diff options
| author | Jernej Skrabec <jernej.skrabec@siol.net> | 2019-05-27 22:14:54 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2019-06-04 17:56:59 +0530 |
| commit | 43a90fc76a3ebe0ce3315725c7f0fa832df50c8e (patch) | |
| tree | 0e6a25cbc06e738599758aafb7f60a9883646c54 /drivers/dma/sun6i-dma.c | |
| parent | f48d14c218ccaaf7c22f84582d4bdb5fa2234c76 (diff) | |
| download | linux-43a90fc76a3ebe0ce3315725c7f0fa832df50c8e.tar.bz2 | |
dmaengine: sun6i: Add a quirk for additional mbus clock
H6 DMA controller needs additional mbus clock to be enabled.
Add a quirk for it and handle it accordingly.
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/sun6i-dma.c')
| -rw-r--r-- | drivers/dma/sun6i-dma.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c index 0cd13f17fc11..7d9606997251 100644 --- a/drivers/dma/sun6i-dma.c +++ b/drivers/dma/sun6i-dma.c @@ -129,6 +129,7 @@ struct sun6i_dma_config { u32 dst_burst_lengths; u32 src_addr_widths; u32 dst_addr_widths; + bool has_mbus_clk; }; /* @@ -182,6 +183,7 @@ struct sun6i_dma_dev { struct dma_device slave; void __iomem *base; struct clk *clk; + struct clk *clk_mbus; int irq; spinlock_t lock; struct reset_control *rstc; @@ -1208,6 +1210,14 @@ static int sun6i_dma_probe(struct platform_device *pdev) return PTR_ERR(sdc->clk); } + if (sdc->cfg->has_mbus_clk) { + sdc->clk_mbus = devm_clk_get(&pdev->dev, "mbus"); + if (IS_ERR(sdc->clk_mbus)) { + dev_err(&pdev->dev, "No mbus clock specified\n"); + return PTR_ERR(sdc->clk_mbus); + } + } + sdc->rstc = devm_reset_control_get(&pdev->dev, NULL); if (IS_ERR(sdc->rstc)) { dev_err(&pdev->dev, "No reset controller specified\n"); @@ -1312,11 +1322,19 @@ static int sun6i_dma_probe(struct platform_device *pdev) goto err_reset_assert; } + if (sdc->cfg->has_mbus_clk) { + ret = clk_prepare_enable(sdc->clk_mbus); + if (ret) { + dev_err(&pdev->dev, "Couldn't enable mbus clock\n"); + goto err_clk_disable; + } + } + ret = devm_request_irq(&pdev->dev, sdc->irq, sun6i_dma_interrupt, 0, dev_name(&pdev->dev), sdc); if (ret) { dev_err(&pdev->dev, "Cannot request IRQ\n"); - goto err_clk_disable; + goto err_mbus_clk_disable; } ret = dma_async_device_register(&sdc->slave); @@ -1341,6 +1359,8 @@ err_dma_unregister: dma_async_device_unregister(&sdc->slave); err_irq_disable: sun6i_kill_tasklet(sdc); +err_mbus_clk_disable: + clk_disable_unprepare(sdc->clk_mbus); err_clk_disable: clk_disable_unprepare(sdc->clk); err_reset_assert: @@ -1359,6 +1379,7 @@ static int sun6i_dma_remove(struct platform_device *pdev) sun6i_kill_tasklet(sdc); + clk_disable_unprepare(sdc->clk_mbus); clk_disable_unprepare(sdc->clk); reset_control_assert(sdc->rstc); |