CC: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Alexandre Courbot <gnurou@xxxxxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
Signed-off-by: Shobhit Kumar <shobhit.kumar@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dsi.c | 25 +++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_dsi.h | 3 +++
2 files changed, 28 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 219421c..511446f 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -32,6 +32,7 @@
#include <drm/drm_mipi_dsi.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
+#include <linux/pwm.h>
#include "i915_drv.h"
#include "intel_drv.h"
#include "intel_dsi.h"
@@ -402,6 +403,10 @@ static void intel_dsi_enable(struct intel_encoder *encoder)
intel_dsi_port_enable(encoder);
}
+
+ /* Enable the backlight with default PWM as programmed by BIOS */
+ pwm_enable(intel_dsi->pwm);
+ pwm_config_alternate(intel_dsi->pwm, 0x7F, 100);
}
static void intel_dsi_pre_enable(struct intel_encoder *encoder)
@@ -467,6 +472,11 @@ static void intel_dsi_pre_disable(struct intel_encoder *encoder)
DRM_DEBUG_KMS("\n");
+ /* Disable the backlight */
+ pwm_config_alternate(intel_dsi->pwm, 0x7F, 0);
+ usleep_range(2000, 3000);
+ pwm_disable(intel_dsi->pwm);
+
if (is_vid_mode(intel_dsi)) {
/* Send Shutdown command to the panel in LP mode */
for_each_dsi_port(port, intel_dsi->ports)
@@ -971,6 +981,10 @@ static void intel_dsi_encoder_destroy(struct drm_encoder *encoder)
if (intel_dsi->gpio_panel)
gpiod_put(intel_dsi->gpio_panel);
+ /* dispose of the pwm */
+ if (intel_dsi->pwm)
+ pwm_put(intel_dsi->pwm);
+
intel_encoder_destroy(encoder);
}
@@ -1098,6 +1112,17 @@ void intel_dsi_init(struct drm_device *dev)
DRM_ERROR("Failed to own gpio for panel control\n");
intel_dsi->gpio_panel = NULL;
}
+
+ /* Get the PWM chip for backlight control */
+ intel_dsi->pwm = pwm_get(dev->dev, "pwm_backlight");
+ if (IS_ERR(intel_dsi->pwm)) {
+ DRM_ERROR("Faild to own the pwm chip\n");
+ intel_dsi->pwm = NULL;
+ } else if (pwm_config_alternate(intel_dsi->pwm, 0x7F, 100) < 0) {
+ DRM_ERROR("Failed to configure the pwm chip\n");
+ pwm_put(intel_dsi->pwm);
+ intel_dsi->pwm = NULL;
+ }
}
intel_encoder->type = INTEL_OUTPUT_DSI;
diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
index 8be75a7..d8ec9c1 100644
--- a/drivers/gpu/drm/i915/intel_dsi.h
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -52,6 +52,9 @@ struct intel_dsi {
/* GPIO Desc for CRC based Panel control */
struct gpio_desc *gpio_panel;
+ /* PWM chip */
+ struct pwm_device *pwm;
+
struct intel_connector *attached_connector;
/* bit mask of ports being driven */
--
2.1.0
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