struct drm_device;
struct drm_dp_aux;
+struct drm_panel;
/*
* Unless otherwise noted, all values are from the DP 1.1a spec. Note that
DP_MSA_TIMING_PAR_IGNORED;
}
+/**
+ * drm_edp_backlight_supported() - Check an eDP DPCD for VESA backlight support
+ * @edp_dpcd: The DPCD to check
+ *
+ * Note that currently this function will return %false for panels which support various DPCD
+ * backlight features but which require the brightness be set through PWM, and don't support setting
+ * the brightness level via the DPCD. This is a TODO.
+ *
+ * Returns: %True if @edp_dpcd indicates that VESA backlight controls are supported, %false
+ * otherwise
+ */
+static inline bool
+drm_edp_backlight_supported(const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE])
+{
+ return (edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP) &&
+ (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP);
+}
+
/*
* DisplayPort AUX channel
*/
/**
* struct drm_dp_aux - DisplayPort AUX channel
- * @name: user-visible name of this AUX channel and the I2C-over-AUX adapter
- * @ddc: I2C adapter that can be used for I2C-over-AUX communication
- * @dev: pointer to struct device that is the parent for this AUX channel
- * @drm_dev: pointer to the &drm_device that owns this AUX channel. Beware, this
- * may be %NULL before drm_dp_aux_register() has been called.
- * @crtc: backpointer to the crtc that is currently using this AUX channel
- * @hw_mutex: internal mutex used for locking transfers
- * @crc_work: worker that captures CRCs for each frame
- * @crc_count: counter of captured frame CRCs
- * @transfer: transfers a message representing a single AUX transaction
- *
- * The @dev field should be set to a pointer to the device that implements the
- * AUX channel. As well, the @drm_dev field should be set to the &drm_device
- * that will be using this AUX channel as early as possible. For many graphics
- * drivers this should happen before drm_dp_aux_init(), however it's perfectly
- * fine to set this field later so long as it's assigned before calling
- * drm_dp_aux_register().
- *
- * The @name field may be used to specify the name of the I2C adapter. If set to
- * %NULL, dev_name() of @dev will be used.
- *
- * Drivers provide a hardware-specific implementation of how transactions are
- * executed via the @transfer() function. A pointer to a &drm_dp_aux_msg
- * structure describing the transaction is passed into this function. Upon
- * success, the implementation should return the number of payload bytes that
- * were transferred, or a negative error-code on failure. Helpers propagate
- * errors from the @transfer() function, with the exception of the %-EBUSY
- * error, which causes a transaction to be retried. On a short, helpers will
- * return %-EPROTO to make it simpler to check for failure.
*
* An AUX channel can also be used to transport I2C messages to a sink. A
* typical application of that is to access an EDID that's present in the sink
* transfers by default; if a partial response is received, the adapter will
* drop down to the size given by the partial response for this transaction
* only.
- *
- * Note that the aux helper code assumes that the @transfer() function only
- * modifies the reply field of the &drm_dp_aux_msg structure. The retry logic
- * and i2c helpers assume this is the case.
*/
struct drm_dp_aux {
+ /**
+ * @name: user-visible name of this AUX channel and the
+ * I2C-over-AUX adapter.
+ *
+ * It's also used to specify the name of the I2C adapter. If set
+ * to %NULL, dev_name() of @dev will be used.
+ */
const char *name;
+
+ /**
+ * @ddc: I2C adapter that can be used for I2C-over-AUX
+ * communication
+ */
struct i2c_adapter ddc;
+
+ /**
+ * @dev: pointer to struct device that is the parent for this
+ * AUX channel.
+ */
struct device *dev;
+
+ /**
+ * @drm_dev: pointer to the &drm_device that owns this AUX channel.
+ * Beware, this may be %NULL before drm_dp_aux_register() has been
+ * called.
+ *
+ * It should be set to the &drm_device that will be using this AUX
+ * channel as early as possible. For many graphics drivers this should
+ * happen before drm_dp_aux_init(), however it's perfectly fine to set
+ * this field later so long as it's assigned before calling
+ * drm_dp_aux_register().
+ */
struct drm_device *drm_dev;
+
+ /**
+ * @crtc: backpointer to the crtc that is currently using this
+ * AUX channel
+ */
struct drm_crtc *crtc;
+
+ /**
+ * @hw_mutex: internal mutex used for locking transfers.
+ *
+ * Note that if the underlying hardware is shared among multiple
+ * channels, the driver needs to do additional locking to
+ * prevent concurrent access.
+ */
struct mutex hw_mutex;
+
+ /**
+ * @crc_work: worker that captures CRCs for each frame
+ */
struct work_struct crc_work;
+
+ /**
+ * @crc_count: counter of captured frame CRCs
+ */
u8 crc_count;
+
+ /**
+ * @transfer: transfers a message representing a single AUX
+ * transaction.
+ *
+ * This is a hardware-specific implementation of how
+ * transactions are executed that the drivers must provide.
+ *
+ * A pointer to a &drm_dp_aux_msg structure describing the
+ * transaction is passed into this function. Upon success, the
+ * implementation should return the number of payload bytes that
+ * were transferred, or a negative error-code on failure.
+ *
+ * Helpers will propagate these errors, with the exception of
+ * the %-EBUSY error, which causes a transaction to be retried.
+ * On a short, helpers will return %-EPROTO to make it simpler
+ * to check for failure.
+ *
+ * The @transfer() function must only modify the reply field of
+ * the &drm_dp_aux_msg structure. The retry logic and i2c
+ * helpers assume this is the case.
+ *
+ * Also note that this callback can be called no matter the
+ * state @dev is in. Drivers that need that device to be powered
+ * to perform this operation will first need to make sure it's
+ * been properly enabled.
+ */
ssize_t (*transfer)(struct drm_dp_aux *aux,
struct drm_dp_aux_msg *msg);
+
/**
* @i2c_nack_count: Counts I2C NACKs, used for DP validation.
*/
return desc->quirks & BIT(quirk);
}
+/**
+ * struct drm_edp_backlight_info - Probed eDP backlight info struct
+ * @pwmgen_bit_count: The pwmgen bit count
+ * @pwm_freq_pre_divider: The PWM frequency pre-divider value being used for this backlight, if any
+ * @max: The maximum backlight level that may be set
+ * @lsb_reg_used: Do we also write values to the DP_EDP_BACKLIGHT_BRIGHTNESS_LSB register?
+ * @aux_enable: Does the panel support the AUX enable cap?
+ *
+ * This structure contains various data about an eDP backlight, which can be populated by using
+ * drm_edp_backlight_init().
+ */
+struct drm_edp_backlight_info {
+ u8 pwmgen_bit_count;
+ u8 pwm_freq_pre_divider;
+ u16 max;
+
+ bool lsb_reg_used : 1;
+ bool aux_enable : 1;
+};
+
+int
+drm_edp_backlight_init(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl,
+ u16 driver_pwm_freq_hz, const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE],
+ u16 *current_level, u8 *current_mode);
+int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl,
+ u16 level);
+int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl,
+ u16 level);
+int drm_edp_backlight_disable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl);
+
+#if IS_ENABLED(CONFIG_DRM_KMS_HELPER) && (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
+ (IS_MODULE(CONFIG_DRM_KMS_HELPER) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE)))
+
+int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux);
+
+#else
+
+static inline int drm_panel_dp_aux_backlight(struct drm_panel *panel,
+ struct drm_dp_aux *aux)
+{
+ return 0;
+}
+
+#endif
+
#ifdef CONFIG_DRM_DP_CEC
void drm_dp_cec_irq(struct drm_dp_aux *aux);
void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
projects / linux-2.6-microblaze.git / blobdiff