On Friday 22 August 2014 01:16 PM, Dave Gerlach wrote:
> From: Daniel Mack <zon...@gmail.com>
>
> This patch makes the edma driver resume correctly after suspend. Tested
> on an AM33xx platform with cyclic audio streams and omap_hsmmc.
>
> All information can be reconstructed by already known runtime
> information.
>
> As we now use some functions that were previously only used from __init
> context, annotations had to be dropped.
>
> [n...@ti.com: added error handling for runtime + suspend_late/early_resume]
> Signed-off-by: Nishanth Menon <n...@ti.com>
> Signed-off-by: Daniel Mack <zon...@gmail.com>
> Tested-by: Joel Fernandes <jo...@ti.com>
> Acked-by: Joel Fernandes <jo...@ti.com>
> [d-gerl...@ti.com: updated to remove queue_tc_mapping use]
> Signed-off-by: Dave Gerlach <d-gerl...@ti.com>
> ---
>
> Needed for am335x suspend, but never got picked up. Previously
> sent here: http://marc.info/?l=linux-arm-kernel&m=138556067416051&w=2
>
> arch/arm/common/edma.c | 86
> ++++++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 84 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
> index 8809917..ece1e3d 100644
> --- a/arch/arm/common/edma.c
> +++ b/arch/arm/common/edma.c
> @@ -244,6 +244,8 @@ struct edma {
> /* list of channels with no even trigger; terminated by "-1" */
> const s8 *noevent;
>
> + struct edma_soc_info *info;
> +
> /* The edma_inuse bit for each PaRAM slot is clear unless the
> * channel is in use ... by ARM or DSP, for QDMA, or whatever.
> */
> @@ -295,7 +297,7 @@ static void map_dmach_queue(unsigned ctlr, unsigned ch_no,
> ~(0x7 << bit), queue_no << bit);
> }
>
> -static void __init assign_priority_to_queue(unsigned ctlr, int queue_no,
> +static void assign_priority_to_queue(unsigned ctlr, int queue_no,
> int priority)
> {
> int bit = queue_no * 4;
> @@ -314,7 +316,7 @@ static void __init assign_priority_to_queue(unsigned
> ctlr, int queue_no,
> * included in that particular EDMA variant (Eg : dm646x)
> *
> */
> -static void __init map_dmach_param(unsigned ctlr)
> +static void map_dmach_param(unsigned ctlr)
> {
> int i;
> for (i = 0; i < EDMA_MAX_DMACH; i++)
> @@ -1791,15 +1793,95 @@ static int edma_probe(struct platform_device *pdev)
> edma_write_array2(j, EDMA_DRAE, i, 1, 0x0);
> edma_write_array(j, EDMA_QRAE, i, 0x0);
> }
> + edma_cc[j]->info = info[j];
> arch_num_cc++;
> }
>
> return 0;
> }
>
> +static int edma_pm_suspend(struct device *dev)
> +{
> + int j, r;
> +
> + r = pm_runtime_get_sync(dev);
> + if (r < 0) {
> + dev_err(dev, "%s: get_sync returned %d\n", __func__, r);
> + return r;
> + }
The driver currently does a pm_runtime_get_sync() once during probe. And
does not do a put(). So this should actually be not required. In fact
looks like this additional get() call will prevent the clock from
getting disabled which is probably not what you intend.
> +
> + for (j = 0; j < arch_num_cc; j++) {
> + struct edma *ecc = edma_cc[j];
> +
> + disable_irq(ecc->irq_res_start);
> + disable_irq(ecc->irq_res_end);
Do we really need to disable these irqs?
> + }
> +
> + pm_runtime_put_sync(dev);
> +
> + return 0;
> +}
> +
> +static int edma_pm_resume(struct device *dev)
> +{
> + int i, j, r;
> +
> + r = pm_runtime_get_sync(dev);
> + if (r < 0) {
> + dev_err(dev, "%s: get_sync returned %d\n", __func__, r);
> + return r;
> + }
> +
> + for (j = 0; j < arch_num_cc; j++) {
> + struct edma *cc = edma_cc[j];
> +
> + s8 (*queue_priority_mapping)[2];
> +
> + queue_priority_mapping = cc->info->queue_priority_mapping;
> +
> + /* Event queue priority mapping */
> + for (i = 0; queue_priority_mapping[i][0] != -1; i++)
> + assign_priority_to_queue(j,
> + queue_priority_mapping[i][0],
> + queue_priority_mapping[i][1]);
> +
> + /*
> + * Map the channel to param entry if channel mapping logic
> + * exist
> + */
> + if (edma_read(j, EDMA_CCCFG) & CHMAP_EXIST)
> + map_dmach_param(j);
> +
> + for (i = 0; i < cc->num_channels; i++) {
> + if (test_bit(i, cc->edma_inuse)) {
> + /* ensure access through shadow region 0 */
> + edma_or_array2(j, EDMA_DRAE, 0, i >> 5,
> + BIT(i & 0x1f));
> +
> + setup_dma_interrupt(i,
> + cc->intr_data[i].callback,
> + cc->intr_data[i].data);
> + }
> + }
> +
> + enable_irq(cc->irq_res_start);
> + enable_irq(cc->irq_res_end);
> + }
> +
> + pm_runtime_put_sync(dev);
> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops edma_pm_ops = {
> + .suspend_late = edma_pm_suspend,
> + .resume_early = edma_pm_resume,
> +};
You can use SET_LATE_SYSTEM_SLEEP_PM_OPS() as some other DMA drivers are
doing too.
Thanks,
Sekhar
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