diff mbox series

[v2,3/5] iommu/mediatek: Remove the power status checking in tlb flush all

Message ID 20211208120744.2415-4-dafna.hirschfeld@collabora.com (mailing list archive)
State New, archived
Headers show
Series iommu/mediatek: Fix tlb flush logic | expand

Commit Message

Dafna Hirschfeld Dec. 8, 2021, 12:07 p.m. UTC 
From: Yong Wu <yong.wu@mediatek.com>

To simplify the code, Remove the power status checking in the
tlb_flush_all, remove this:
   if (pm_runtime_get_if_in_use(data->dev) <= 0)
	    continue;

The mtk_iommu_tlb_flush_all is called from
a) isr
b) tlb flush range fail case
c) iommu_create_device_direct_mappings

In first two cases, the power and clock are always enabled.
In the third case tlb flush is unnecessary because in a later patch
in the series a full flush from the pm_runtime_resume callback is added.

In addition, writing the tlb control register when the iommu is not resumed
is ok and the write is ignored.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
[refactor commit log]
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/iommu/mtk_iommu.c | 5 -----
 1 file changed, 5 deletions(-)

Comments

AngeloGioacchino Del Regno Jan. 10, 2022, 11:43 a.m. UTC | #1 
Il 08/12/21 13:07, Dafna Hirschfeld ha scritto:
> From: Yong Wu <yong.wu@mediatek.com>
> 
> To simplify the code, Remove the power status checking in the
> tlb_flush_all, remove this:
>     if (pm_runtime_get_if_in_use(data->dev) <= 0)
> 	    continue;
> 
> The mtk_iommu_tlb_flush_all is called from
> a) isr
> b) tlb flush range fail case
> c) iommu_create_device_direct_mappings
> 
> In first two cases, the power and clock are always enabled.
> In the third case tlb flush is unnecessary because in a later patch
> in the series a full flush from the pm_runtime_resume callback is added.
> 
> In addition, writing the tlb control register when the iommu is not resumed
> is ok and the write is ignored.
> 
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> [refactor commit log]
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
diff mbox series

Patch

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index dd2c08c54df4..e30ac68fab48 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -210,15 +210,10 @@  static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
 
 static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
 {
-	if (pm_runtime_get_if_in_use(data->dev) <= 0)
-		return;
-
 	writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
 		       data->base + data->plat_data->inv_sel_reg);
 	writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE);
 	wmb(); /* Make sure the tlb flush all done */
-
-	pm_runtime_put(data->dev);
 }
 
 static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,