> -----Original Message-----
> From: Nikula, Jani
> Sent: Monday, September 14, 2015 12:04 PM
> To: Deepak, M; Adebisi, YetundeX; intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Nikula, Jani
> Subject: [PATCH 1/1] drm/i915: make backlight hooks connector specific
>
> Previously we've relied on having basically one backlight and one
> backlight type per platform. This is already a bit quirky with PMIC PWM
> support on VLV/CHV platforms with MIPI DSI. In the foreseeable future
> we'll have at least DPCD based backlight control on eDP and DCS command
> based backlight control on MIPI DSI. Backlight is becoming more and more
> connector specific, so reflect this fact by making the backlight control
> hooks connector specific.
>
> This enables further work to reuse generic backlight code in
> intel_panel.c while adding more specific backlight code accessed via the
> hooks.
>
> Cc: Deepak M <m.deepak@xxxxxxxxx>
> Cc: Yetunde Adebisi <yetundex.adebisi@xxxxxxxxx>
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Reviewed-by: Yetunde Adebisi <yetundex.adebisi@xxxxxxxxx>
I tested it with DPCD backlight control functions and found no issues.
Regards,
Yetunde
> ---
> drivers/gpu/drm/i915/i915_drv.h | 9 ---
> drivers/gpu/drm/i915/intel_display.c | 2 -
> drivers/gpu/drm/i915/intel_dp.c | 2 +-
> drivers/gpu/drm/i915/intel_drv.h | 13 +++-
> drivers/gpu/drm/i915/intel_panel.c | 116 +++++++++++++++++++-----------
> -----
> 5 files changed, 74 insertions(+), 68 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h
> b/drivers/gpu/drm/i915/i915_drv.h
> index 174f39d0bf46..813023b438b2 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -664,15 +664,6 @@ struct drm_i915_display_funcs {
> /* render clock increase/decrease */
> /* display clock increase/decrease */
> /* pll clock increase/decrease */
> -
> - int (*setup_backlight)(struct intel_connector *connector, enum pipe
> pipe);
> - uint32_t (*get_backlight)(struct intel_connector *connector);
> - void (*set_backlight)(struct intel_connector *connector,
> - uint32_t level);
> - void (*disable_backlight)(struct intel_connector *connector);
> - void (*enable_backlight)(struct intel_connector *connector);
> - uint32_t (*backlight_hz_to_pwm)(struct intel_connector
> *connector,
> - uint32_t hz);
> };
>
> enum forcewake_domain_id {
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index fc0086748b71..15de4ccc3903 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -14520,8 +14520,6 @@ static void intel_init_display(struct drm_device
> *dev)
> dev_priv->display.queue_flip = intel_default_queue_flip;
> }
>
> - intel_panel_init_backlight_funcs(dev);
> -
> mutex_init(&dev_priv->pps_mutex);
> }
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c
> b/drivers/gpu/drm/i915/intel_dp.c
> index a6872508adec..fa1a524844d5 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -5990,7 +5990,7 @@ static bool intel_edp_init_connector(struct intel_dp
> *intel_dp,
> }
>
> intel_panel_init(&intel_connector->panel, fixed_mode,
> downclock_mode);
> - intel_connector->panel.backlight_power =
> intel_edp_backlight_power;
> + intel_connector->panel.backlight.power =
> intel_edp_backlight_power;
> intel_panel_setup_backlight(connector, pipe);
>
> return true;
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index 02a755a50a96..35a65ca105b3 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -182,9 +182,17 @@ struct intel_panel {
> struct pwm_device *pwm;
>
> struct backlight_device *device;
> - } backlight;
>
> - void (*backlight_power)(struct intel_connector *, bool enable);
> + /* Connector and platform specific backlight functions */
> + int (*setup)(struct intel_connector *connector, enum pipe
> pipe);
> + uint32_t (*get)(struct intel_connector *connector);
> + void (*set)(struct intel_connector *connector, uint32_t
> level);
> + void (*disable)(struct intel_connector *connector);
> + void (*enable)(struct intel_connector *connector);
> + uint32_t (*hz_to_pwm)(struct intel_connector *connector,
> + uint32_t hz);
> + void (*power)(struct intel_connector *, bool enable);
> + } backlight;
> };
>
> struct intel_connector {
> @@ -1322,7 +1330,6 @@ int intel_panel_setup_backlight(struct
> drm_connector *connector, enum pipe pipe)
> void intel_panel_enable_backlight(struct intel_connector *connector);
> void intel_panel_disable_backlight(struct intel_connector *connector);
> void intel_panel_destroy_backlight(struct drm_connector *connector);
> -void intel_panel_init_backlight_funcs(struct drm_device *dev);
> enum drm_connector_status intel_panel_detect(struct drm_device *dev);
> extern struct drm_display_mode *intel_find_panel_downclock(
> struct drm_device *dev,
> diff --git a/drivers/gpu/drm/i915/intel_panel.c
> b/drivers/gpu/drm/i915/intel_panel.c
> index 2034438a0664..9adb62b1b99f 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -566,7 +566,7 @@ static u32 intel_panel_get_backlight(struct
> intel_connector *connector)
> mutex_lock(&dev_priv->backlight_lock);
>
> if (panel->backlight.enabled) {
> - val = dev_priv->display.get_backlight(connector);
> + val = panel->backlight.get(connector);
> val = intel_panel_compute_brightness(connector, val);
> }
>
> @@ -655,13 +655,12 @@ static void pwm_set_backlight(struct
> intel_connector *connector, u32 level)
> static void
> intel_panel_actually_set_backlight(struct intel_connector *connector, u32
> level)
> {
> - struct drm_device *dev = connector->base.dev;
> - struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_panel *panel = &connector->panel;
>
> DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
>
> level = intel_panel_compute_brightness(connector, level);
> - dev_priv->display.set_backlight(connector, level);
> + panel->backlight.set(connector, level);
> }
>
> /* set backlight brightness to level in range [0..max], scaling wrt hw min */
> @@ -836,7 +835,7 @@ void intel_panel_disable_backlight(struct
> intel_connector *connector)
> if (panel->backlight.device)
> panel->backlight.device->props.power =
> FB_BLANK_POWERDOWN;
> panel->backlight.enabled = false;
> - dev_priv->display.disable_backlight(connector);
> + panel->backlight.disable(connector);
>
> mutex_unlock(&dev_priv->backlight_lock);
> }
> @@ -1085,7 +1084,7 @@ void intel_panel_enable_backlight(struct
> intel_connector *connector)
> panel->backlight.device-
> >props.max_brightness);
> }
>
> - dev_priv->display.enable_backlight(connector);
> + panel->backlight.enable(connector);
> panel->backlight.enabled = true;
> if (panel->backlight.device)
> panel->backlight.device->props.power =
> FB_BLANK_UNBLANK;
> @@ -1113,10 +1112,10 @@ static int
> intel_backlight_device_update_status(struct backlight_device *bd)
> * callback needs to take this into account.
> */
> if (panel->backlight.enabled) {
> - if (panel->backlight_power) {
> + if (panel->backlight.power) {
> bool enable = bd->props.power ==
> FB_BLANK_UNBLANK &&
> bd->props.brightness != 0;
> - panel->backlight_power(connector, enable);
> + panel->backlight.power(connector, enable);
> }
> } else {
> bd->props.power = FB_BLANK_POWERDOWN;
> @@ -1341,6 +1340,7 @@ static u32 get_backlight_max_vbt(struct
> intel_connector *connector)
> {
> struct drm_device *dev = connector->base.dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_panel *panel = &connector->panel;
> u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
> u32 pwm;
>
> @@ -1349,12 +1349,12 @@ static u32 get_backlight_max_vbt(struct
> intel_connector *connector)
> return 0;
> }
>
> - if (!dev_priv->display.backlight_hz_to_pwm) {
> + if (!panel->backlight.hz_to_pwm) {
> DRM_DEBUG_KMS("backlight frequency setting from VBT
> currently not supported on this platform\n");
> return 0;
> }
>
> - pwm = dev_priv->display.backlight_hz_to_pwm(connector,
> pwm_freq_hz);
> + pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
> if (!pwm) {
> DRM_DEBUG_KMS("backlight frequency conversion
> failed\n");
> return 0;
> @@ -1639,9 +1639,13 @@ int intel_panel_setup_backlight(struct
> drm_connector *connector, enum pipe pipe)
> }
> }
>
> + /* ensure intel_panel has been initialized first */
> + if (WARN_ON(!panel->backlight.setup))
> + return -ENODEV;
> +
> /* set level and max in panel struct */
> mutex_lock(&dev_priv->backlight_lock);
> - ret = dev_priv->display.setup_backlight(intel_connector, pipe);
> + ret = panel->backlight.setup(intel_connector, pipe);
> mutex_unlock(&dev_priv->backlight_lock);
>
> if (ret) {
> @@ -1673,62 +1677,66 @@ void intel_panel_destroy_backlight(struct
> drm_connector *connector)
> }
>
> /* Set up chip specific backlight functions */
> -void intel_panel_init_backlight_funcs(struct drm_device *dev)
> +static void
> +intel_panel_init_backlight_funcs(struct intel_panel *panel)
> {
> + struct intel_connector *intel_connector =
> + container_of(panel, struct intel_connector, panel);
> + struct drm_device *dev = intel_connector->base.dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
>
> if (IS_BROXTON(dev)) {
> - dev_priv->display.setup_backlight = bxt_setup_backlight;
> - dev_priv->display.enable_backlight = bxt_enable_backlight;
> - dev_priv->display.disable_backlight = bxt_disable_backlight;
> - dev_priv->display.set_backlight = bxt_set_backlight;
> - dev_priv->display.get_backlight = bxt_get_backlight;
> + panel->backlight.setup = bxt_setup_backlight;
> + panel->backlight.enable = bxt_enable_backlight;
> + panel->backlight.disable = bxt_disable_backlight;
> + panel->backlight.set = bxt_set_backlight;
> + panel->backlight.get = bxt_get_backlight;
> } else if (HAS_PCH_LPT(dev) || HAS_PCH_SPT(dev)) {
> - dev_priv->display.setup_backlight = lpt_setup_backlight;
> - dev_priv->display.enable_backlight = lpt_enable_backlight;
> - dev_priv->display.disable_backlight = lpt_disable_backlight;
> - dev_priv->display.set_backlight = lpt_set_backlight;
> - dev_priv->display.get_backlight = lpt_get_backlight;
> + panel->backlight.setup = lpt_setup_backlight;
> + panel->backlight.enable = lpt_enable_backlight;
> + panel->backlight.disable = lpt_disable_backlight;
> + panel->backlight.set = lpt_set_backlight;
> + panel->backlight.get = lpt_get_backlight;
> if (HAS_PCH_LPT(dev))
> - dev_priv->display.backlight_hz_to_pwm =
> lpt_hz_to_pwm;
> + panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
> else
> - dev_priv->display.backlight_hz_to_pwm =
> spt_hz_to_pwm;
> + panel->backlight.hz_to_pwm = spt_hz_to_pwm;
> } else if (HAS_PCH_SPLIT(dev)) {
> - dev_priv->display.setup_backlight = pch_setup_backlight;
> - dev_priv->display.enable_backlight = pch_enable_backlight;
> - dev_priv->display.disable_backlight = pch_disable_backlight;
> - dev_priv->display.set_backlight = pch_set_backlight;
> - dev_priv->display.get_backlight = pch_get_backlight;
> - dev_priv->display.backlight_hz_to_pwm = pch_hz_to_pwm;
> + panel->backlight.setup = pch_setup_backlight;
> + panel->backlight.enable = pch_enable_backlight;
> + panel->backlight.disable = pch_disable_backlight;
> + panel->backlight.set = pch_set_backlight;
> + panel->backlight.get = pch_get_backlight;
> + panel->backlight.hz_to_pwm = pch_hz_to_pwm;
> } else if (IS_VALLEYVIEW(dev)) {
> if (dev_priv->vbt.has_mipi) {
> - dev_priv->display.setup_backlight =
> pwm_setup_backlight;
> - dev_priv->display.enable_backlight =
> pwm_enable_backlight;
> - dev_priv->display.disable_backlight =
> pwm_disable_backlight;
> - dev_priv->display.set_backlight =
> pwm_set_backlight;
> - dev_priv->display.get_backlight =
> pwm_get_backlight;
> + panel->backlight.setup = pwm_setup_backlight;
> + panel->backlight.enable = pwm_enable_backlight;
> + panel->backlight.disable = pwm_disable_backlight;
> + panel->backlight.set = pwm_set_backlight;
> + panel->backlight.get = pwm_get_backlight;
> } else {
> - dev_priv->display.setup_backlight =
> vlv_setup_backlight;
> - dev_priv->display.enable_backlight =
> vlv_enable_backlight;
> - dev_priv->display.disable_backlight =
> vlv_disable_backlight;
> - dev_priv->display.set_backlight = vlv_set_backlight;
> - dev_priv->display.get_backlight = vlv_get_backlight;
> - dev_priv->display.backlight_hz_to_pwm =
> vlv_hz_to_pwm;
> + panel->backlight.setup = vlv_setup_backlight;
> + panel->backlight.enable = vlv_enable_backlight;
> + panel->backlight.disable = vlv_disable_backlight;
> + panel->backlight.set = vlv_set_backlight;
> + panel->backlight.get = vlv_get_backlight;
> + panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
> }
> } else if (IS_GEN4(dev)) {
> - dev_priv->display.setup_backlight = i965_setup_backlight;
> - dev_priv->display.enable_backlight = i965_enable_backlight;
> - dev_priv->display.disable_backlight = i965_disable_backlight;
> - dev_priv->display.set_backlight = i9xx_set_backlight;
> - dev_priv->display.get_backlight = i9xx_get_backlight;
> - dev_priv->display.backlight_hz_to_pwm = i965_hz_to_pwm;
> + panel->backlight.setup = i965_setup_backlight;
> + panel->backlight.enable = i965_enable_backlight;
> + panel->backlight.disable = i965_disable_backlight;
> + panel->backlight.set = i9xx_set_backlight;
> + panel->backlight.get = i9xx_get_backlight;
> + panel->backlight.hz_to_pwm = i965_hz_to_pwm;
> } else {
> - dev_priv->display.setup_backlight = i9xx_setup_backlight;
> - dev_priv->display.enable_backlight = i9xx_enable_backlight;
> - dev_priv->display.disable_backlight = i9xx_disable_backlight;
> - dev_priv->display.set_backlight = i9xx_set_backlight;
> - dev_priv->display.get_backlight = i9xx_get_backlight;
> - dev_priv->display.backlight_hz_to_pwm = i9xx_hz_to_pwm;
> + panel->backlight.setup = i9xx_setup_backlight;
> + panel->backlight.enable = i9xx_enable_backlight;
> + panel->backlight.disable = i9xx_disable_backlight;
> + panel->backlight.set = i9xx_set_backlight;
> + panel->backlight.get = i9xx_get_backlight;
> + panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
> }
> }
>
> @@ -1736,6 +1744,8 @@ int intel_panel_init(struct intel_panel *panel,
> struct drm_display_mode *fixed_mode,
> struct drm_display_mode *downclock_mode)
> {
> + intel_panel_init_backlight_funcs(panel);
> +
> panel->fixed_mode = fixed_mode;
> panel->downclock_mode = downclock_mode;
>
> --
> 2.1.4
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