This is a note to let you know that I've just added the patch titled
dmaengine: edma: Remove dynamic TPTC power management feature
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dmaengine-edma-remove-dynamic-tptc-power-management-feature.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 23f49fd2ea9bc8e1c8cff0126cd71b071ea9e91f Mon Sep 17 00:00:00 2001
From: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
Date: Wed, 6 Apr 2016 13:01:46 +0300
Subject: dmaengine: edma: Remove dynamic TPTC power management feature
From: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
commit 23f49fd2ea9bc8e1c8cff0126cd71b071ea9e91f upstream.
The dynamic or on demand pm_runtime does not work correctly on am335x and
am437x due to interference with hwmod.
Fall back using the pm_runtime usage as it was in the old driver stack,
meaning that at probe time call pm_runtime_enable() and
pm_runtime_get_sync() for the TPTCs as well.
Fixes: 1be5336bc7ba ("dmaengine: edma: New device tree binding")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
Reported-by: Tero Kristo <t-kristo@xxxxxx>
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dma/edma.c | 38 +++-----------------------------------
1 file changed, 3 insertions(+), 35 deletions(-)
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -1563,32 +1563,6 @@ static irqreturn_t dma_ccerr_handler(int
return IRQ_HANDLED;
}
-static void edma_tc_set_pm_state(struct edma_tc *tc, bool enable)
-{
- struct platform_device *tc_pdev;
- int ret;
-
- if (!IS_ENABLED(CONFIG_OF) || !tc)
- return;
-
- tc_pdev = of_find_device_by_node(tc->node);
- if (!tc_pdev) {
- pr_err("%s: TPTC device is not found\n", __func__);
- return;
- }
- if (!pm_runtime_enabled(&tc_pdev->dev))
- pm_runtime_enable(&tc_pdev->dev);
-
- if (enable)
- ret = pm_runtime_get_sync(&tc_pdev->dev);
- else
- ret = pm_runtime_put_sync(&tc_pdev->dev);
-
- if (ret < 0)
- pr_err("%s: pm_runtime_%s_sync() failed for %s\n", __func__,
- enable ? "get" : "put", dev_name(&tc_pdev->dev));
-}
-
/* Alloc channel resources */
static int edma_alloc_chan_resources(struct dma_chan *chan)
{
@@ -1625,8 +1599,6 @@ static int edma_alloc_chan_resources(str
EDMA_CHAN_SLOT(echan->ch_num), chan->chan_id,
echan->hw_triggered ? "HW" : "SW");
- edma_tc_set_pm_state(echan->tc, true);
-
return 0;
err_slot:
@@ -1663,7 +1635,6 @@ static void edma_free_chan_resources(str
echan->alloced = false;
}
- edma_tc_set_pm_state(echan->tc, false);
echan->tc = NULL;
echan->hw_triggered = false;
@@ -2408,10 +2379,8 @@ static int edma_pm_suspend(struct device
int i;
for (i = 0; i < ecc->num_channels; i++) {
- if (echan[i].alloced) {
+ if (echan[i].alloced)
edma_setup_interrupt(&echan[i], false);
- edma_tc_set_pm_state(echan[i].tc, false);
- }
}
return 0;
@@ -2441,8 +2410,6 @@ static int edma_pm_resume(struct device
/* Set up channel -> slot mapping for the entry slot */
edma_set_chmap(&echan[i], echan[i].slot[0]);
-
- edma_tc_set_pm_state(echan[i].tc, true);
}
}
@@ -2466,7 +2433,8 @@ static struct platform_driver edma_drive
static int edma_tptc_probe(struct platform_device *pdev)
{
- return 0;
+ pm_runtime_enable(&pdev->dev);
+ return pm_runtime_get_sync(&pdev->dev);
}
static struct platform_driver edma_tptc_driver = {
Patches currently in stable-queue which might be from peter.ujfalusi@xxxxxx are
queue-4.5/arm-dts-am43xx-fix-edma-memcpy-channel-allocation.patch
queue-4.5/dmaengine-edma-remove-dynamic-tptc-power-management-feature.patch
queue-4.5/dmaengine-omap-dma-fix-polled-channel-completion-detection-and-handling.patch
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