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drm/rockchip: dw_hdmi: introduce the pclk for grf

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For RK3399's GRF module, if we want to operate the graphic related grf
registers, we need to enable the pclk_vio_grf which supply power for VIO
GRF IOs, so it's better to introduce an optional grf clock in driver.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
Acked-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Mark Yao 2017-06-09 15:10:46 +08:00
parent 5e3bc6d1ab
commit 8814b40bf6
2 changed files with 19 additions and 0 deletions
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1
Documentation/devicetree/bindings/display/rockchip/dw_hdmi-rockchip.txt
View File

@ -32,6 +32,7 @@ Optional properties
I2C master controller.
- clock-names: See dw_hdmi.txt. The "cec" clock is optional.
- clock-names: May contain "cec" as defined in dw_hdmi.txt.
- clock-names: May contain "grf", power for grf io.
- clock-names: May contain "vpll", external clock for some hdmi phy.
Example:

18
drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
View File

@ -47,6 +47,7 @@ struct rockchip_hdmi {
struct drm_encoder encoder;
const struct rockchip_hdmi_chip_data *chip_data;
struct clk *vpll_clk;
struct clk *grf_clk;
};
#define to_rockchip_hdmi(x) container_of(x, struct rockchip_hdmi, x)
@ -181,6 +182,16 @@ static int rockchip_hdmi_parse_dt(struct rockchip_hdmi *hdmi)
return PTR_ERR(hdmi->vpll_clk);
}
hdmi->grf_clk = devm_clk_get(hdmi->dev, "grf");
if (PTR_ERR(hdmi->grf_clk) == -ENOENT) {
hdmi->grf_clk = NULL;
} else if (PTR_ERR(hdmi->grf_clk) == -EPROBE_DEFER) {
return -EPROBE_DEFER;
} else if (IS_ERR(hdmi->grf_clk)) {
dev_err(hdmi->dev, "failed to get grf clock\n");
return PTR_ERR(hdmi->grf_clk);
}
ret = clk_prepare_enable(hdmi->vpll_clk);
if (ret) {
dev_err(hdmi->dev, "Failed to enable HDMI vpll: %d\n", ret);
@ -246,10 +257,17 @@ static void dw_hdmi_rockchip_encoder_enable(struct drm_encoder *encoder)
else
val = hdmi->chip_data->lcdsel_big;
ret = clk_prepare_enable(hdmi->grf_clk);
if (ret < 0) {
dev_err(hdmi->dev, "failed to enable grfclk %d\n", ret);
return;
}
ret = regmap_write(hdmi->regmap, hdmi->chip_data->lcdsel_grf_reg, val);
if (ret != 0)
dev_err(hdmi->dev, "Could not write to GRF: %d\n", ret);
clk_disable_unprepare(hdmi->grf_clk);
dev_dbg(hdmi->dev, "vop %s output to hdmi\n",
ret ? "LIT" : "BIG");
}