drm/etnaviv: add support for slave interface clock
The slave interface clock is a clock input found on newer cores to gate the register interface. For now we simply ungate it when the GPU is in active state. Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
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@ -1383,6 +1383,12 @@ static int etnaviv_gpu_clk_enable(struct etnaviv_gpu *gpu)
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{
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int ret;
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if (gpu->clk_reg) {
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ret = clk_prepare_enable(gpu->clk_reg);
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if (ret)
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return ret;
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}
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if (gpu->clk_bus) {
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ret = clk_prepare_enable(gpu->clk_bus);
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if (ret)
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@ -1421,6 +1427,8 @@ static int etnaviv_gpu_clk_disable(struct etnaviv_gpu *gpu)
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clk_disable_unprepare(gpu->clk_core);
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if (gpu->clk_bus)
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clk_disable_unprepare(gpu->clk_bus);
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if (gpu->clk_reg)
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clk_disable_unprepare(gpu->clk_reg);
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return 0;
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}
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@ -1676,6 +1684,11 @@ static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
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}
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/* Get Clocks: */
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gpu->clk_reg = devm_clk_get(&pdev->dev, "reg");
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DBG("clk_reg: %p", gpu->clk_reg);
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if (IS_ERR(gpu->clk_reg))
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gpu->clk_reg = NULL;
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gpu->clk_bus = devm_clk_get(&pdev->dev, "bus");
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DBG("clk_bus: %p", gpu->clk_bus);
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if (IS_ERR(gpu->clk_bus))
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@ -147,6 +147,7 @@ struct etnaviv_gpu {
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/* Power Control: */
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struct clk *clk_bus;
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struct clk *clk_reg;
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struct clk *clk_core;
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struct clk *clk_shader;
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