linux-stable/drivers/dma/dw/acpi.c
Andy Shevchenko 38e4fb6672 dmaengine: dw: Register ACPI DMA controller for PCI that has companion
If PCI enumerated controller has a companion device,
register it in the ACPI DMA controllers as well.

Fixes: f7c799e950 ("dmaengine: dw: we do support Merrifield SoC in PCI mode")
Depends-on: b685fe26e9 ("dmaengine: dw: platform: Split ACPI helpers to separate module")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200526182416.52805-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-06-16 21:54:47 +05:30

55 lines
1.2 KiB
C

// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2013,2019 Intel Corporation
#include <linux/acpi.h>
#include <linux/acpi_dma.h>
#include "internal.h"
static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
{
struct acpi_dma_spec *dma_spec = param;
struct dw_dma_slave slave = {
.dma_dev = dma_spec->dev,
.src_id = dma_spec->slave_id,
.dst_id = dma_spec->slave_id,
.m_master = 0,
.p_master = 1,
};
return dw_dma_filter(chan, &slave);
}
void dw_dma_acpi_controller_register(struct dw_dma *dw)
{
struct device *dev = dw->dma.dev;
struct acpi_dma_filter_info *info;
int ret;
if (!has_acpi_companion(dev))
return;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return;
dma_cap_zero(info->dma_cap);
dma_cap_set(DMA_SLAVE, info->dma_cap);
info->filter_fn = dw_dma_acpi_filter;
ret = acpi_dma_controller_register(dev, acpi_dma_simple_xlate, info);
if (ret)
dev_err(dev, "could not register acpi_dma_controller\n");
}
EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_register);
void dw_dma_acpi_controller_free(struct dw_dma *dw)
{
struct device *dev = dw->dma.dev;
if (!has_acpi_companion(dev))
return;
acpi_dma_controller_free(dev);
}
EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_free);