linux-kernel - [PATCH v3 0/2] dmaengine: dw-axi-dmac: PM cleanup and reset control support

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Message-ID: <20251016154627.175796-1-a.shimko.dev@gmail.com>
Date: Thu, 16 Oct 2025 18:46:24 +0300
From: Artem Shimko <a.shimko.dev@...il.com>
To: Vinod Koul <vkoul@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>
Cc: Eugeniy.Paltsev@...opsys.com,
	Artem Shimko <a.shimko.dev@...il.com>,
	linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org
Subject: [PATCH v3 0/2] dmaengine: dw-axi-dmac: PM cleanup and reset control support

Hello maintainers and reviewers,

This patch series improves the dw-axi-dmac driver in two areas:

Patch 1 simplifies the power management code by using modern kernel
macros and removing redundant wrapper functions, making the code more
maintainable and aligned with current kernel practices.

Patch 2 adds proper reset control support to ensure reliable
initialization and power management, handling resets during probe,
remove, and suspend/resume operations.

For debugging, I used dev_info from the suspend/resume functions.
Before pushing, I removed dev_info from the driver.

Suspend:
echo 0 > /sys/module/printk/parameters/console_suspend
echo mem > /sys/power/state
...
[  195.339311] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_suspend
[  195.350274] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_suspend
[  195.361223] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_suspend
...

Resume:
...
[  200.669945] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_resume
[  200.680975] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_resume
[  200.692108] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_resume
...

Best regards,
Artem Shimko

ChangeLog:
  v1:
    * https://lore.kernel.org/all/20251012100002.2959213-1-a.shimko.dev@gmail.com/T/#t
  v2:
    * https://lore.kernel.org/all/20251013150234.3200627-1-a.shimko.dev@gmail.com/T/#u
  v3:
    * add reset_control_deassert() to dw_remove() to have access to registers in
    case if reset has been asserted via suspend

Artem Shimko (2):
  dmaengine: dw-axi-dmac: simplify PM functions and use modern macros
  dmaengine: dw-axi-dmac: add reset control support

 .../dma/dw-axi-dmac/dw-axi-dmac-platform.c    | 73 +++++++++----------
 drivers/dma/dw-axi-dmac/dw-axi-dmac.h         |  1 +
 2 files changed, 36 insertions(+), 38 deletions(-)

-- 
2.43.0