diff options
author | Vandana Kannan <vandana.kannan@intel.com> | 2013-12-10 13:37:36 +0530 |
---|---|---|
committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-12-10 13:26:15 +0100 |
commit | ec9ed1976c256333567932b4acced34c072b57a7 (patch) | |
tree | 642d265fb290cb612edd55b564e6972d6977222c /drivers/gpu/drm/i915/intel_panel.c | |
parent | c461562e84d180fb691af57f93a42bd9cc7eb69c (diff) | |
download | op-kernel-dev-ec9ed1976c256333567932b4acced34c072b57a7.zip op-kernel-dev-ec9ed1976c256333567932b4acced34c072b57a7.tar.gz |
drm/i915: Make downclock deduction common for all panels
If one mode of a internal panel has more than one refresh rate, then a reduced
clock is found for the LFP (LVDS/eDP). This enables switching between low
and high frequency dynamically. Moving downclock calculation to intel_panel
so that it is common for LVDS and eDP.
Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
Signed-off-by: Pradeep Bhat <pradeep.bhat@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_panel.c')
-rw-r--r-- | drivers/gpu/drm/i915/intel_panel.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index e480cf4..b0f6e6c 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -1104,6 +1104,59 @@ void intel_panel_destroy_backlight(struct drm_connector *connector) intel_backlight_device_unregister(intel_connector); } +/** + * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID + * @dev: drm device + * @fixed_mode : panel native mode + * @connector: LVDS/eDP connector + * + * Return downclock_avail + * Find the reduced downclock for LVDS/eDP in EDID. + */ +struct drm_display_mode * +intel_find_panel_downclock(struct drm_device *dev, + struct drm_display_mode *fixed_mode, + struct drm_connector *connector) +{ + struct drm_display_mode *scan, *tmp_mode; + int temp_downclock; + + temp_downclock = fixed_mode->clock; + tmp_mode = NULL; + + list_for_each_entry(scan, &connector->probed_modes, head) { + /* + * If one mode has the same resolution with the fixed_panel + * mode while they have the different refresh rate, it means + * that the reduced downclock is found. In such + * case we can set the different FPx0/1 to dynamically select + * between low and high frequency. + */ + if (scan->hdisplay == fixed_mode->hdisplay && + scan->hsync_start == fixed_mode->hsync_start && + scan->hsync_end == fixed_mode->hsync_end && + scan->htotal == fixed_mode->htotal && + scan->vdisplay == fixed_mode->vdisplay && + scan->vsync_start == fixed_mode->vsync_start && + scan->vsync_end == fixed_mode->vsync_end && + scan->vtotal == fixed_mode->vtotal) { + if (scan->clock < temp_downclock) { + /* + * The downclock is already found. But we + * expect to find the lower downclock. + */ + temp_downclock = scan->clock; + tmp_mode = scan; + } + } + } + + if (temp_downclock < fixed_mode->clock) + return drm_mode_duplicate(dev, tmp_mode); + else + return NULL; +} + /* Set up chip specific backlight functions */ void intel_panel_init_backlight_funcs(struct drm_device *dev) { @@ -1157,4 +1210,8 @@ void intel_panel_fini(struct intel_panel *panel) if (panel->fixed_mode) drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode); + + if (panel->downclock_mode) + drm_mode_destroy(intel_connector->base.dev, + panel->downclock_mode); } |