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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>
This commit is contained in:
Lucas Stach 2018-01-19 15:05:40 +01:00
parent 4df3000ebc
commit 65f037e8e9
2 changed files with 14 additions and 0 deletions
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13
drivers/gpu/drm/etnaviv/etnaviv_gpu.c
View File

@ -1383,6 +1383,12 @@ static int etnaviv_gpu_clk_enable(struct etnaviv_gpu *gpu)
{
int ret;
if (gpu->clk_reg) {
ret = clk_prepare_enable(gpu->clk_reg);
if (ret)
return ret;
}
if (gpu->clk_bus) {
ret = clk_prepare_enable(gpu->clk_bus);
if (ret)
@ -1421,6 +1427,8 @@ static int etnaviv_gpu_clk_disable(struct etnaviv_gpu *gpu)
clk_disable_unprepare(gpu->clk_core);
if (gpu->clk_bus)
clk_disable_unprepare(gpu->clk_bus);
if (gpu->clk_reg)
clk_disable_unprepare(gpu->clk_reg);
return 0;
}
@ -1676,6 +1684,11 @@ static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
}
/* Get Clocks: */
gpu->clk_reg = devm_clk_get(&pdev->dev, "reg");
DBG("clk_reg: %p", gpu->clk_reg);
if (IS_ERR(gpu->clk_reg))
gpu->clk_reg = NULL;
gpu->clk_bus = devm_clk_get(&pdev->dev, "bus");
DBG("clk_bus: %p", gpu->clk_bus);
if (IS_ERR(gpu->clk_bus))

1
drivers/gpu/drm/etnaviv/etnaviv_gpu.h
View File

@ -147,6 +147,7 @@ struct etnaviv_gpu {
/* Power Control: */
struct clk *clk_bus;
struct clk *clk_reg;
struct clk *clk_core;
struct clk *clk_shader;