diff options
Diffstat (limited to 'arch/arm/mach-msm/dma.c')
| -rw-r--r-- | arch/arm/mach-msm/dma.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/arm/mach-msm/dma.c b/arch/arm/mach-msm/dma.c index 09c0c0f9729b..e80cad468925 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 @@ enum { }; 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 @@ void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd) 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 @@ void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd) 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 @@ static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id) 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 @@ static int __init msm_init_datamover(void) { 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; |