mmc: dw_mmc: add quirks for unreliable card detect, and capabilities

This patch adds quirks and capabilities to platdata.

Some cards don't use the CDn pin; in that case, we assume the card's
inserted. Some boards need other capabilities. So, we add capabilities
in the board's platdata.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

2 files changed, 15 insertions, 5 deletions

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 299c1d61b6b3..94ec6502bdde 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -729,7 +729,9 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
         struct dw_mci_board *brd = slot->host->pdata;
 
         /* Use platform get_cd function, else try onboard card detect */
-        if (brd->get_cd)
+        if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
+                present = 1;
+        else if (brd->get_cd)
                 present = !brd->get_cd(slot->id);
         else
                 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
@@ -1403,7 +1405,11 @@ static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
         if (host->pdata->setpower)
                 host->pdata->setpower(id, 0);
 
-        mmc->caps = 0;
+        if (host->pdata->caps)
+                mmc->caps = host->pdata->caps;
+        else
+                mmc->caps = 0;
+
         if (host->pdata->get_bus_wd)
                 if (host->pdata->get_bus_wd(slot->id) >= 4)
                         mmc->caps |= MMC_CAP_4_BIT_DATA;
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index 3f22c201ee3a..f08163198877 100644
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -166,11 +166,13 @@ struct dw_mci_dma_ops {
 
 /* IP Quirks/flags. */
 /* DTO fix for command transmission with IDMAC configured */
-#define DW_MCI_QUIRK_IDMAC_DTO          BIT(0)
+#define DW_MCI_QUIRK_IDMAC_DTO                  BIT(0)
 /* delay needed between retries on some 2.11a implementations */
-#define DW_MCI_QUIRK_RETRY_DELAY        BIT(1)
+#define DW_MCI_QUIRK_RETRY_DELAY                BIT(1)
 /* High Speed Capable - Supports HS cards (upto 50MHz) */
-#define DW_MCI_QUIRK_HIGHSPEED          BIT(2)
+#define DW_MCI_QUIRK_HIGHSPEED                  BIT(2)
+/* Unreliable card detection */
+#define DW_MCI_QUIRK_BROKEN_CARD_DETECTION      BIT(3)
 
 
 struct dma_pdata;
@@ -190,6 +192,8 @@ struct dw_mci_board {
         u32 quirks; /* Workaround / Quirk flags */
         unsigned int bus_hz; /* Bus speed */
 
+        unsigned int caps;      /* Capabilities */
+
         /* delay in mS before detecting cards after interrupt */
         u32 detect_delay_ms;