From 012fa2622e30675f61413485785e708ba02be78b Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Thu, 22 Jun 2023 12:12:22 +0200
Subject: [PATCH] ASoC: loongson: fix address space confusion
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: d84881e06836d ("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>
---
sound/soc/loongson/loongson_i2s_pci.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/soc/loongson/loongson_i2s_pci.c b/sound/soc/loongson/loongson_i2s_pci.c
index 6dcfb17d3276d..fa90361865c6c 100644
--- a/sound/soc/loongson/loongson_i2s_pci.c
+++ b/sound/soc/loongson/loongson_i2s_pci.c
@@ -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");
--
2.30.2