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dmaengine: sh: rcar-dmac: SMMU doesn't need IPMMU workaround

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R-Car Gen5 doesn't use an IPMMU anymore, but a SMMU. So, the workaround
for the IPMMU becomes optional. Add a flag to distinguish. No functional
change.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260909094009.2167-8-wsa+renesas@sang-engineering.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Wolfram Sang 2026-09-09 11:40:11 +02:00 committed by Vinod Koul
parent a416b65679
commit 7381230764
1 changed files with 7 additions and 1 deletions
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8
drivers/dma/sh/rcar-dmac.c
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@ -219,10 +219,12 @@ struct rcar_dmac {
* struct rcar_dmac_of_data - This driver's OF data
* @chan_offset_base: DMAC channels base offset
* @chan_offset_stride: DMAC channels offset stride
* @broken_ipmmu_microTLB0: flag if the connected IPMMU has microTLB0 issues
*/
struct rcar_dmac_of_data {
u32 chan_offset_base;
u32 chan_offset_stride;
unsigned int broken_ipmmu_microTLB0:1;
};
/* -----------------------------------------------------------------------------
@ -1877,8 +1879,9 @@ static int rcar_dmac_probe(struct platform_device *pdev)
* can't use it with the IPMMU. As the IOMMU API operates at the device
* level we can't disable it selectively, so ignore channel 0 for now if
* the device is part of an IOMMU group.
* Not applicable if system uses something else than IPMMU like SMMU.
*/
if (device_iommu_mapped(&pdev->dev))
if (data->broken_ipmmu_microTLB0 && device_iommu_mapped(&pdev->dev))
dmac->channels_mask &= ~BIT(0);
dmac->channels = devm_kcalloc(&pdev->dev, dmac->n_channels,
@ -2000,11 +2003,14 @@ static void rcar_dmac_shutdown(struct platform_device *pdev)
static const struct rcar_dmac_of_data rcar_dmac_data = {
.chan_offset_base = 0x8000,
.chan_offset_stride = 0x80,
.broken_ipmmu_microTLB0 = 1,
};
static const struct rcar_dmac_of_data rcar_gen4_dmac_data = {
.chan_offset_base = 0x0,
.chan_offset_stride = 0x1000,
/* Set to play safe. Needs testing if Gen4 is really affected */
.broken_ipmmu_microTLB0 = 1,
};
static const struct of_device_id rcar_dmac_of_ids[] = {