[PATCH 4/6] MCI/Core: honor transmission limits at the card's side

[Juergen Beisert]

The host limits are only one limit we must honor when changing the transmission frequency.
The SD cards have their own limits, so take them also into account.

Signed-off-by: Juergen Beisert <jbe at pengutronix.de>
---
 drivers/mci/mci-core.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index 9aeaa4d..42e3d4b 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -605,13 +605,17 @@ static void mci_set_clock(struct mci *mci, unsigned clock)
 {
 	struct mci_host *host = mci->host;
 
-	/* check against any given limits */
+	/* check against any given limits at the host's side */
 	if (clock > host->f_max)
 		clock = host->f_max;
 
 	if (clock < host->f_min)
 		clock = host->f_min;
 
+	/* check against the limit at the card's side */
+	if (mci->tran_speed != 0 && clock > mci->tran_speed)
+		clock = mci->tran_speed;
+
 	host->clock = clock;	/* the new target frequency */
 	mci_set_ios(mci);
 }
-- 
1.8.2.rc2