On 2014년 06월 18일 22:42, Rahul Sharma wrote:
> HDMI probe proceeds with dummy regulators when the regulators
> are not provided in DT node or regulator provider has not get
> probed or failed to register the regulators.
>
> This patch modify hdmi driver to defer the probe in case the
> regulators are not available.
No, already available. See the below comments.
>
> Signed-off-by: Rahul Sharma <rahul.sharma@xxxxxxxxxxx>
> ---
> Based on exynos-drm-fixes branch in Inki dae's tree.
> drivers/gpu/drm/exynos/exynos_hdmi.c | 69 ++++++++++++++++++++++++----------
> 1 file changed, 50 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
> index aa259b0..3f24c49 100644
> --- a/drivers/gpu/drm/exynos/exynos_hdmi.c
> +++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
> @@ -83,7 +83,7 @@ struct hdmi_resources {
> struct clk *sclk_pixel;
> struct clk *sclk_hdmiphy;
> struct clk *mout_hdmi;
> - struct regulator_bulk_data *regul_bulk;
> + struct regulator **regulators;
> int regul_count;
> };
>
> @@ -2022,6 +2022,36 @@ static void hdmi_commit(struct exynos_drm_display *display)
> hdmi_conf_apply(hdata);
> }
>
> +int hdmi_regulator_enable(struct hdmi_context *hdata)
> +{
> + struct hdmi_resources *res = &hdata->res;
> + int i, ret;
> +
> + for (i = 0; i < res->regul_count; ++i) {
> + ret = regulator_enable(res->regulators[i]);
> + if (ret < 0) {
> + DRM_ERROR("fail to enable regulators.\n");
> + return ret;
> + }
> + }
> + return 0;
> +}
> +
> +int hdmi_regulator_disable(struct hdmi_context *hdata)
> +{
> + struct hdmi_resources *res = &hdata->res;
> + int i, ret;
> +
> + for (i = 0; i < res->regul_count; ++i) {
> + ret = regulator_disable(res->regulators[i]);
> + if (ret < 0) {
> + DRM_ERROR("fail to disable regulators.\n");
> + return ret;
> + }
> + }
> + return 0;
> +}
> +
> static void hdmi_poweron(struct exynos_drm_display *display)
> {
> struct hdmi_context *hdata = display->ctx;
> @@ -2039,8 +2069,8 @@ static void hdmi_poweron(struct exynos_drm_display *display)
>
> pm_runtime_get_sync(hdata->dev);
>
> - if (regulator_bulk_enable(res->regul_count, res->regul_bulk))
> - DRM_DEBUG_KMS("failed to enable regulator bulk\n");
> + if (hdmi_regulator_enable(hdata))
> + DRM_DEBUG_KMS("failed to enable regulators\n");
>
> /* set pmu hdmiphy control bit to enable hdmiphy */
> regmap_update_bits(hdata->pmureg, PMU_HDMI_PHY_CONTROL,
> @@ -2077,7 +2107,8 @@ static void hdmi_poweroff(struct exynos_drm_display *display)
> regmap_update_bits(hdata->pmureg, PMU_HDMI_PHY_CONTROL,
> PMU_HDMI_PHY_ENABLE_BIT, 0);
>
> - regulator_bulk_disable(res->regul_count, res->regul_bulk);
> + if (hdmi_regulator_disable(hdata))
> + DRM_DEBUG_KMS("failed to disable regulators\n");
>
> pm_runtime_put_sync(hdata->dev);
>
> @@ -2211,24 +2242,24 @@ static int hdmi_resources_init(struct hdmi_context *hdata)
>
> clk_set_parent(res->mout_hdmi, res->sclk_pixel);
>
> - res->regul_bulk = devm_kzalloc(dev, ARRAY_SIZE(supply) *
> - sizeof(res->regul_bulk[0]), GFP_KERNEL);
> - if (!res->regul_bulk) {
> - ret = -ENOMEM;
> - goto fail;
> - }
> + res->regul_count = ARRAY_SIZE(supply);
> +
> + res->regulators = devm_kzalloc(dev, res->regul_count *
> + sizeof(res->regulators[0]), GFP_KERNEL);
> + if (!res->regulators)
> + return -ENOMEM;
> +
> for (i = 0; i < ARRAY_SIZE(supply); ++i) {
> - res->regul_bulk[i].supply = supply[i];
> - res->regul_bulk[i].consumer = NULL;
> - }
> - ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(supply), res->regul_bulk);
> - if (ret) {
> - DRM_ERROR("failed to get regulators\n");
> - return ret;
> + res->regulators[i] =
> + devm_regulator_get_optional(dev, supply[i]);
> + if (IS_ERR(res->regulators[i])) {
> + DRM_ERROR("fail to get regulator: %s.\n",
> + supply[i]);
> + return -EPROBE_DEFER;
devm_regulator_get_optional function would return -EPROBE_DEFER if
needed. So it's not good to force returning -EPROBE_DEFER in case of all
errors.
Thanks,
Inki Dae
> + }
> }
> - res->regul_count = ARRAY_SIZE(supply);
>
> - return ret;
> + return 0;
> fail:
> DRM_ERROR("HDMI resource init - failed\n");
> return ret;
>
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