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memory: mtk-smi: Add device-link between smi-larb and smi-common 

Normally, If the smi-larb HW need work, we should enable the smi-common
HW power and clock firstly.
This patch adds device-link between the smi-larb dev and the smi-common
dev. then If pm_runtime_get_sync(smi-larb-dev), the pm_runtime_get_sync
(smi-common-dev) will be called automatically.

Also, Add DL_FLAG_STATELESS to avoid the smi-common clocks be gated when
probe.

CC: Matthias Brugger <matthias.bgg@gmail.com>
Suggested-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210410091128.31823-5-yong.wu@mediatek.com
This commit is contained in:
Yong Wu 2021-04-10 17:11:16 +08:00 committed by Krzysztof Kozlowski
parent 132c17c3ff
commit 6ce2c05b21
1 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/memory/mtk-smi.c
View File

@ -319,6 +319,7 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct device_node *smi_node;
struct platform_device *smi_pdev;
struct device_link *link;
larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
if (!larb)
@ -358,6 +359,12 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
if (!platform_get_drvdata(smi_pdev))
return -EPROBE_DEFER;
larb->smi_common_dev = &smi_pdev->dev;
link = device_link_add(dev, larb->smi_common_dev,
DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
if (!link) {
dev_err(dev, "Unable to link smi-common dev\n");
return -ENODEV;
}
} else {
dev_err(dev, "Failed to get the smi_common device\n");
return -EINVAL;
@ -370,6 +377,9 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
static int mtk_smi_larb_remove(struct platform_device *pdev)
{
struct mtk_smi_larb *larb = platform_get_drvdata(pdev);
device_link_remove(&pdev->dev, larb->smi_common_dev);
pm_runtime_disable(&pdev->dev);
component_del(&pdev->dev, &mtk_smi_larb_component_ops);
return 0;
@ -381,17 +391,9 @@ static int __maybe_unused mtk_smi_larb_resume(struct device *dev)
const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
int ret;
/* Power on smi-common. */
ret = pm_runtime_resume_and_get(larb->smi_common_dev);
if (ret < 0) {
dev_err(dev, "Failed to pm get for smi-common(%d).\n", ret);
return ret;
}
ret = mtk_smi_clk_enable(&larb->smi);
if (ret < 0) {
dev_err(dev, "Failed to enable clock(%d).\n", ret);
pm_runtime_put_sync(larb->smi_common_dev);
return ret;
}
@ -406,7 +408,6 @@ static int __maybe_unused mtk_smi_larb_suspend(struct device *dev)
struct mtk_smi_larb *larb = dev_get_drvdata(dev);
mtk_smi_clk_disable(&larb->smi);
pm_runtime_put_sync(larb->smi_common_dev);
return 0;
}