[PATCH v7 2/4] soc: mediatek: Init MT8173 scpsys driver earlier
From: James Liao <hidden>
Date: 2016-05-16 09:29:16
Also in:
linux-devicetree, linux-mediatek, lkml
Subsystem:
arm/mediatek soc support, the rest · Maintainers:
Matthias Brugger, AngeloGioacchino Del Regno, Linus Torvalds
Some power domain comsumers may init before module_init. So the power domain provider (scpsys) need to be initialized earlier too. Take an example for our IOMMU (M4U) and SMI. SMI is a bridge between IOMMU and multimedia HW. SMI is responsible to enable/disable iommu and help transfer data for each multimedia HW. Both of them have to wait until the power and clocks are enabled. So scpsys driver should be initialized before SMI, and SMI should be initialized before IOMMU, and then init IOMMU consumers (display/vdec/venc/camera etc.). IOMMU is subsys_init by default. So we need to init scpsys driver before subsys_init. Signed-off-by: James Liao <redacted> Reviewed-by: Kevin Hilman <khilman@baylibre.com> --- drivers/soc/mediatek/mtk-scpsys.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index 5870a24..00c0adb 100644
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c@@ -617,4 +617,21 @@ static struct platform_driver scpsys_drv = { .of_match_table = of_match_ptr(of_scpsys_match_tbl), }, }; -builtin_platform_driver(scpsys_drv); + +static int __init scpsys_drv_init(void) +{ + return platform_driver_register(&scpsys_drv); +} + +/* + * There are some Mediatek drivers which depend on the power domain driver need + * to probe in earlier initcall levels. So scpsys driver also need to probe + * earlier. + * + * IOMMU(M4U) and SMI drivers for example. SMI is a bridge between IOMMU and + * multimedia HW. IOMMU depends on SMI, and SMI is a power domain consumer, + * so the proper probe sequence should be scpsys -> SMI -> IOMMU driver. + * IOMMU drivers are initialized during subsys_init by default, so we need to + * move SMI and scpsys drivers to subsys_init or earlier init levels. + */ +subsys_initcall(scpsys_drv_init);
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1.9.1