diff options
Diffstat (limited to 'patches.tizen/0771-mmc-dw-mmc-check-whether-card-is-busy-or-not-before-.patch')
| -rw-r--r-- | patches.tizen/0771-mmc-dw-mmc-check-whether-card-is-busy-or-not-before-.patch | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/patches.tizen/0771-mmc-dw-mmc-check-whether-card-is-busy-or-not-before-.patch b/patches.tizen/0771-mmc-dw-mmc-check-whether-card-is-busy-or-not-before-.patch new file mode 100644 index 00000000000..bb28cca025c --- /dev/null +++ b/patches.tizen/0771-mmc-dw-mmc-check-whether-card-is-busy-or-not-before-.patch @@ -0,0 +1,82 @@ +From e07f849566a05d85e31b69fa00cf0cf0f407316b Mon Sep 17 00:00:00 2001 +From: Jaehoon Chung <jh80.chung@samsung.com> +Date: Tue, 10 Sep 2013 17:43:03 +0900 +Subject: [PATCH 0771/1302] mmc: dw-mmc: check whether card is busy or not, + before clock disabled. + +Before disable the clock, must check whether card is busy or not. +(Refer to DesignWare TRM) + +Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> +Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> +--- + drivers/mmc/host/dw_mmc.c | 39 +++++++++++++++++++++++++++++++++++++++ + 1 file changed, 39 insertions(+) + +diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c +index 564c9fb..c6deb2b 100644 +--- a/drivers/mmc/host/dw_mmc.c ++++ b/drivers/mmc/host/dw_mmc.c +@@ -310,6 +310,27 @@ static void dw_mci_stop_dma(struct dw_mci *host) + } + } + ++static bool dw_mci_wait_reset(struct device *dev, struct dw_mci *host, ++ unsigned int reset_val) ++{ ++ unsigned long timeout = jiffies + msecs_to_jiffies(500); ++ unsigned int ctrl; ++ ++ ctrl = mci_readl(host, CTRL); ++ ctrl |= reset_val; ++ mci_writel(host, CTRL, ctrl); ++ ++ /* wait till resets clear */ ++ do { ++ if (!(mci_readl(host, CTRL) & reset_val)) ++ return true; ++ } while (time_before(jiffies, timeout)); ++ ++ dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl); ++ ++ return false; ++} ++ + static int dw_mci_get_dma_dir(struct mmc_data *data) + { + if (data->flags & MMC_DATA_WRITE) +@@ -634,6 +655,7 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit) + struct dw_mci *host = slot->host; + u32 div; + u32 clk_en_a; ++ int timeout = 1000; + + if (slot->clock != host->current_speed || force_clkinit) { + div = host->bus_hz / slot->clock; +@@ -651,6 +673,23 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit) + " div = %d)\n", slot->id, host->bus_hz, slot->clock, + div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div); + ++ /* ++ * Before disable the clock, ++ * must check whether the card is busy or not. ++ */ ++ do { ++ if (!(mci_readl(host, STATUS) & BIT(9))) ++ break; ++ if (timeout-- < 0) { ++ dev_err(host->dev, "Can't disable clock" ++ "because Card is busy!!\n"); ++ return; ++ } ++ host->cur_slot = slot; ++ dw_mci_wait_reset(host->dev, host, SDMMC_CTRL_RESET); ++ ++ } while (1); ++ + /* disable clock */ + mci_writel(host, CLKENA, 0); + mci_writel(host, CLKSRC, 0); +-- +1.8.3.2 + |