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SubjectRe: [PATCH v2 2/3] drm/stm: dsi: add support of an optional regulator
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Dear Yannick,
Thank you for your patch,

I like better the new shorter commit heading, thank you.


On 5/10/19 4:20 PM, Yannick Fertré wrote:
> Add support of an optional regulator for the phy part of the DSI
> controller.
>
> Signed-off-by: Yannick Fertré <yannick.fertre@st.com>
> ---
> drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 45 ++++++++++++++++++++++++++++++-----
> 1 file changed, 39 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> index 1bef73e..22bd095 100644
> --- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> +++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> @@ -9,6 +9,7 @@
> #include <linux/clk.h>
> #include <linux/iopoll.h>
> #include <linux/module.h>
> +#include <linux/regulator/consumer.h>
> #include <drm/drmP.h>
> #include <drm/drm_mipi_dsi.h>
> #include <drm/bridge/dw_mipi_dsi.h>
> @@ -76,6 +77,7 @@ struct dw_mipi_dsi_stm {
> u32 hw_version;
> int lane_min_kbps;
> int lane_max_kbps;
> + struct regulator *vdd_supply;
> };
>
> static inline void dsi_write(struct dw_mipi_dsi_stm *dsi, u32 reg, u32 val)
> @@ -318,17 +320,31 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
> return PTR_ERR(dsi->base);
> }
>
> + dsi->vdd_supply = devm_regulator_get_optional(dev, "phy-dsi");
> + if (IS_ERR(dsi->vdd_supply)) {
> + ret = PTR_ERR(dsi->vdd_supply);
> + if (ret != -EPROBE_DEFER)
> + DRM_ERROR("failed to request regulator: %d\n", ret);
> + return ret;
> + }
> +
> + ret = regulator_enable(dsi->vdd_supply);
> + if (ret) {
> + DRM_ERROR("failed to enable regulator: %d\n", ret);
> + return ret;
> + }
> +
> dsi->pllref_clk = devm_clk_get(dev, "ref");
> if (IS_ERR(dsi->pllref_clk)) {
> ret = PTR_ERR(dsi->pllref_clk);
> - dev_err(dev, "Unable to get pll reference clock: %d\n", ret);
> - return ret;
> + DRM_ERROR("Unable to get pll reference clock: %d\n", ret);
> + goto err_clk_get;
> }
>
> ret = clk_prepare_enable(dsi->pllref_clk);
> if (ret) {
> - dev_err(dev, "%s: Failed to enable pllref_clk\n", __func__);
> - return ret;
> + DRM_ERROR("%s: Failed to enable pllref_clk\n", __func__);
> + goto err_clk_get;
> }
>
> dw_mipi_dsi_stm_plat_data.base = dsi->base;
> @@ -339,11 +355,19 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
> dsi->dsi = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data);
> if (IS_ERR(dsi->dsi)) {
> DRM_ERROR("Failed to initialize mipi dsi host\n");
> - clk_disable_unprepare(dsi->pllref_clk);
> - return PTR_ERR(dsi->dsi);
> + ret = PTR_ERR(dsi->dsi);
> + goto err_dsi_probe;
> }
>
> return 0;
> +
> +err_dsi_probe:
> + clk_disable_unprepare(dsi->pllref_clk);
> +err_clk_get:
> + regulator_disable(dsi->vdd_supply);
> +
> + return ret;
> +
> }
>
> static int dw_mipi_dsi_stm_remove(struct platform_device *pdev)
> @@ -351,6 +375,7 @@ static int dw_mipi_dsi_stm_remove(struct platform_device *pdev)
> struct dw_mipi_dsi_stm *dsi = platform_get_drvdata(pdev);
>
> clk_disable_unprepare(dsi->pllref_clk);
> + regulator_disable(dsi->vdd_supply);
> dw_mipi_dsi_remove(dsi->dsi);

for a future patch: we may have a different order
dw_mipi_dsi_remove(dsi->dsi);
clk_disable_unprepare(dsi->pllref_clk);
regulator_disable(dsi->vdd_supply);

>
> return 0;
> @@ -363,6 +388,7 @@ static int __maybe_unused dw_mipi_dsi_stm_suspend(struct device *dev)
> DRM_DEBUG_DRIVER("\n");
>
> clk_disable_unprepare(dsi->pllref_clk);
> + regulator_disable(dsi->vdd_supply);
>
> return 0;
> }
> @@ -370,9 +396,16 @@ static int __maybe_unused dw_mipi_dsi_stm_suspend(struct device *dev)
> static int __maybe_unudw_mipi_dsi_remove(dsi->dsi);sed dw_mipi_dsi_stm_resume(struct device *dev)
> {
> struct dw_mipi_dsi_stm *dsi = dw_mipi_dsi_stm_plat_data.priv_data;
> + int ret;
>
> DRM_DEBUG_DRIVER("\n");
>
> + ret = regulator_enable(dsi->vdd_supply);
> + if (ret) {
> + DRM_ERROR("failed to enable regulator: %d\n", ret);
> + return ret;
> + }
> +
> clk_prepare_enable(dsi->pllref_clk);

for a future patch: we may check clk_prepare_enable return value.

>
> return 0;
>


Acked-by: Philippe Cornu <philippe.cornu@st.com>

Philippe :)
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