From 34963c7f374dfc9a9b3bf7a4a5d667b87f8bebe0 Mon Sep 17 00:00:00 2001
From: Jared Boone <jboone@earfeast.com>
Date: Sat, 9 Apr 2016 21:33:46 -0700
Subject: [PATCH] SDC: Auto-off clock when no transfer.

---
 firmware/chibios-portapack/os/hal/platforms/LPC43xx/sdc_lld.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/firmware/chibios-portapack/os/hal/platforms/LPC43xx/sdc_lld.c b/firmware/chibios-portapack/os/hal/platforms/LPC43xx/sdc_lld.c
index 835abd80a..de3877c3e 100644
--- a/firmware/chibios-portapack/os/hal/platforms/LPC43xx/sdc_lld.c
+++ b/firmware/chibios-portapack/os/hal/platforms/LPC43xx/sdc_lld.c
@@ -537,6 +537,8 @@ void sdc_lld_init(void) {
 void sdc_lld_start(SDCDriver *sdcp) {
 
   if (sdcp->state == BLK_STOP) {
+    LPC_SDMMC->CLKENA = (1U << 16);   /* CCLK_LOW_POWER */
+
     LPC_CCU1->CLK_M4_SDIO_CFG.RUN = 1;
     LPC_CGU->BASE_SDIO_CLK.PD = 0;