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Commit b681af0b authored by Clément Péron's avatar Clément Péron Committed by Rob Herring
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drm: panfrost: add optional bus_clock 



Allwinner H6 has an ARM Mali-T720 MP2 which required a bus_clock.

Add an optional bus_clock at the init of the panfrost driver.

Signed-off-by: default avatarClément Péron <peron.clem@gmail.com>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190521161102.29620-2-peron.clem@gmail.com
parent d4db6c08

drivers/gpu/drm/panfrost/panfrost_device.c

+22 −0
Original line number Diff line number Diff line
@@ -55,11 +55,33 @@ static int panfrost_clk_init(struct panfrost_device *pfdev) 
	if (err)

		return err;



	pfdev->bus_clock = devm_clk_get_optional(pfdev->dev, "bus");

	if (IS_ERR(pfdev->bus_clock)) {

		dev_err(pfdev->dev, "get bus_clock failed %ld\n",

			PTR_ERR(pfdev->bus_clock));

		return PTR_ERR(pfdev->bus_clock);

	}



	if (pfdev->bus_clock) {

		rate = clk_get_rate(pfdev->bus_clock);

		dev_info(pfdev->dev, "bus_clock rate = %lu\n", rate);



		err = clk_prepare_enable(pfdev->bus_clock);

		if (err)

			goto disable_clock;

	}



	return 0;



disable_clock:

	clk_disable_unprepare(pfdev->clock);



	return err;

}



static void panfrost_clk_fini(struct panfrost_device *pfdev)

{

	clk_disable_unprepare(pfdev->bus_clock);

	clk_disable_unprepare(pfdev->clock);

}

drivers/gpu/drm/panfrost/panfrost_device.h

+1 −0
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ struct panfrost_device { 


	void __iomem *iomem;

	struct clk *clock;

	struct clk *bus_clock;

	struct regulator *regulator;

	struct reset_control *rstc;