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drm/bridge: ti-sn65dsi83: Add vcc supply regulator support

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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>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211213133626.2498056-5-alexander.stein@ew.tq-group.com
This commit is contained in:
Alexander Stein 2021-12-13 14:36:26 +01:00 • committed by Robert Foss
parent e6ba217381
commit 5664e3c907
No known key found for this signature in database
GPG key ID: 3EFD900F76D1D784
1 changed files with 18 additions and 0 deletions
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18
drivers/gpu/drm/bridge/ti-sn65dsi83.c
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@ -33,6 +33,7 @@
#include <linux/of_device.h> #include <linux/of_device.h>
#include <linux/of_graph.h> #include <linux/of_graph.h>
#include <linux/regmap.h> #include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_atomic_helper.h> #include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h> #include <drm/drm_bridge.h>
@ -143,6 +144,7 @@ struct sn65dsi83 {
struct mipi_dsi_device *dsi; struct mipi_dsi_device *dsi;
struct drm_bridge *panel_bridge; struct drm_bridge *panel_bridge;
struct gpio_desc *enable_gpio; struct gpio_desc *enable_gpio;
struct regulator *vcc;
int dsi_lanes; int dsi_lanes;
bool lvds_dual_link; bool lvds_dual_link;
bool lvds_dual_link_even_odd_swap; bool lvds_dual_link_even_odd_swap;
@ -337,6 +339,12 @@ static void sn65dsi83_atomic_enable(struct drm_bridge *bridge,
u16 val; u16 val;
int ret; int ret;
ret = regulator_enable(ctx->vcc);
if (ret) {
dev_err(ctx->dev, "Failed to enable vcc: %d\n", ret);
return;
}
/* Deassert reset */ /* Deassert reset */
gpiod_set_value(ctx->enable_gpio, 1); gpiod_set_value(ctx->enable_gpio, 1);
usleep_range(1000, 1100); 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 drm_bridge_state *old_bridge_state)
{ {
struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge); struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
int ret;
/* Put the chip in reset, pull EN line low, and assure 10ms reset low timing. */ /* Put the chip in reset, pull EN line low, and assure 10ms reset low timing. */
gpiod_set_value(ctx->enable_gpio, 0); gpiod_set_value(ctx->enable_gpio, 0);
usleep_range(10000, 11000); 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); 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->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; return 0;
} }