From 5fd0157901d5a8f497f3d3b95cb4beebf1641d1b Mon Sep 17 00:00:00 2001
From: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Date: Wed, 9 Mar 2011 14:45:44 +0100
Subject: [PATCH] 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>
---
drivers/mmc/host/tmio_mmc_pio.c | 17 ++++++++---------
1 file 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) {
--
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