msm: add dsb() syncronization to datamover driver
Avoids problems on the scorpion core.
Signed-off-by: Brian Swetland <swetland@google.com>
diff --git a/arch/arm/mach-msm/dma.c b/arch/arm/mach-msm/dma.c
index e80cad4..3d725ae 100644
--- a/arch/arm/mach-msm/dma.c
+++ b/arch/arm/mach-msm/dma.c
@@ -59,6 +59,7 @@
spin_lock_irqsave(&msm_dmov_lock, irq_flags);
if (!channel_active)
clk_enable(msm_dmov_clk);
+ dsb();
status = readl(DMOV_STATUS(id));
if (list_empty(&ready_commands[id]) &&
(status & DMOV_STATUS_CMD_PTR_RDY)) {
@@ -172,6 +173,7 @@
"for %p, result %x\n", id, cmd, ch_result);
if (cmd) {
list_del(&cmd->list);
+ dsb();
cmd->complete_func(cmd, ch_result, NULL);
}
}
@@ -188,6 +190,7 @@
PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
if (cmd) {
list_del(&cmd->list);
+ dsb();
cmd->complete_func(cmd, ch_result, &errdata);
}
}
@@ -205,6 +208,7 @@
PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
if (cmd) {
list_del(&cmd->list);
+ dsb();
cmd->complete_func(cmd, ch_result, &errdata);
}
/* this does not seem to work, once we get an error */