Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-28 05:41:55 +00:00
Code Issues Packages Projects Releases Wiki Activity

ASoC: loongson: fix address space confusion

Browse Source 
The i2s driver uses the mapped __iomem address of the FIFO as the DMA
address for the device. This apparently works on loongarch because of
the way it handles __iomem pointers as aliases of physical addresses,
but this is not portable to other architectures and causes a compiler
warning when dma addresses are not the same size as pointers:

sound/soc/loongson/loongson_i2s_pci.c: In function 'loongson_i2s_pci_probe':
sound/soc/loongson/loongson_i2s_pci.c:110:29: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
  110 |         tx_data->dev_addr = (dma_addr_t)i2s->reg_base + LS_I2S_TX_DATA;
      |                             ^
sound/soc/loongson/loongson_i2s_pci.c:113:29: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
  113 |         rx_data->dev_addr = (dma_addr_t)i2s->reg_base + LS_I2S_RX_DATA;
      |                             ^

Change the driver to instead use the physical address as stored in the
PCI BAR resource directly. Since 'dev_addr' is a 32-bit address, I think
this results in the same truncated address on loongarch but is otherwise
closer to portable code and avoids the warning.

Fixes: d84881e068 ("ASoC: Add support for Loongson I2S controller")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/Message-Id: <20230622101235.3230941-1-arnd@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Arnd Bergmann 2023-06-22 12:12:22 +02:00 committed by Mark Brown
parent b2c28785b1
commit 012fa2622e
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sound/soc/loongson/loongson_i2s_pci.c
View File

@ -107,10 +107,10 @@ static int loongson_i2s_pci_probe(struct pci_dev *pdev,
tx_data = &i2s->tx_dma_data;
rx_data = &i2s->rx_dma_data;
tx_data->dev_addr = (dma_addr_t)i2s->reg_base + LS_I2S_TX_DATA;
tx_data->dev_addr = pci_resource_start(pdev, 0) + LS_I2S_TX_DATA;
tx_data->order_addr = i2s->reg_base + LS_I2S_TX_ORDER;
rx_data->dev_addr = (dma_addr_t)i2s->reg_base + LS_I2S_RX_DATA;
rx_data->dev_addr = pci_resource_start(pdev, 0) + LS_I2S_RX_DATA;
rx_data->order_addr = i2s->reg_base + LS_I2S_RX_ORDER;
tx_data->irq = fwnode_irq_get_byname(fwnode, "tx");