mmc: tmio: support aggressive clock gating
Guennadi Liakhovetski [Wed, 9 Mar 2011 13:45:44 +0000 (14:45 +0100)]
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>

drivers/mmc/host/tmio_mmc_pio.c

index 69772ab..e35e179 100644 (file)
@@ -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) {