[PATCH V3 1/2] dmaengine: qcom_hidma: introduce memset support

[PATCH V3 1/2] dmaengine: qcom_hidma: introduce memset support

[Sinan Kaya]

HIDMA HW supports memset operation in addition to memcpy.
Since the memset API is present on the kernel now, bring the
memset feature into life.

The descriptor format is the same for both memcpy and memset.
Type of the descriptor is 4 when memset is requested.
The lowest 8 bits of the source DMA argument is used as a
fill pattern.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/dma/qcom/hidma.c    | 37 ++++++++++++++++++++++++++++++++++++-
 drivers/dma/qcom/hidma.h    |  7 ++++++-
 drivers/dma/qcom/hidma_ll.c | 11 ++++-------
 3 files changed, 46 insertions(+), 9 deletions(-)

diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c
index 8ed29bd..e185872 100644
--- a/drivers/dma/qcom/hidma.c
+++ b/drivers/dma/qcom/hidma.c
@@ -410,7 +410,40 @@ static int hidma_alloc_chan_resources(struct dma_chan *dmach)
 		return NULL;
 
 	hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
-				     src, dest, len, flags);
+				     src, dest, len, flags,
+				     HIDMA_TRE_MEMCPY);
+
+	/* Place descriptor in prepared list */
+	spin_lock_irqsave(&mchan->lock, irqflags);
+	list_add_tail(&mdesc->node, &mchan->prepared);
+	spin_unlock_irqrestore(&mchan->lock, irqflags);
+
+	return &mdesc->desc;
+}
+
+static struct dma_async_tx_descriptor *
+hidma_prep_dma_memset(struct dma_chan *dmach, dma_addr_t dest, int value,
+		size_t len, unsigned long flags)
+{
+	struct hidma_chan *mchan = to_hidma_chan(dmach);
+	struct hidma_desc *mdesc = NULL;
+	struct hidma_dev *mdma = mchan->dmadev;
+	unsigned long irqflags;
+
+	/* Get free descriptor */
+	spin_lock_irqsave(&mchan->lock, irqflags);
+	if (!list_empty(&mchan->free)) {
+		mdesc = list_first_entry(&mchan->free, struct hidma_desc, node);
+		list_del(&mdesc->node);
+	}
+	spin_unlock_irqrestore(&mchan->lock, irqflags);
+
+	if (!mdesc)
+		return NULL;
+
+	hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
+				     value, dest, len, flags,
+				     HIDMA_TRE_MEMSET);
 
 	/* Place descriptor in prepared list */
 	spin_lock_irqsave(&mchan->lock, irqflags);
@@ -775,6 +808,7 @@ static int hidma_probe(struct platform_device *pdev)
 	pm_runtime_get_sync(dmadev->ddev.dev);
 
 	dma_cap_set(DMA_MEMCPY, dmadev->ddev.cap_mask);
+	dma_cap_set(DMA_MEMSET, dmadev->ddev.cap_mask);
 	if (WARN_ON(!pdev->dev.dma_mask)) {
 		rc = -ENXIO;
 		goto dmafree;
@@ -785,6 +819,7 @@ static int hidma_probe(struct platform_device *pdev)
 	dmadev->dev_trca = trca;
 	dmadev->trca_resource = trca_resource;
 	dmadev->ddev.device_prep_dma_memcpy = hidma_prep_dma_memcpy;
+	dmadev->ddev.device_prep_dma_memset = hidma_prep_dma_memset;
 	dmadev->ddev.device_alloc_chan_resources = hidma_alloc_chan_resources;
 	dmadev->ddev.device_free_chan_resources = hidma_free_chan_resources;
 	dmadev->ddev.device_tx_status = hidma_tx_status;
diff --git a/drivers/dma/qcom/hidma.h b/drivers/dma/qcom/hidma.h
index 41e0aa2..5f9966e 100644
--- a/drivers/dma/qcom/hidma.h
+++ b/drivers/dma/qcom/hidma.h
@@ -28,6 +28,11 @@
 #define HIDMA_TRE_DEST_LOW_IDX		4
 #define HIDMA_TRE_DEST_HI_IDX		5
 
+enum tre_type {
+	HIDMA_TRE_MEMCPY = 3,
+	HIDMA_TRE_MEMSET = 4,
+};
+
 struct hidma_tre {
 	atomic_t allocated;		/* if this channel is allocated	    */
 	bool queued;			/* flag whether this is pending     */
@@ -150,7 +155,7 @@ int hidma_ll_request(struct hidma_lldev *llhndl, u32 dev_id,
 int hidma_ll_disable(struct hidma_lldev *lldev);
 int hidma_ll_enable(struct hidma_lldev *llhndl);
 void hidma_ll_set_transfer_params(struct hidma_lldev *llhndl, u32 tre_ch,
-	dma_addr_t src, dma_addr_t dest, u32 len, u32 flags);
+	dma_addr_t src, dma_addr_t dest, u32 len, u32 flags, u32 txntype);
 void hidma_ll_setup_irq(struct hidma_lldev *lldev, bool msi);
 int hidma_ll_setup(struct hidma_lldev *lldev);
 struct hidma_lldev *hidma_ll_init(struct device *dev, u32 max_channels,
diff --git a/drivers/dma/qcom/hidma_ll.c b/drivers/dma/qcom/hidma_ll.c
index 1530a66..4999e26 100644
--- a/drivers/dma/qcom/hidma_ll.c
+++ b/drivers/dma/qcom/hidma_ll.c
@@ -105,10 +105,6 @@ enum ch_state {
 	HIDMA_CH_STOPPED = 4,
 };
 
-enum tre_type {
-	HIDMA_TRE_MEMCPY = 3,
-};
-
 enum err_code {
 	HIDMA_EVRE_STATUS_COMPLETE = 1,
 	HIDMA_EVRE_STATUS_ERROR = 4,
@@ -174,8 +170,7 @@ int hidma_ll_request(struct hidma_lldev *lldev, u32 sig, const char *dev_name,
 	tre->err_info = 0;
 	tre->lldev = lldev;
 	tre_local = &tre->tre_local[0];
-	tre_local[HIDMA_TRE_CFG_IDX] = HIDMA_TRE_MEMCPY;
-	tre_local[HIDMA_TRE_CFG_IDX] |= (lldev->chidx & 0xFF) << 8;
+	tre_local[HIDMA_TRE_CFG_IDX] = (lldev->chidx & 0xFF) << 8;
 	tre_local[HIDMA_TRE_CFG_IDX] |= BIT(16);	/* set IEOB */
 	*tre_ch = i;
 	if (callback)
@@ -607,7 +602,7 @@ int hidma_ll_disable(struct hidma_lldev *lldev)
 
 void hidma_ll_set_transfer_params(struct hidma_lldev *lldev, u32 tre_ch,
 				  dma_addr_t src, dma_addr_t dest, u32 len,
-				  u32 flags)
+				  u32 flags, u32 txntype)
 {
 	struct hidma_tre *tre;
 	u32 *tre_local;
@@ -626,6 +621,8 @@ void hidma_ll_set_transfer_params(struct hidma_lldev *lldev, u32 tre_ch,
 	}
 
 	tre_local = &tre->tre_local[0];
+	tre_local[HIDMA_TRE_CFG_IDX] &= ~GENMASK(7, 0);
+	tre_local[HIDMA_TRE_CFG_IDX] |= txntype;
 	tre_local[HIDMA_TRE_LEN_IDX] = len;
 	tre_local[HIDMA_TRE_SRC_LOW_IDX] = lower_32_bits(src);
 	tre_local[HIDMA_TRE_SRC_HI_IDX] = upper_32_bits(src);
-- 
1.9.1

[PATCH V3 2/2] dmaengine: dmatest: add support for memset test

[Sinan Kaya]

Introducing memset test into dmatest. This change allows us to test
memset capable HW using the dmatest test procedure. The new dmatest
value for memset is 2 and it is not the default value.

Memset support patch shares the same code path as the other dmatest
code to reuse as much as we can.

The first value inside the source buffer is used as a pattern
to fill in the destination buffer space.

Prior to running the test, source/destination buffers are initialized
in the current code.

"The remaining bits are the inverse of a counter which increments by
 one for each byte address."

Memset test will fill in the upper bits of pattern with the inverse of
fixed counter value 1 as opposed to an incrementing value in a loop.

An example run is as follows:

echo dma0chan0 > /sys/module/dmatest/parameters/channel
echo 2 >  /sys/module/dmatest/parameters/dmatest
echo 2000 >  /sys/module/dmatest/parameters/timeout
echo 10 >  /sys/module/dmatest/parameters/iterations
echo 1 >  /sys/module/dmatest/parameters/run

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/dma/dmatest.c | 88 +++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 64 insertions(+), 24 deletions(-)

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index a07ef3d..35cb83b 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -60,7 +60,7 @@
 static unsigned int dmatest;
 module_param(dmatest, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(dmatest,
-		"dmatest 0-memcpy 1-slave_sg (default: 0)");
+		"dmatest 0-memcpy 1-slave_sg 2-memset (default: 0)");
 
 static unsigned int xor_sources = 3;
 module_param(xor_sources, uint, S_IRUGO | S_IWUSR);
@@ -158,6 +158,7 @@ struct dmatest_params {
 #define PATTERN_COPY		0x40
 #define PATTERN_OVERWRITE	0x20
 #define PATTERN_COUNT_MASK	0x1f
+#define PATTERN_MEMSET_IDX	0x01
 
 struct dmatest_thread {
 	struct list_head	node;
@@ -239,46 +240,62 @@ static unsigned long dmatest_random(void)
 	return buf;
 }
 
+static inline u8 gen_inv_idx(u8 index, bool is_memset)
+{
+	u8 val = is_memset ? PATTERN_MEMSET_IDX : index;
+
+	return ~val & PATTERN_COUNT_MASK;
+}
+
+static inline u8 gen_src_value(u8 index, bool is_memset)
+{
+	return PATTERN_SRC | gen_inv_idx(index, is_memset);
+}
+
+static inline u8 gen_dst_value(u8 index, bool is_memset)
+{
+	return PATTERN_DST | gen_inv_idx(index, is_memset);
+}
+
 static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
-		unsigned int buf_size)
+		unsigned int buf_size, bool is_memset)
 {
 	unsigned int i;
 	u8 *buf;
 
 	for (; (buf = *bufs); bufs++) {
 		for (i = 0; i < start; i++)
-			buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
+			buf[i] = gen_src_value(i, is_memset);
 		for ( ; i < start + len; i++)
-			buf[i] = PATTERN_SRC | PATTERN_COPY
-				| (~i & PATTERN_COUNT_MASK);
+			buf[i] = gen_src_value(i, is_memset) | PATTERN_COPY;
 		for ( ; i < buf_size; i++)
-			buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
+			buf[i] = gen_src_value(i, is_memset);
 		buf++;
 	}
 }
 
 static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
-		unsigned int buf_size)
+		unsigned int buf_size, bool is_memset)
 {
 	unsigned int i;
 	u8 *buf;
 
 	for (; (buf = *bufs); bufs++) {
 		for (i = 0; i < start; i++)
-			buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
+			buf[i] = gen_dst_value(i, is_memset);
 		for ( ; i < start + len; i++)
-			buf[i] = PATTERN_DST | PATTERN_OVERWRITE
-				| (~i & PATTERN_COUNT_MASK);
+			buf[i] = gen_dst_value(i, is_memset) |
+						PATTERN_OVERWRITE;
 		for ( ; i < buf_size; i++)
-			buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
+			buf[i] = gen_dst_value(i, is_memset);
 	}
 }
 
 static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
-		unsigned int counter, bool is_srcbuf)
+		unsigned int counter, bool is_srcbuf, bool is_memset)
 {
 	u8		diff = actual ^ pattern;
-	u8		expected = pattern | (~counter & PATTERN_COUNT_MASK);
+	u8		expected = pattern | gen_inv_idx(counter, is_memset);
 	const char	*thread_name = current->comm;
 
 	if (is_srcbuf)
@@ -298,7 +315,7 @@ static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
 
 static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
 		unsigned int end, unsigned int counter, u8 pattern,
-		bool is_srcbuf)
+		bool is_srcbuf, bool is_memset)
 {
 	unsigned int i;
 	unsigned int error_count = 0;
@@ -311,11 +328,12 @@ static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
 		counter = counter_orig;
 		for (i = start; i < end; i++) {
 			actual = buf[i];
-			expected = pattern | (~counter & PATTERN_COUNT_MASK);
+			expected = pattern | gen_inv_idx(counter, is_memset);
 			if (actual != expected) {
 				if (error_count < MAX_ERROR_COUNT)
 					dmatest_mismatch(actual, pattern, i,
-							 counter, is_srcbuf);
+							 counter, is_srcbuf,
+							 is_memset);
 				error_count++;
 			}
 			counter++;
@@ -435,6 +453,7 @@ static int dmatest_func(void *data)
 	s64			runtime = 0;
 	unsigned long long	total_len = 0;
 	u8			align = 0;
+	bool			is_memset = false;
 
 	set_freezable();
 
@@ -448,6 +467,10 @@ static int dmatest_func(void *data)
 	if (thread->type == DMA_MEMCPY) {
 		align = dev->copy_align;
 		src_cnt = dst_cnt = 1;
+	} else if (thread->type == DMA_MEMSET) {
+		align = dev->fill_align;
+		src_cnt = dst_cnt = 1;
+		is_memset = true;
 	} else if (thread->type == DMA_SG) {
 		align = dev->copy_align;
 		src_cnt = dst_cnt = sg_buffers;
@@ -571,9 +594,9 @@ static int dmatest_func(void *data)
 			dst_off = (dst_off >> align) << align;
 
 			dmatest_init_srcs(thread->srcs, src_off, len,
-					  params->buf_size);
+					  params->buf_size, is_memset);
 			dmatest_init_dsts(thread->dsts, dst_off, len,
-					  params->buf_size);
+					  params->buf_size, is_memset);
 
 			diff = ktime_sub(ktime_get(), start);
 			filltime = ktime_add(filltime, diff);
@@ -640,6 +663,11 @@ static int dmatest_func(void *data)
 			tx = dev->device_prep_dma_memcpy(chan,
 							 dsts[0] + dst_off,
 							 srcs[0], len, flags);
+		else if (thread->type == DMA_MEMSET)
+			tx = dev->device_prep_dma_memset(chan,
+						dsts[0] + dst_off,
+						*(thread->srcs[0] + src_off),
+						len, flags);
 		else if (thread->type == DMA_SG)
 			tx = dev->device_prep_dma_sg(chan, tx_sg, src_cnt,
 						     rx_sg, src_cnt, flags);
@@ -722,23 +750,25 @@ static int dmatest_func(void *data)
 		start = ktime_get();
 		pr_debug("%s: verifying source buffer...\n", current->comm);
 		error_count = dmatest_verify(thread->srcs, 0, src_off,
-				0, PATTERN_SRC, true);
+				0, PATTERN_SRC, true, is_memset);
 		error_count += dmatest_verify(thread->srcs, src_off,
 				src_off + len, src_off,
-				PATTERN_SRC | PATTERN_COPY, true);
+				PATTERN_SRC | PATTERN_COPY, true, is_memset);
 		error_count += dmatest_verify(thread->srcs, src_off + len,
 				params->buf_size, src_off + len,
-				PATTERN_SRC, true);
+				PATTERN_SRC, true, is_memset);
 
 		pr_debug("%s: verifying dest buffer...\n", current->comm);
 		error_count += dmatest_verify(thread->dsts, 0, dst_off,
-				0, PATTERN_DST, false);
+				0, PATTERN_DST, false, is_memset);
+
 		error_count += dmatest_verify(thread->dsts, dst_off,
 				dst_off + len, src_off,
-				PATTERN_SRC | PATTERN_COPY, false);
+				PATTERN_SRC | PATTERN_COPY, false, is_memset);
+
 		error_count += dmatest_verify(thread->dsts, dst_off + len,
 				params->buf_size, dst_off + len,
-				PATTERN_DST, false);
+				PATTERN_DST, false, is_memset);
 
 		diff = ktime_sub(ktime_get(), start);
 		comparetime = ktime_add(comparetime, diff);
@@ -821,6 +851,8 @@ static int dmatest_add_threads(struct dmatest_info *info,
 
 	if (type == DMA_MEMCPY)
 		op = "copy";
+	else if (type == DMA_MEMSET)
+		op = "set";
 	else if (type == DMA_SG)
 		op = "sg";
 	else if (type == DMA_XOR)
@@ -883,6 +915,13 @@ static int dmatest_add_channel(struct dmatest_info *info,
 		}
 	}
 
+	if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) {
+		if (dmatest == 2) {
+			cnt = dmatest_add_threads(info, dtc, DMA_MEMSET);
+			thread_count += cnt > 0 ? cnt : 0;
+		}
+	}
+
 	if (dma_has_cap(DMA_SG, dma_dev->cap_mask)) {
 		if (dmatest == 1) {
 			cnt = dmatest_add_threads(info, dtc, DMA_SG);
@@ -961,6 +1000,7 @@ static void run_threaded_test(struct dmatest_info *info)
 	params->noverify = noverify;
 
 	request_channels(info, DMA_MEMCPY);
+	request_channels(info, DMA_MEMSET);
 	request_channels(info, DMA_XOR);
 	request_channels(info, DMA_SG);
 	request_channels(info, DMA_PQ);
-- 
1.9.1

[PATCH V3 1/2] dmaengine: qcom_hidma: introduce memset support

[Vinod Koul]

On Thu, Jun 29, 2017 at 10:30:57PM -0400, Sinan Kaya wrote:

> @@ -410,7 +410,40 @@ static int hidma_alloc_chan_resources(struct dma_chan *dmach)
>  		return NULL;
>  
>  	hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
> -				     src, dest, len, flags);
> +				     src, dest, len, flags,
> +				     HIDMA_TRE_MEMCPY);
> +
> +	/* Place descriptor in prepared list */
> +	spin_lock_irqsave(&mchan->lock, irqflags);
> +	list_add_tail(&mdesc->node, &mchan->prepared);
> +	spin_unlock_irqrestore(&mchan->lock, irqflags);

This change looks suspicious, cna you clarify the need to do this?


-- 
~Vinod

[PATCH V3 2/2] dmaengine: dmatest: add support for memset test

[Vinod Koul]

On Thu, Jun 29, 2017 at 10:30:58PM -0400, Sinan Kaya wrote:
> Introducing memset test into dmatest. This change allows us to test
> memset capable HW using the dmatest test procedure. The new dmatest
> value for memset is 2 and it is not the default value.
> 
> Memset support patch shares the same code path as the other dmatest
> code to reuse as much as we can.
> 
> The first value inside the source buffer is used as a pattern
> to fill in the destination buffer space.
> 
> Prior to running the test, source/destination buffers are initialized
> in the current code.
> 
> "The remaining bits are the inverse of a counter which increments by
>  one for each byte address."
> 
> Memset test will fill in the upper bits of pattern with the inverse of
> fixed counter value 1 as opposed to an incrementing value in a loop.
> 
> An example run is as follows:
> 
> echo dma0chan0 > /sys/module/dmatest/parameters/channel
> echo 2 >  /sys/module/dmatest/parameters/dmatest
> echo 2000 >  /sys/module/dmatest/parameters/timeout
> echo 10 >  /sys/module/dmatest/parameters/iterations
> echo 1 >  /sys/module/dmatest/parameters/run

Applied, thanks

-- 
~Vinod

[PATCH V3 1/2] dmaengine: qcom_hidma: introduce memset support

[Sinan Kaya]

Hi Vinod,

On 7/18/2017 12:19 PM, Vinod Koul wrote:
> On Thu, Jun 29, 2017 at 10:30:57PM -0400, Sinan Kaya wrote:
> 
>> @@ -410,7 +410,40 @@ static int hidma_alloc_chan_resources(struct dma_chan *dmach)
>>  		return NULL;
>>  
>>  	hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
>> -				     src, dest, len, flags);
>> +				     src, dest, len, flags,
>> +				     HIDMA_TRE_MEMCPY);
>> +
>> +	/* Place descriptor in prepared list */
>> +	spin_lock_irqsave(&mchan->lock, irqflags);
>> +	list_add_tail(&mdesc->node, &mchan->prepared);
>> +	spin_unlock_irqrestore(&mchan->lock, irqflags);
> 
> This change looks suspicious, cna you clarify the need to do this?
> 
> 

Diff looks weird for some reason. I noticed that too.

I just added HIDMA_TRE_MEMCPY parameter to hidma_ll_set_transfer_params() function call
from hidma_prep_dma_memcpy() and created a new hidma_prep_dma_memset() function very
similar to memcpy with HIDMA_TRE_MEMSET call difference.

My suggestion is to use kdiff or another visual tool to look at the change.

Sinan
-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.

[PATCH V3 1/2] dmaengine: qcom_hidma: introduce memset support

[Vinod Koul]

On Tue, Jul 18, 2017 at 12:26:14PM -0400, Sinan Kaya wrote:
> Hi Vinod,
> 
> On 7/18/2017 12:19 PM, Vinod Koul wrote:
> > On Thu, Jun 29, 2017 at 10:30:57PM -0400, Sinan Kaya wrote:
> > 
> >> @@ -410,7 +410,40 @@ static int hidma_alloc_chan_resources(struct dma_chan *dmach)
> >>  		return NULL;
> >>  
> >>  	hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
> >> -				     src, dest, len, flags);
> >> +				     src, dest, len, flags,
> >> +				     HIDMA_TRE_MEMCPY);
> >> +
> >> +	/* Place descriptor in prepared list */
> >> +	spin_lock_irqsave(&mchan->lock, irqflags);
> >> +	list_add_tail(&mdesc->node, &mchan->prepared);
> >> +	spin_unlock_irqrestore(&mchan->lock, irqflags);
> > 
> > This change looks suspicious, cna you clarify the need to do this?
> > 
> > 
> 
> Diff looks weird for some reason. I noticed that too.
> 
> I just added HIDMA_TRE_MEMCPY parameter to hidma_ll_set_transfer_params() function call
> from hidma_prep_dma_memcpy() and created a new hidma_prep_dma_memset() function very
> similar to memcpy with HIDMA_TRE_MEMSET call difference.
> 
> My suggestion is to use kdiff or another visual tool to look at the change.

ah fine then, let me take a look at it again with rested pair of eyes in the
morn :)

-- 
~Vinod

[PATCH V3 1/2] dmaengine: qcom_hidma: introduce memset support

[Vinod Koul]

On Tue, Jul 18, 2017 at 10:17:06PM +0530, Vinod Koul wrote:
> On Tue, Jul 18, 2017 at 12:26:14PM -0400, Sinan Kaya wrote:
> > Hi Vinod,
> > 
> > On 7/18/2017 12:19 PM, Vinod Koul wrote:
> > > On Thu, Jun 29, 2017 at 10:30:57PM -0400, Sinan Kaya wrote:
> > > 
> > >> @@ -410,7 +410,40 @@ static int hidma_alloc_chan_resources(struct dma_chan *dmach)
> > >>  		return NULL;
> > >>  
> > >>  	hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
> > >> -				     src, dest, len, flags);
> > >> +				     src, dest, len, flags,
> > >> +				     HIDMA_TRE_MEMCPY);
> > >> +
> > >> +	/* Place descriptor in prepared list */
> > >> +	spin_lock_irqsave(&mchan->lock, irqflags);
> > >> +	list_add_tail(&mdesc->node, &mchan->prepared);
> > >> +	spin_unlock_irqrestore(&mchan->lock, irqflags);
> > > 
> > > This change looks suspicious, cna you clarify the need to do this?
> > > 
> > > 
> > 
> > Diff looks weird for some reason. I noticed that too.
> > 
> > I just added HIDMA_TRE_MEMCPY parameter to hidma_ll_set_transfer_params() function call
> > from hidma_prep_dma_memcpy() and created a new hidma_prep_dma_memset() function very
> > similar to memcpy with HIDMA_TRE_MEMSET call difference.
> > 
> > My suggestion is to use kdiff or another visual tool to look at the change.
> 
> ah fine then, let me take a look at it again with rested pair of eyes in the
> morn :)

Checked the context is fine, so

Applied, thanks

-- 
~Vinod