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Subject[PATCH v4 2/2] drm/stm: dsi: add regulator support
Date
Add support of regulator for the phy part of the DSI
controller.

Signed-off-by: Yannick Fertré <yannick.fertre@st.com>
Acked-by: Philippe Cornu <philippe.cornu@st.com>
---
drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 60 ++++++++++++++++++++++++++++-------
1 file changed, 49 insertions(+), 11 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..d8e4a14 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)
@@ -314,21 +316,36 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dsi->base = devm_ioremap_resource(dev, res);
if (IS_ERR(dsi->base)) {
- DRM_ERROR("Unable to get dsi registers\n");
- return PTR_ERR(dsi->base);
+ ret = PTR_ERR(dsi->base);
+ DRM_ERROR("Unable to get dsi registers %d\n", ret);
+ return ret;
+ }
+
+ dsi->vdd_supply = devm_regulator_get(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("Failed to enable pllref_clk: %d\n", ret);
+ goto err_clk_get;
}

dw_mipi_dsi_stm_plat_data.base = dsi->base;
@@ -338,20 +355,28 @@ 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);
+ DRM_ERROR("Failed to initialize mipi dsi host: %d\n", ret);
+ 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)
{
struct dw_mipi_dsi_stm *dsi = platform_get_drvdata(pdev);

- clk_disable_unprepare(dsi->pllref_clk);
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;
}
@@ -370,10 +396,22 @@ static int __maybe_unused dw_mipi_dsi_stm_suspend(struct device *dev)
static int __maybe_unused 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");

- clk_prepare_enable(dsi->pllref_clk);
+ ret = regulator_enable(dsi->vdd_supply);
+ if (ret) {
+ DRM_ERROR("Failed to enable regulator: %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(dsi->pllref_clk);
+ if (ret) {
+ regulator_disable(dsi->vdd_supply);
+ DRM_ERROR("Failed to enable pllref_clk: %d\n", ret);
+ return ret;
+ }

return 0;
}
--
2.7.4
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