[ARM] msm: dma: Enable dma clock while dma is active
Signed-off-by: Arve Hjønnevåg <arve@android.com>
diff --git a/arch/arm/mach-msm/dma.c b/arch/arm/mach-msm/dma.c
index 09c0c0f..e80cad4 100644
--- a/arch/arm/mach-msm/dma.c
+++ b/arch/arm/mach-msm/dma.c
@@ -13,6 +13,8 @@
*
*/
+#include <linux/clk.h>
+#include <linux/err.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <mach/dma.h>
@@ -26,6 +28,7 @@
};
static DEFINE_SPINLOCK(msm_dmov_lock);
+static struct clk *msm_dmov_clk;
static unsigned int channel_active;
static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
@@ -54,6 +57,8 @@
unsigned int status;
spin_lock_irqsave(&msm_dmov_lock, irq_flags);
+ if (!channel_active)
+ clk_enable(msm_dmov_clk);
status = readl(DMOV_STATUS(id));
if (list_empty(&ready_commands[id]) &&
(status & DMOV_STATUS_CMD_PTR_RDY)) {
@@ -70,6 +75,8 @@
channel_active |= 1U << id;
writel(cmd->cmdptr, DMOV_CMD_PTR(id));
} else {
+ if (!channel_active)
+ clk_disable(msm_dmov_clk);
if (list_empty(&active_commands[id]))
PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
@@ -219,8 +226,10 @@
PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
}
- if (!channel_active)
+ if (!channel_active) {
disable_irq_nosync(INT_ADM_AARM);
+ clk_disable(msm_dmov_clk);
+ }
spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
return IRQ_HANDLED;
@@ -230,11 +239,17 @@
{
int i;
int ret;
+ struct clk *clk;
+
for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
INIT_LIST_HEAD(&ready_commands[i]);
INIT_LIST_HEAD(&active_commands[i]);
writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
}
+ clk = clk_get(NULL, "adm_clk");
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+ msm_dmov_clk = clk;
ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
if (ret)
return ret;