mmc: dw_mmc: Honor requests to set the clock to 0

Previously the dw_mmc driver would ignore any requests to disable the
card's clock.  This doesn't seem like a good thing in general, but had
one extra bad side effect in the following situation:
* mmc core would set clk to 400kHz at boot time while scanning
* mmc core would set clk to 0 since no card, but it would be ignored.
* suspend to ram and resume; clocks in the dw_mmc IP block are now 0
  but dw_mmc thinks that they're 400kHz (it ignored the set to 0).
* insert card
* mmc core would set clk to 400kHz which would be considered a no-op.

Note that if there is no card in the slot and we do a suspend/resume
cycle, we _do_ still end up with differences in a dw_mmc register
dump, but the differences are clock related and we've got the clock
disabled both before and after, so this should be OK.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 7192f89..bc3a430 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -88,6 +88,9 @@ struct idmac_desc {
  * @queue_node: List node for placing this node in the @queue list of
  *     &struct dw_mci.
  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
+ * @__clk_old: The last updated clock with reflecting clock divider.
+ *     Keeping track of this helps us to avoid spamming the console
+ *     with CONFIG_MMC_CLKGATE.
  * @flags: Random state bits associated with the slot.
  * @id: Number of this slot.
  * @last_detect_state: Most recently observed card detect state.
@@ -105,6 +108,7 @@ struct dw_mci_slot {
        struct list_head        queue_node;
 
        unsigned int            clock;
+       unsigned int            __clk_old;
        unsigned long           flags;
 #define DW_MMC_CARD_PRESENT    0
 #define DW_MMC_CARD_NEED_INIT  1
@@ -632,24 +636,31 @@ static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
 {
        struct dw_mci *host = slot->host;
+       unsigned int clock = slot->clock;
        u32 div;
        u32 clk_en_a;
 
-       if (slot->clock != host->current_speed || force_clkinit) {
-               div = host->bus_hz / slot->clock;
-               if (host->bus_hz % slot->clock && host->bus_hz > slot->clock)
+       if (!clock) {
+               mci_writel(host, CLKENA, 0);
+               mci_send_cmd(slot,
+                            SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
+       } else if (clock != host->current_speed || force_clkinit) {
+               div = host->bus_hz / clock;
+               if (host->bus_hz % clock && host->bus_hz > clock)
                        /*
                         * move the + 1 after the divide to prevent
                         * over-clocking the card.
                         */
                        div += 1;
 
-               div = (host->bus_hz != slot->clock) ? DIV_ROUND_UP(div, 2) : 0;
+               div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0;
 
-               dev_info(&slot->mmc->class_dev,
-                        "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ"
-                        " div = %d)\n", slot->id, host->bus_hz, slot->clock,
-                        div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div);
+               if ((clock << div) != slot->__clk_old || force_clkinit)
+                       dev_info(&slot->mmc->class_dev,
+                                "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n",
+                                slot->id, host->bus_hz, clock,
+                                div ? ((host->bus_hz / div) >> 1) :
+                                host->bus_hz, div);
 
                /* disable clock */
                mci_writel(host, CLKENA, 0);
@@ -676,9 +687,12 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
                mci_send_cmd(slot,
                             SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
 
-               host->current_speed = slot->clock;
+               /* keep the clock with reflecting clock dividor */
+               slot->__clk_old = clock << div;
        }
 
+       host->current_speed = clock;
+
        /* Set the current slot bus width */
        mci_writel(host, CTYPE, (slot->ctype << slot->id));
 }
@@ -807,13 +821,11 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 
        mci_writel(slot->host, UHS_REG, regs);
 
-       if (ios->clock) {
-               /*
-                * Use mirror of ios->clock to prevent race with mmc
-                * core ios update when finding the minimum.
-                */
-               slot->clock = ios->clock;
-       }
+       /*
+        * Use mirror of ios->clock to prevent race with mmc
+        * core ios update when finding the minimum.
+        */
+       slot->clock = ios->clock;
 
        if (drv_data && drv_data->set_ios)
                drv_data->set_ios(slot->host, ios);