This RFC patch is applied checking card busy with status register.
In Status register, bit[9] indicate the card busy or not.
So, if we use this bit in status register, we can check the card busy or not.
Maybe, didn't increased the performance, but i think this approach is decreased
the CPU usage.
Anyone, let me know how think about this patch.
Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/mmc/host/dw_mmc.c | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 87e1f57..882d004 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -647,9 +647,26 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct dw_mci_slot *slot = mmc_priv(mmc);
struct dw_mci *host = slot->host;
+ unsigned int timeout = 0x100;
WARN_ON(slot->mrq);
+ while (timeout) {
+ if ((mrq->data && (mrq->data->flags == MMC_DATA_READ)) ||
+ !(mci_readl(host, STATUS) & (1 << 9)))
+ break;
+
+ if (timeout == 0) {
+ dev_err(&host->pdev->dev, "Card is busy!!\n");
+ return;
+ }
+
+ if (!need_resched())
+ usleep_range(10, 50);
+
+ timeout--;
+ }
+
if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
mrq->cmd->error = -ENOMEDIUM;
mmc_request_done(mmc, mrq);
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