dmaengine: dw: Select only supported masters for ACPI devices

commit f0e870a upstream.

The recently submitted fix-commit revealed a problem in the iDMA 32-bit
platform code. Even though the controller supported only a single master
the dw_dma_acpi_filter() method hard-coded two master interfaces with IDs
0 and 1. As a result the sanity check implemented in the commit
b336268 ("dmaengine: dw: Add peripheral bus width verification")
got incorrect interface data width and thus prevented the client drivers
from configuring the DMA-channel with the EINVAL error returned. E.g.,
the next error was printed for the PXA2xx SPI controller driver trying
to configure the requested channels:

> [  164.525604] pxa2xx_spi_pci 0000:00:07.1: DMA slave config failed
> [  164.536105] pxa2xx_spi_pci 0000:00:07.1: failed to get DMA TX descriptor
> [  164.543213] spidev spi-SPT0001:00: SPI transfer failed: -16

The problem would have been spotted much earlier if the iDMA 32-bit
controller supported more than one master interfaces. But since it
supports just a single master and the iDMA 32-bit specific code just
ignores the master IDs in the CTLLO preparation method, the issue has
been gone unnoticed so far.

Fix the problem by specifying the default master ID for both memory
and peripheral devices in the driver data. Thus the issue noticed for
the iDMA 32-bit controllers will be eliminated and the ACPI-probed
DW DMA controllers will be configured with the correct master ID by
default.

Cc: [email protected]
Fixes: b336268 ("dmaengine: dw: Add peripheral bus width verification")
Fixes: 199244d ("dmaengine: dw: add support of iDMA 32-bit hardware")
Reported-by: Ferry Toth <[email protected]>
Closes: https://lore.kernel.org/dmaengine/[email protected]/
Reported-by: Andy Shevchenko <[email protected]>
Closes: https://lore.kernel.org/dmaengine/[email protected]/
Tested-by: Ferry Toth <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: andy-shev

drivers/dma/dw/acpi.c

@@ -8,13 +8,15 @@
 
 static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
 {
+	struct dw_dma *dw = to_dw_dma(chan->device);
+	struct dw_dma_chip_pdata *data = dev_get_drvdata(dw->dma.dev);
 	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,
+		.m_master = data->m_master,
+		.p_master = data->p_master,
 	};
 
 	return dw_dma_filter(chan, &slave);

drivers/dma/dw/internal.h

@@ -51,11 +51,15 @@ struct dw_dma_chip_pdata {
 	int (*probe)(struct dw_dma_chip *chip);
 	int (*remove)(struct dw_dma_chip *chip);
 	struct dw_dma_chip *chip;
+	u8 m_master;
+	u8 p_master;
 };
 
 static __maybe_unused const struct dw_dma_chip_pdata dw_dma_chip_pdata = {
 	.probe = dw_dma_probe,
 	.remove = dw_dma_remove,
+	.m_master = 0,
+	.p_master = 1,
 };
 
 static const struct dw_dma_platform_data idma32_pdata = {
@@ -72,6 +76,8 @@ static __maybe_unused const struct dw_dma_chip_pdata idma32_chip_pdata = {
 	.pdata = &idma32_pdata,
 	.probe = idma32_dma_probe,
 	.remove = idma32_dma_remove,
+	.m_master = 0,
+	.p_master = 0,
 };
 
 static const struct dw_dma_platform_data xbar_pdata = {
@@ -88,6 +94,8 @@ static __maybe_unused const struct dw_dma_chip_pdata xbar_chip_pdata = {
 	.pdata = &xbar_pdata,
 	.probe = idma32_dma_probe,
 	.remove = idma32_dma_remove,
+	.m_master = 0,
+	.p_master = 0,
 };
 
 #endif /* _DMA_DW_INTERNAL_H */

drivers/dma/dw/pci.c

@@ -56,10 +56,10 @@ static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
 	if (ret)
 		return ret;
 
-	dw_dma_acpi_controller_register(chip->dw);
-
 	pci_set_drvdata(pdev, data);
 
+	dw_dma_acpi_controller_register(chip->dw);
+
 	return 0;
 }