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drm/rockchip: dsi: enable hclk before pclk

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There is a risk of access failure, if pclk
is enabled without enabling hclk in rk3568.

Change-Id: I02c2a0d8ad6c0d2c6649ee16ab50dda0da542aac
Signed-off-by: Guochun Huang <hero.huang@rock-chips.com>
This commit is contained in:
Guochun Huang
2020-11-17 11:17:58 +08:00
committed by Tao Huang
parent ad3cad3616
commit 35d1482625
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/rockchip/dw-mipi-dsi.c
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@@ -262,6 +262,7 @@ struct dw_mipi_dsi {
struct device_node *client;
struct regmap *grf;
struct clk *pclk;
struct clk *hclk;
struct mipi_dphy dphy;
struct regmap *regmap;
struct reset_control *rst;
@@ -1701,6 +1702,13 @@ static int dw_mipi_dsi_probe(struct platform_device *pdev)
return ret;
}
dsi->hclk = devm_clk_get_optional(dev, "hclk");
if (IS_ERR(dsi->hclk)) {
ret = PTR_ERR(dsi->hclk);
DRM_DEV_ERROR(dev, "Unable to get hclk: %d\n", ret);
return ret;
}
dsi->regmap = devm_regmap_init_mmio(dev, regs,
&dw_mipi_dsi_regmap_config);
if (IS_ERR(dsi->regmap)) {
@@ -1762,6 +1770,7 @@ static int __maybe_unused dw_mipi_dsi_runtime_suspend(struct device *dev)
struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
clk_disable_unprepare(dsi->pclk);
clk_disable_unprepare(dsi->hclk);
clk_disable_unprepare(dsi->dphy.hs_clk);
clk_disable_unprepare(dsi->dphy.ref_clk);
clk_disable_unprepare(dsi->dphy.cfg_clk);
@@ -1776,6 +1785,7 @@ static int __maybe_unused dw_mipi_dsi_runtime_resume(struct device *dev)
clk_prepare_enable(dsi->dphy.cfg_clk);
clk_prepare_enable(dsi->dphy.ref_clk);
clk_prepare_enable(dsi->dphy.hs_clk);
clk_prepare_enable(dsi->hclk);
clk_prepare_enable(dsi->pclk);
return 0;