mmc: tmio: support aggressive clock gating

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 8 insertions, 9 deletions

diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index 69772ab3ca22..e35e17992e38 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -747,19 +747,18 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                 tmio_mmc_set_clock(host, ios->clock);
 
         /* Power sequence - OFF -> UP -> ON */
-        switch (ios->power_mode) {
-        case MMC_POWER_OFF: /* power down SD bus */
-                if (host->set_pwr)
+        if (ios->power_mode == MMC_POWER_OFF || !ios->clock) {
+                /* power down SD bus */
+                if (ios->power_mode == MMC_POWER_OFF && host->set_pwr)
                         host->set_pwr(host->pdev, 0);
                 tmio_mmc_clk_stop(host);
-                break;
-        case MMC_POWER_ON: /* start bus clock */
-                tmio_mmc_clk_start(host);
-                break;
-        case MMC_POWER_UP: /* power up SD bus */
+        } else if (ios->power_mode == MMC_POWER_UP) {
+                /* power up SD bus */
                 if (host->set_pwr)
                         host->set_pwr(host->pdev, 1);
-                break;
+        } else {
+                /* start bus clock */
+                tmio_mmc_clk_start(host);
         }
 
         switch (ios->bus_width) {