OMAP2/3/4: DMA: disable channel interrupts in omap_init_dma()

If we are softbooting another kernel using kexec, DMA controller state is not
known when we are performing omap_init_dma(). It is possible that some DMA
channels are already active. For example after kexec we get:

<4>IRQ 0020 for non-allocated DMAchannel 5
<4>IRQ 0020 for non-allocated DMAchannel 5
<4>IRQ 0020 for non-allocated DMAchannel 5
<4>IRQ 0020 for non-allocated DMAchannel 5
<4>IRQ 0020 for non-allocated DMAchannel 5

To prevent any weird things happening, we disable all channel interrupts during
init.

Signed-off-by: Mika Westerberg <ext-mika.1.westerberg@nokia.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 1d95996..ad42ec3 100644 (file)
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -709,6 +709,21 @@ static inline void omap2_enable_irq_lch(int lch)
        spin_unlock_irqrestore(&dma_chan_lock, flags);
 }
 
+static inline void omap2_disable_irq_lch(int lch)
+{
+       u32 val;
+       unsigned long flags;
+
+       if (!cpu_class_is_omap2())
+               return;
+
+       spin_lock_irqsave(&dma_chan_lock, flags);
+       val = dma_read(IRQENABLE_L0);
+       val &= ~(1 << lch);
+       dma_write(val, IRQENABLE_L0);
+       spin_unlock_irqrestore(&dma_chan_lock, flags);
+}
+
 int omap_request_dma(int dev_id, const char *dev_name,
                     void (*callback)(int lch, u16 ch_status, void *data),
                     void *data, int *dma_ch_out)
@@ -807,14 +822,7 @@ void omap_free_dma(int lch)
        }
 
        if (cpu_class_is_omap2()) {
-               u32 val;
-
-               spin_lock_irqsave(&dma_chan_lock, flags);
-               /* Disable interrupts */
-               val = dma_read(IRQENABLE_L0);
-               val &= ~(1 << lch);
-               dma_write(val, IRQENABLE_L0);
-               spin_unlock_irqrestore(&dma_chan_lock, flags);
+               omap2_disable_irq_lch(lch);
 
                /* Clear the CSR register and IRQ status register */
                dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
@@ -2107,6 +2115,9 @@ static int __init omap_init_dma(void)
 
        for (ch = 0; ch < dma_chan_count; ch++) {
                omap_clear_dma(ch);
+               if (cpu_class_is_omap2())
+                       omap2_disable_irq_lch(ch);
+
                dma_chan[ch].dev_id = -1;
                dma_chan[ch].next_lch = -1;