<feed xmlns='http://www.w3.org/2005/Atom'>
<title>linux-toradex.git/drivers/dma, branch v6.14-rc2</title>
<subtitle>Linux kernel for Apalis and Colibri modules</subtitle>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/'/>
<entry>
<title>Merge tag 'dmaengine-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine</title>
<updated>2025-01-29T22:29:57+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2025-01-29T22:29:57+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=7c775c6056d07eb777f37c7ac1340115b27dc9f8'/>
<id>7c775c6056d07eb777f37c7ac1340115b27dc9f8</id>
<content type='text'>
Pull dmaengine updates from Vinod Koul:
 "A bunch of new device support and updates to few drivers, biggest of
  them amd ones.

  New support:
   - TI J722S CSI BCDMA controller support
   - Intel idxd Panther Lake family platforms
   - Allwinner F1C100s suniv DMA
   - Qualcomm QCS615, QCS8300, SM8750, SA8775P GPI dma controller support
   - AMD ae4dma controller support and reorganisation of amd driver

  Updates:
   - Channel page support for Nvidia Tegra210 adma driver
   - Freescale support for S32G based platforms
   - Yamilfy atmel dma bindings"

* tag 'dmaengine-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine: (45 commits)
  dmaengine: idxd: Enable Function Level Reset (FLR) for halt
  dmaengine: idxd: Refactor halt handler
  dmaengine: idxd: Add idxd_device_config_save() and idxd_device_config_restore() helpers
  dmaengine: idxd: Binding and unbinding IDXD device and driver
  dmaengine: idxd: Add idxd_pci_probe_alloc() helper
  dt-bindings: dma: atmel: Convert to json schema
  dt-bindings: dma: st-stm32-dmamux: Add description for dma-cell values
  dmaengine: qcom: gpi: Add GPI immediate DMA support for SPI protocol
  dt-bindings: dma: adi,axi-dmac: deprecate adi,channels node
  dt-bindings: dma: adi,axi-dmac: convert to yaml schema
  dmaengine: mv_xor: switch to for_each_child_of_node_scoped()
  dmaengine: bcm2835-dma: Prevent suspend if DMA channel is busy
  dmaengine: tegra210-adma: Support channel page
  dt-bindings: dma: Support channel page to nvidia,tegra210-adma
  dmaengine: ti: k3-udma: Add support for J722S CSI BCDMA
  dt-bindings: dma: ti: k3-bcdma: Add J722S CSI BCDMA
  dmaengine: ti: edma: fix OF node reference leaks in edma_driver
  dmaengine: ti: edma: make the loop condition simpler in edma_probe()
  dmaengine: fsl-edma: read/write multiple registers in cyclic transactions
  dmaengine: fsl-edma: add support for S32G based platforms
  ...
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull dmaengine updates from Vinod Koul:
 "A bunch of new device support and updates to few drivers, biggest of
  them amd ones.

  New support:
   - TI J722S CSI BCDMA controller support
   - Intel idxd Panther Lake family platforms
   - Allwinner F1C100s suniv DMA
   - Qualcomm QCS615, QCS8300, SM8750, SA8775P GPI dma controller support
   - AMD ae4dma controller support and reorganisation of amd driver

  Updates:
   - Channel page support for Nvidia Tegra210 adma driver
   - Freescale support for S32G based platforms
   - Yamilfy atmel dma bindings"

* tag 'dmaengine-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine: (45 commits)
  dmaengine: idxd: Enable Function Level Reset (FLR) for halt
  dmaengine: idxd: Refactor halt handler
  dmaengine: idxd: Add idxd_device_config_save() and idxd_device_config_restore() helpers
  dmaengine: idxd: Binding and unbinding IDXD device and driver
  dmaengine: idxd: Add idxd_pci_probe_alloc() helper
  dt-bindings: dma: atmel: Convert to json schema
  dt-bindings: dma: st-stm32-dmamux: Add description for dma-cell values
  dmaengine: qcom: gpi: Add GPI immediate DMA support for SPI protocol
  dt-bindings: dma: adi,axi-dmac: deprecate adi,channels node
  dt-bindings: dma: adi,axi-dmac: convert to yaml schema
  dmaengine: mv_xor: switch to for_each_child_of_node_scoped()
  dmaengine: bcm2835-dma: Prevent suspend if DMA channel is busy
  dmaengine: tegra210-adma: Support channel page
  dt-bindings: dma: Support channel page to nvidia,tegra210-adma
  dmaengine: ti: k3-udma: Add support for J722S CSI BCDMA
  dt-bindings: dma: ti: k3-bcdma: Add J722S CSI BCDMA
  dmaengine: ti: edma: fix OF node reference leaks in edma_driver
  dmaengine: ti: edma: make the loop condition simpler in edma_probe()
  dmaengine: fsl-edma: read/write multiple registers in cyclic transactions
  dmaengine: fsl-edma: add support for S32G based platforms
  ...
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 'x86_cpu_for_v6.14_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip</title>
<updated>2025-01-21T17:30:59+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2025-01-21T17:30:59+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=48795f90cbdcccc36cc415a2d785a23a4b23e57a'/>
<id>48795f90cbdcccc36cc415a2d785a23a4b23e57a</id>
<content type='text'>
Pull x86 cpuid updates from Borislav Petkov:

 - Remove the less generic CPU matching infra around struct x86_cpu_desc
   and use the generic struct x86_cpu_id thing

 - Remove magic naked numbers for CPUID functions and use proper defines
   of the prefix CPUID_LEAF_*. Consolidate some of the crazy use around
   the tree

 - Smaller cleanups and improvements

* tag 'x86_cpu_for_v6.14_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/cpu: Make all all CPUID leaf names consistent
  x86/fpu: Remove unnecessary CPUID level check
  x86/fpu: Move CPUID leaf definitions to common code
  x86/tsc: Remove CPUID "frequency" leaf magic numbers.
  x86/tsc: Move away from TSC leaf magic numbers
  x86/cpu: Move TSC CPUID leaf definition
  x86/cpu: Refresh DCA leaf reading code
  x86/cpu: Remove unnecessary MwAIT leaf checks
  x86/cpu: Use MWAIT leaf definition
  x86/cpu: Move MWAIT leaf definition to common header
  x86/cpu: Remove 'x86_cpu_desc' infrastructure
  x86/cpu: Move AMD erratum 1386 table over to 'x86_cpu_id'
  x86/cpu: Replace PEBS use of 'x86_cpu_desc' use with 'x86_cpu_id'
  x86/cpu: Expose only stepping min/max interface
  x86/cpu: Introduce new microcode matching helper
  x86/cpufeature: Document cpu_feature_enabled() as the default to use
  x86/paravirt: Remove the WBINVD callback
  x86/cpufeatures: Free up unused feature bits
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull x86 cpuid updates from Borislav Petkov:

 - Remove the less generic CPU matching infra around struct x86_cpu_desc
   and use the generic struct x86_cpu_id thing

 - Remove magic naked numbers for CPUID functions and use proper defines
   of the prefix CPUID_LEAF_*. Consolidate some of the crazy use around
   the tree

 - Smaller cleanups and improvements

* tag 'x86_cpu_for_v6.14_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/cpu: Make all all CPUID leaf names consistent
  x86/fpu: Remove unnecessary CPUID level check
  x86/fpu: Move CPUID leaf definitions to common code
  x86/tsc: Remove CPUID "frequency" leaf magic numbers.
  x86/tsc: Move away from TSC leaf magic numbers
  x86/cpu: Move TSC CPUID leaf definition
  x86/cpu: Refresh DCA leaf reading code
  x86/cpu: Remove unnecessary MwAIT leaf checks
  x86/cpu: Use MWAIT leaf definition
  x86/cpu: Move MWAIT leaf definition to common header
  x86/cpu: Remove 'x86_cpu_desc' infrastructure
  x86/cpu: Move AMD erratum 1386 table over to 'x86_cpu_id'
  x86/cpu: Replace PEBS use of 'x86_cpu_desc' use with 'x86_cpu_id'
  x86/cpu: Expose only stepping min/max interface
  x86/cpu: Introduce new microcode matching helper
  x86/cpufeature: Document cpu_feature_enabled() as the default to use
  x86/paravirt: Remove the WBINVD callback
  x86/cpufeatures: Free up unused feature bits
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 'dmaengine-fix-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine</title>
<updated>2024-12-26T18:43:25+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2024-12-26T18:43:25+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=23db0ed34f9e3756d243c5dc56d9f7c1fadecf89'/>
<id>23db0ed34f9e3756d243c5dc56d9f7c1fadecf89</id>
<content type='text'>
Pull dmaengine fixes from Vinod Koul:
 "Bunch of minor driver fixes for drivers in this cycle:

   - Kernel doc warning documentation fixes

   - apple driver fix for register access

   - amd driver dropping private dma_ops

   - freescale cleanup path fix

   - refcount fix for mv_xor driver

   - null pointer deref fix for at_xdmac driver

   - GENMASK to GENMASK_ULL fix for loongson2 apb driver

   - Tegra driver fix for correcting dma status"

* tag 'dmaengine-fix-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine:
  dmaengine: tegra: Return correct DMA status when paused
  dmaengine: mv_xor: fix child node refcount handling in early exit
  dmaengine: fsl-edma: implement the cleanup path of fsl_edma3_attach_pd()
  dmaengine: amd: qdma: Remove using the private get and set dma_ops APIs
  dmaengine: apple-admac: Avoid accessing registers in probe
  linux/dmaengine.h: fix a few kernel-doc warnings
  dmaengine: loongson2-apb: Change GENMASK to GENMASK_ULL
  dmaengine: dw: Select only supported masters for ACPI devices
  dmaengine: at_xdmac: avoid null_prt_deref in at_xdmac_prep_dma_memset
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull dmaengine fixes from Vinod Koul:
 "Bunch of minor driver fixes for drivers in this cycle:

   - Kernel doc warning documentation fixes

   - apple driver fix for register access

   - amd driver dropping private dma_ops

   - freescale cleanup path fix

   - refcount fix for mv_xor driver

   - null pointer deref fix for at_xdmac driver

   - GENMASK to GENMASK_ULL fix for loongson2 apb driver

   - Tegra driver fix for correcting dma status"

* tag 'dmaengine-fix-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine:
  dmaengine: tegra: Return correct DMA status when paused
  dmaengine: mv_xor: fix child node refcount handling in early exit
  dmaengine: fsl-edma: implement the cleanup path of fsl_edma3_attach_pd()
  dmaengine: amd: qdma: Remove using the private get and set dma_ops APIs
  dmaengine: apple-admac: Avoid accessing registers in probe
  linux/dmaengine.h: fix a few kernel-doc warnings
  dmaengine: loongson2-apb: Change GENMASK to GENMASK_ULL
  dmaengine: dw: Select only supported masters for ACPI devices
  dmaengine: at_xdmac: avoid null_prt_deref in at_xdmac_prep_dma_memset
</pre>
</div>
</content>
</entry>
<entry>
<title>dmaengine: idxd: Enable Function Level Reset (FLR) for halt</title>
<updated>2024-12-24T10:38:05+00:00</updated>
<author>
<name>Fenghua Yu</name>
<email>fenghua.yu@intel.com</email>
</author>
<published>2024-11-22T23:30:28+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=98d187a989036096feaa2fef1ec3b2240ecdeacf'/>
<id>98d187a989036096feaa2fef1ec3b2240ecdeacf</id>
<content type='text'>
When DSA/IAA device hits a fatal error, the device enters a halt state.
The driver can reset the device depending on Reset Type required by
hardware to recover the device.

Supported Reset Types are:
0: Reset Device command
1: Function Level Reset (FLR)
2: Warm reset
3: Cold reset

Currently, the driver only supports Reset Type 0.

This patch adds support for FLR recovery Type 1. Before issuing a PCIe
FLR command, IDXD device and WQ states are saved. After the FLR command
execution, the device is recovered to its previous states, allowing
the user can continue using the device.

Signed-off-by: Fenghua Yu &lt;fenghua.yu@intel.com&gt;
Reviewed-by: Dave Jiang &lt;dave.jiang@intel.com&gt;
Link: https://lore.kernel.org/r/20241122233028.2762809-6-fenghua.yu@intel.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
When DSA/IAA device hits a fatal error, the device enters a halt state.
The driver can reset the device depending on Reset Type required by
hardware to recover the device.

Supported Reset Types are:
0: Reset Device command
1: Function Level Reset (FLR)
2: Warm reset
3: Cold reset

Currently, the driver only supports Reset Type 0.

This patch adds support for FLR recovery Type 1. Before issuing a PCIe
FLR command, IDXD device and WQ states are saved. After the FLR command
execution, the device is recovered to its previous states, allowing
the user can continue using the device.

Signed-off-by: Fenghua Yu &lt;fenghua.yu@intel.com&gt;
Reviewed-by: Dave Jiang &lt;dave.jiang@intel.com&gt;
Link: https://lore.kernel.org/r/20241122233028.2762809-6-fenghua.yu@intel.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>dmaengine: idxd: Refactor halt handler</title>
<updated>2024-12-24T10:38:04+00:00</updated>
<author>
<name>Fenghua Yu</name>
<email>fenghua.yu@intel.com</email>
</author>
<published>2024-11-22T23:30:27+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=3e114fa0fd1506c9e75aa0e2eb6a9050eb16b2f8'/>
<id>3e114fa0fd1506c9e75aa0e2eb6a9050eb16b2f8</id>
<content type='text'>
Define a halt handling helper idxd_halt(). Refactor the halt interrupt
handler to call the helper. This will simplify the Function Level
Reset (FLR) code.

No functional change.

Signed-off-by: Fenghua Yu &lt;fenghua.yu@intel.com&gt;
Reviewed-by: Dave Jiang &lt;dave.jiang@intel.com&gt;
Link: https://lore.kernel.org/r/20241122233028.2762809-5-fenghua.yu@intel.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Define a halt handling helper idxd_halt(). Refactor the halt interrupt
handler to call the helper. This will simplify the Function Level
Reset (FLR) code.

No functional change.

Signed-off-by: Fenghua Yu &lt;fenghua.yu@intel.com&gt;
Reviewed-by: Dave Jiang &lt;dave.jiang@intel.com&gt;
Link: https://lore.kernel.org/r/20241122233028.2762809-5-fenghua.yu@intel.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>dmaengine: idxd: Add idxd_device_config_save() and idxd_device_config_restore() helpers</title>
<updated>2024-12-24T10:38:04+00:00</updated>
<author>
<name>Fenghua Yu</name>
<email>fenghua.yu@intel.com</email>
</author>
<published>2024-11-22T23:30:26+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=6078a315aec15e0776fa90347cf4eba7478cdbd7'/>
<id>6078a315aec15e0776fa90347cf4eba7478cdbd7</id>
<content type='text'>
Add the helpers to save and restore IDXD device configurations.

These helpers will be called during Function Level Reset (FLR) processing.

Signed-off-by: Fenghua Yu &lt;fenghua.yu@intel.com&gt;
Reviewed-by: Dave Jiang &lt;dave.jiang@intel.com&gt;
Link: https://lore.kernel.org/r/20241122233028.2762809-4-fenghua.yu@intel.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Add the helpers to save and restore IDXD device configurations.

These helpers will be called during Function Level Reset (FLR) processing.

Signed-off-by: Fenghua Yu &lt;fenghua.yu@intel.com&gt;
Reviewed-by: Dave Jiang &lt;dave.jiang@intel.com&gt;
Link: https://lore.kernel.org/r/20241122233028.2762809-4-fenghua.yu@intel.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>dmaengine: idxd: Binding and unbinding IDXD device and driver</title>
<updated>2024-12-24T10:38:04+00:00</updated>
<author>
<name>Fenghua Yu</name>
<email>fenghua.yu@intel.com</email>
</author>
<published>2024-11-22T23:30:25+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=3ab45516772b813315324dc63a900703144e80c4'/>
<id>3ab45516772b813315324dc63a900703144e80c4</id>
<content type='text'>
Add idxd_bind() and idxd_unbind() helpers to bind and unbind the IDXD
device and driver.

These helpers will be called during Function Level Reset (FLR) processing.

Signed-off-by: Fenghua Yu &lt;fenghua.yu@intel.com&gt;
Reviewed-by: Dave Jiang &lt;dave.jiang@intel.com&gt;
Link: https://lore.kernel.org/r/20241122233028.2762809-3-fenghua.yu@intel.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Add idxd_bind() and idxd_unbind() helpers to bind and unbind the IDXD
device and driver.

These helpers will be called during Function Level Reset (FLR) processing.

Signed-off-by: Fenghua Yu &lt;fenghua.yu@intel.com&gt;
Reviewed-by: Dave Jiang &lt;dave.jiang@intel.com&gt;
Link: https://lore.kernel.org/r/20241122233028.2762809-3-fenghua.yu@intel.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>dmaengine: idxd: Add idxd_pci_probe_alloc() helper</title>
<updated>2024-12-24T10:38:04+00:00</updated>
<author>
<name>Fenghua Yu</name>
<email>fenghua.yu@intel.com</email>
</author>
<published>2024-11-22T23:30:24+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=087e89b69b5fe5529a8809a06b4b4680e54f87e2'/>
<id>087e89b69b5fe5529a8809a06b4b4680e54f87e2</id>
<content type='text'>
Add the idxd_pci_probe_alloc() helper to probe IDXD PCI device with or
without allocating and setting idxd software values.

The idxd_pci_probe() function is refactored to call this helper and
always probe the IDXD device with allocating and setting the software
values.

This helper will be called later in the Function Level Reset (FLR)
process without modifying the idxd software data.

Signed-off-by: Fenghua Yu &lt;fenghua.yu@intel.com&gt;
Reviewed-by: Dave Jiang &lt;dave.jiang@intel.com&gt;
Link: https://lore.kernel.org/r/20241122233028.2762809-2-fenghua.yu@intel.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Add the idxd_pci_probe_alloc() helper to probe IDXD PCI device with or
without allocating and setting idxd software values.

The idxd_pci_probe() function is refactored to call this helper and
always probe the IDXD device with allocating and setting the software
values.

This helper will be called later in the Function Level Reset (FLR)
process without modifying the idxd software data.

Signed-off-by: Fenghua Yu &lt;fenghua.yu@intel.com&gt;
Reviewed-by: Dave Jiang &lt;dave.jiang@intel.com&gt;
Link: https://lore.kernel.org/r/20241122233028.2762809-2-fenghua.yu@intel.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>dmaengine: qcom: gpi: Add GPI immediate DMA support for SPI protocol</title>
<updated>2024-12-24T10:35:42+00:00</updated>
<author>
<name>Jyothi Kumar Seerapu</name>
<email>quic_jseerapu@quicinc.com</email>
</author>
<published>2024-12-09T07:50:33+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=a131169dfa48d6d40da45bca67d1e4f54fa130a6'/>
<id>a131169dfa48d6d40da45bca67d1e4f54fa130a6</id>
<content type='text'>
The DMA TRE(Transfer ring element) buffer contains the DMA
buffer address. Accessing data from this address can cause
significant delays in SPI transfers, which can be mitigated to
some extent by utilizing immediate DMA support.

QCOM GPI DMA hardware supports an immediate DMA feature for data
up to 8 bytes, storing the data directly in the DMA TRE buffer
instead of the DMA buffer address. This enhancement enables faster
SPI data transfers.

This optimization reduces the average transfer time from 25 us to
16 us for a single SPI transfer of 8 bytes length, with a clock
frequency of 50 MHz.

Signed-off-by: Jyothi Kumar Seerapu &lt;quic_jseerapu@quicinc.com&gt;
Reviewed-by: Neil Armstrong &lt;neil.armstrong@linaro.org&gt;
Tested-by: Neil Armstrong &lt;neil.armstrong@linaro.org&gt; # on SM8550-QRD
Reviewed-by: Dmitry Baryshkov &lt;dmitry.baryshkov@linaro.org&gt;
Link: https://lore.kernel.org/r/20241209075033.16860-1-quic_jseerapu@quicinc.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
The DMA TRE(Transfer ring element) buffer contains the DMA
buffer address. Accessing data from this address can cause
significant delays in SPI transfers, which can be mitigated to
some extent by utilizing immediate DMA support.

QCOM GPI DMA hardware supports an immediate DMA feature for data
up to 8 bytes, storing the data directly in the DMA TRE buffer
instead of the DMA buffer address. This enhancement enables faster
SPI data transfers.

This optimization reduces the average transfer time from 25 us to
16 us for a single SPI transfer of 8 bytes length, with a clock
frequency of 50 MHz.

Signed-off-by: Jyothi Kumar Seerapu &lt;quic_jseerapu@quicinc.com&gt;
Reviewed-by: Neil Armstrong &lt;neil.armstrong@linaro.org&gt;
Tested-by: Neil Armstrong &lt;neil.armstrong@linaro.org&gt; # on SM8550-QRD
Reviewed-by: Dmitry Baryshkov &lt;dmitry.baryshkov@linaro.org&gt;
Link: https://lore.kernel.org/r/20241209075033.16860-1-quic_jseerapu@quicinc.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>dmaengine: tegra: Return correct DMA status when paused</title>
<updated>2024-12-24T10:19:30+00:00</updated>
<author>
<name>Akhil R</name>
<email>akhilrajeev@nvidia.com</email>
</author>
<published>2024-12-12T12:44:12+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=ebc008699fd95701c9af5ebaeb0793eef81a71d5'/>
<id>ebc008699fd95701c9af5ebaeb0793eef81a71d5</id>
<content type='text'>
Currently, the driver does not return the correct DMA status when a DMA
pause is issued by the client drivers. This causes GPCDMA users to
assume that DMA is still running, while in reality, the DMA is paused.

Return DMA_PAUSED for tx_status() if the channel is paused in the middle
of a transfer.

Fixes: ee17028009d4 ("dmaengine: tegra: Add tegra gpcdma driver")
Cc: stable@vger.kernel.org
Signed-off-by: Akhil R &lt;akhilrajeev@nvidia.com&gt;
Signed-off-by: Kartik Rajput &lt;kkartik@nvidia.com&gt;
Link: https://lore.kernel.org/r/20241212124412.5650-1-kkartik@nvidia.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Currently, the driver does not return the correct DMA status when a DMA
pause is issued by the client drivers. This causes GPCDMA users to
assume that DMA is still running, while in reality, the DMA is paused.

Return DMA_PAUSED for tx_status() if the channel is paused in the middle
of a transfer.

Fixes: ee17028009d4 ("dmaengine: tegra: Add tegra gpcdma driver")
Cc: stable@vger.kernel.org
Signed-off-by: Akhil R &lt;akhilrajeev@nvidia.com&gt;
Signed-off-by: Kartik Rajput &lt;kkartik@nvidia.com&gt;
Link: https://lore.kernel.org/r/20241212124412.5650-1-kkartik@nvidia.com
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
</pre>
</div>
</content>
</entry>
</feed>
