhci.h
@@ -204,6 +204,8 @@ struct sdhci_host {
 struct sdhci_chip {
         struct pci_dev          *pdev;
 
+        unsigned long           quirks;
+
         int                     num_slots;      /* Slots on controller */
         struct sdhci_host       *hosts[0];      /* Pointers to hosts */
 };