kernel/linux.git/drivers/dma/dw/platform.c, branch linux-4.20.y

dmaengine: dw: Add alternative ACPI HIDs for Cherry Trail DMA controllers

2018-08-29T16:24:56+00:00

Bay and Cherry Trail DSTDs represent a different set of devices depending on which OS the device think it is booting. One set of decices for Windows and another set of devices for Android which targets the Android-x86 Linux kernel fork (which e.g. used to have its own display driver instead of using the i915 driver). Which set of devices we are actually going to get is out of our control, this is controlled by the ACPI OSID variable, which gets either set through an EFI setup option, or sometimes is autodetected. So we need to support both. This commit adds support for the 80862286 and 808622C0 ACPI HIDs which we get for the first resp. second DMA controller on Cherry Trail devices when OSID is set to Android. Signed-off-by: Hans de Goede Signed-off-by: Vinod Koul

dmaengine: dw: simplify getting .drvdata

2018-04-22T06:20:56+00:00

We should get drvdata from struct device directly. Going via platform_device is an unneeded step back and forth. Signed-off-by: Wolfram Sang Acked-by: Viresh Kumar Signed-off-by: Vinod Koul

dmaengine: DW DMAC: Handle return value of clk_prepare_enable

2017-05-24T04:25:17+00:00

clk_prepare_enable() can fail here and we must check its return value. Signed-off-by: Arvind Yadav Acked-by: Viresh Kumar Acked-by: Andy Shevchenko Signed-off-by: Vinod Koul

dmaengine: dw: register IRQ and DMA pool with instance ID

2017-01-25T06:21:39+00:00

It is really useful not only for debugging to have an IRQ line and DMA pool labeled with driver and its instance ID. Do this for DesignWare DMA driver. All current users of this IP would be enhanced later on. Signed-off-by: Andy Shevchenko Signed-off-by: Vinod Koul

dmaengine: DW DMAC: add multi-block property to device tree

2016-11-30T03:27:50+00:00

Several versions of DW DMAC have multi block transfers hardware support. Hardware support of multi block transfers is disabled by default if we use DT to configure DMAC and software emulation of multi block transfers used instead. Add multi-block property, so it is possible to enable hardware multi block transfers (if present) via DT. Switch from per device is_nollp variable to multi_block array to be able enable/disable multi block transfers separately per channel. Acked-by: Andy Shevchenko Signed-off-by: Eugeniy Paltsev Signed-off-by: Vinod Koul

dmaengine: DW DMAC: enable memory-to-memory transfers support

2016-11-30T03:27:17+00:00

All known devices, which use DT for configuration, support memory-to-memory transfers. So enable it by default, if we read configuration from DT. Acked-by: Andy Shevchenko Signed-off-by: Eugeniy Paltsev Signed-off-by: Vinod Koul

dmaengine: dw: pass platform data via struct dw_dma_chip

2016-05-02T10:01:05+00:00

We pass struct dw_dma_chip to dw_dma_probe() anyway, thus we may use it to pass a platform data as well. While here, constify the source of the platform data. Acked-by: Viresh Kumar Signed-off-by: Andy Shevchenko Signed-off-by: Vinod Koul

dmaengine: dw: keep entire platform data in struct dw_dma

2016-05-02T10:01:05+00:00

Keep the entire platform data in the struct dw_dma. It makes the driver a bit cleaner. Acked-by: Viresh Kumar Signed-off-by: Andy Shevchenko Signed-off-by: Vinod Koul

dmaengine: dw: revisit data_width property

2016-05-02T10:00:47+00:00

There several changes are done here: - Convert the property to be in bytes Besides that this is a common practice for such property, the use of a value in bytes much more convenient than handling the encoded one. - Rename data_width to data-width in the device tree bindings The change leaves the support for the old format as well just in case someone will use a newer kernel with an old device tree blob. - While here, replace dwc_fast_ffs() by __ffs() Signed-off-by: Andy Shevchenko Acked-by: Viresh Kumar Signed-off-by: Vinod Koul

dmaengine: dw: platform: check nr_masters to be non-zero

2016-05-02T10:00:25+00:00

The value of nr_masters equal to 0 is invalid since this DMA controller has to have at least one master. Check this before we proceed with the rest of properties. Acked-by: Viresh Kumar Signed-off-by: Andy Shevchenko Signed-off-by: Vinod Koul