This is a note to let you know that I've just added the patch titled
dmaengine: stm32-mdma: use Link Address Register to compute residue
to the 6.5-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-stm32-mdma-use-link-address-register-to-compute-residue.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a4b306eb83579c07b63dc65cd5bae53b7b4019d0 Mon Sep 17 00:00:00 2001
From: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
Date: Wed, 4 Oct 2023 18:35:29 +0200
Subject: dmaengine: stm32-mdma: use Link Address Register to compute residue
From: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
commit a4b306eb83579c07b63dc65cd5bae53b7b4019d0 upstream.
Current implementation relies on curr_hwdesc index. But to keep this index
up to date, Block Transfer interrupt (BTIE) has to be enabled.
If it is not, curr_hwdesc is not updated, and then residue is not reliable.
Rely on Link Address Register instead. And disable BTIE interrupt
in stm32_mdma_setup_xfer() because it is no more needed in case of
_prep_slave_sg() to maintain curr_hwdesc up to date.
It avoids extra interrupts and also ensures a reliable residue. These
improvements are required for STM32 DCMI camera capture use case, which
need STM32 DMA and MDMA chaining for good performance.
Fixes: 696874322771 ("dmaengine: stm32-mdma: add support to be triggered by STM32 DMA")
Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20231004163531.2864160-2-amelie.delaunay@xxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dma/stm32-mdma.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
--- a/drivers/dma/stm32-mdma.c
+++ b/drivers/dma/stm32-mdma.c
@@ -778,8 +778,6 @@ static int stm32_mdma_setup_xfer(struct
/* Enable interrupts */
ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE;
- if (sg_len > 1)
- ccr |= STM32_MDMA_CCR_BTIE;
desc->ccr = ccr;
return 0;
@@ -1325,12 +1323,21 @@ static size_t stm32_mdma_desc_residue(st
{
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
struct stm32_mdma_hwdesc *hwdesc;
- u32 cbndtr, residue, modulo, burst_size;
+ u32 cisr, clar, cbndtr, residue, modulo, burst_size;
int i;
+ cisr = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
+
residue = 0;
- for (i = curr_hwdesc + 1; i < desc->count; i++) {
+ /* Get the next hw descriptor to process from current transfer */
+ clar = stm32_mdma_read(dmadev, STM32_MDMA_CLAR(chan->id));
+ for (i = desc->count - 1; i >= 0; i--) {
hwdesc = desc->node[i].hwdesc;
+
+ if (hwdesc->clar == clar)
+ break;/* Current transfer found, stop cumulating */
+
+ /* Cumulate residue of unprocessed hw descriptors */
residue += STM32_MDMA_CBNDTR_BNDT(hwdesc->cbndtr);
}
cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
Patches currently in stable-queue which might be from amelie.delaunay@xxxxxxxxxxx are
queue-6.5/dmaengine-stm32-dma-fix-residue-in-case-of-mdma-chaining.patch
queue-6.5/dmaengine-stm32-mdma-abort-resume-if-no-ongoing-transfer.patch
queue-6.5/dmaengine-stm32-mdma-set-in_flight_bytes-in-case-crqa-flag-is-set.patch
queue-6.5/dmaengine-stm32-mdma-use-link-address-register-to-compute-residue.patch
queue-6.5/dmaengine-stm32-dma-fix-stm32_dma_prep_slave_sg-in-case-of-mdma-chaining.patch
