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drm/msm/mdp5: Avoid printing error messages for optional clocks

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The current behavior is to try to get optional clocks and print a
dev_err message in case of failure. This looks rather confusing
and may increase with the amount of optional clocks.

We may need a cleaner way to handle per-device clocks but in the
meantime, let's reduce the amount of dev_err messages during the
probe.

Signed-off-by: Stephane Viau <sviau@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Stephane Viau 2015-09-15 08:41:47 -04:00 committed by Rob Clark
parent 5e921b1926
commit d40325b437
2 changed files with 18 additions and 12 deletions
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3
Documentation/devicetree/bindings/drm/msm/mdp.txt
View File

@ -11,13 +11,14 @@ Required properties:
- clock-names: the following clocks are required:
* "core_clk"
* "iface_clk"
* "lut_clk"
* "src_clk"
* "hdmi_clk"
* "mpd_clk"
Optional properties:
- gpus: phandle for gpu device
- clock-names: the following clocks are optional:
* "lut_clk"
Example:

27
drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
View File

@ -452,15 +452,19 @@ static void read_hw_revision(struct mdp5_kms *mdp5_kms,
}
static int get_clk(struct platform_device *pdev, struct clk **clkp,
const char *name)
const char *name, bool mandatory)
{
struct device *dev = &pdev->dev;
struct clk *clk = devm_clk_get(dev, name);
if (IS_ERR(clk)) {
if (IS_ERR(clk) && mandatory) {
dev_err(dev, "failed to get %s (%ld)\n", name, PTR_ERR(clk));
return PTR_ERR(clk);
}
*clkp = clk;
if (IS_ERR(clk))
DBG("skipping %s", name);
else
*clkp = clk;
return 0;
}
@ -514,25 +518,26 @@ struct msm_kms *mdp5_kms_init(struct drm_device *dev)
goto fail;
}
ret = get_clk(pdev, &mdp5_kms->axi_clk, "bus_clk");
/* mandatory clocks: */
ret = get_clk(pdev, &mdp5_kms->axi_clk, "bus_clk", true);
if (ret)
goto fail;
ret = get_clk(pdev, &mdp5_kms->ahb_clk, "iface_clk");
ret = get_clk(pdev, &mdp5_kms->ahb_clk, "iface_clk", true);
if (ret)
goto fail;
ret = get_clk(pdev, &mdp5_kms->src_clk, "core_clk_src");
ret = get_clk(pdev, &mdp5_kms->src_clk, "core_clk_src", true);
if (ret)
goto fail;
ret = get_clk(pdev, &mdp5_kms->core_clk, "core_clk");
ret = get_clk(pdev, &mdp5_kms->core_clk, "core_clk", true);
if (ret)
goto fail;
ret = get_clk(pdev, &mdp5_kms->lut_clk, "lut_clk");
if (ret)
DBG("failed to get (optional) lut_clk clock");
ret = get_clk(pdev, &mdp5_kms->vsync_clk, "vsync_clk");
ret = get_clk(pdev, &mdp5_kms->vsync_clk, "vsync_clk", true);
if (ret)
goto fail;
/* optional clocks: */
get_clk(pdev, &mdp5_kms->lut_clk, "lut_clk", false);
/* we need to set a default rate before enabling. Set a safe
* rate first, then figure out hw revision, and then set a
* more optimal rate: