VCC needs to be enabled before releasing the enable GPIO.
Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Alexander Stein alexander.stein@ew.tq-group.com --- drivers/gpu/drm/bridge/ti-sn65dsi83.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c index 065610edc37a..5650a793db81 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c @@ -33,6 +33,7 @@ #include <linux/of_device.h> #include <linux/of_graph.h> #include <linux/regmap.h> +#include <linux/regulator/consumer.h>
#include <drm/drm_atomic_helper.h> #include <drm/drm_bridge.h> @@ -143,6 +144,7 @@ struct sn65dsi83 { struct mipi_dsi_device *dsi; struct drm_bridge *panel_bridge; struct gpio_desc *enable_gpio; + struct regulator *vcc; int dsi_lanes; bool lvds_dual_link; bool lvds_dual_link_even_odd_swap; @@ -337,6 +339,12 @@ static void sn65dsi83_atomic_enable(struct drm_bridge *bridge, u16 val; int ret;
+ ret = regulator_enable(ctx->vcc); + if (ret) { + dev_err(ctx->dev, "Failed to enable vcc: %d\n", ret); + return; + } + /* Deassert reset */ gpiod_set_value(ctx->enable_gpio, 1); usleep_range(1000, 1100); @@ -486,11 +494,16 @@ static void sn65dsi83_atomic_disable(struct drm_bridge *bridge, struct drm_bridge_state *old_bridge_state) { struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge); + int ret;
/* Put the chip in reset, pull EN line low, and assure 10ms reset low timing. */ gpiod_set_value(ctx->enable_gpio, 0); usleep_range(10000, 11000);
+ ret = regulator_disable(ctx->vcc); + if (ret) + dev_err(ctx->dev, "Failed to disable vcc: %d\n", ret); + regcache_mark_dirty(ctx->regmap); }
@@ -599,6 +612,11 @@ static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model)
ctx->panel_bridge = panel_bridge;
+ ctx->vcc = devm_regulator_get(dev, "vcc"); + if (IS_ERR(ctx->vcc)) + return dev_err_probe(dev, PTR_ERR(ctx->vcc), + "Failed to get supply 'vcc'\n"); + return 0; }