[v4,2/6] drm/etnaviv: add a dedicated function to get various clocks
Commit Message
Because it is also platform-dependent, there are environments where don't
have CLK subsystem support, for example, discreted PCI gpu. So don't rage
quit if there is no CLK subsystem.
For the GPU in LS7a1000 and LS2k2000, the working frequency of the GPU is
tuned by configuring the PLL register directly.
Signed-off-by: Sui Jingfeng <suijingfeng@loongson.cn>
---
drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 62 ++++++++++++++++++---------
drivers/gpu/drm/etnaviv/etnaviv_gpu.h | 1 +
2 files changed, 42 insertions(+), 21 deletions(-)
@@ -1565,10 +1565,45 @@ static irqreturn_t irq_handler(int irq, void *data)
return ret;
}
+static int etnaviv_gpu_clk_get(struct etnaviv_gpu *gpu)
+{
+ struct device *dev = gpu->dev;
+
+ if (gpu->no_clk)
+ return 0;
+
+ gpu->clk_reg = devm_clk_get_optional(dev, "reg");
+ DBG("clk_reg: %p", gpu->clk_reg);
+ if (IS_ERR(gpu->clk_reg))
+ return PTR_ERR(gpu->clk_reg);
+
+ gpu->clk_bus = devm_clk_get_optional(dev, "bus");
+ DBG("clk_bus: %p", gpu->clk_bus);
+ if (IS_ERR(gpu->clk_bus))
+ return PTR_ERR(gpu->clk_bus);
+
+ gpu->clk_core = devm_clk_get(dev, "core");
+ DBG("clk_core: %p", gpu->clk_core);
+ if (IS_ERR(gpu->clk_core))
+ return PTR_ERR(gpu->clk_core);
+ gpu->base_rate_core = clk_get_rate(gpu->clk_core);
+
+ gpu->clk_shader = devm_clk_get_optional(dev, "shader");
+ DBG("clk_shader: %p", gpu->clk_shader);
+ if (IS_ERR(gpu->clk_shader))
+ return PTR_ERR(gpu->clk_shader);
+ gpu->base_rate_shader = clk_get_rate(gpu->clk_shader);
+
+ return 0;
+}
+
static int etnaviv_gpu_clk_enable(struct etnaviv_gpu *gpu)
{
int ret;
+ if (gpu->no_clk)
+ return 0;
+
ret = clk_prepare_enable(gpu->clk_reg);
if (ret)
return ret;
@@ -1599,6 +1634,9 @@ static int etnaviv_gpu_clk_enable(struct etnaviv_gpu *gpu)
static int etnaviv_gpu_clk_disable(struct etnaviv_gpu *gpu)
{
+ if (gpu->no_clk)
+ return 0;
+
clk_disable_unprepare(gpu->clk_shader);
clk_disable_unprepare(gpu->clk_core);
clk_disable_unprepare(gpu->clk_bus);
@@ -1865,27 +1903,9 @@ static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
return err;
/* Get Clocks: */
- gpu->clk_reg = devm_clk_get_optional(&pdev->dev, "reg");
- DBG("clk_reg: %p", gpu->clk_reg);
- if (IS_ERR(gpu->clk_reg))
- return PTR_ERR(gpu->clk_reg);
-
- gpu->clk_bus = devm_clk_get_optional(&pdev->dev, "bus");
- DBG("clk_bus: %p", gpu->clk_bus);
- if (IS_ERR(gpu->clk_bus))
- return PTR_ERR(gpu->clk_bus);
-
- gpu->clk_core = devm_clk_get(&pdev->dev, "core");
- DBG("clk_core: %p", gpu->clk_core);
- if (IS_ERR(gpu->clk_core))
- return PTR_ERR(gpu->clk_core);
- gpu->base_rate_core = clk_get_rate(gpu->clk_core);
-
- gpu->clk_shader = devm_clk_get_optional(&pdev->dev, "shader");
- DBG("clk_shader: %p", gpu->clk_shader);
- if (IS_ERR(gpu->clk_shader))
- return PTR_ERR(gpu->clk_shader);
- gpu->base_rate_shader = clk_get_rate(gpu->clk_shader);
+ err = etnaviv_gpu_clk_get(gpu);
+ if (err)
+ return err;
/* TODO: figure out max mapped size */
dev_set_drvdata(dev, gpu);
@@ -148,6 +148,7 @@ struct etnaviv_gpu {
struct clk *clk_reg;
struct clk *clk_core;
struct clk *clk_shader;
+ bool no_clk;
unsigned int freq_scale;
unsigned long base_rate_core;