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drm/i915: Make downclock deduction common for all panels

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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>
This commit is contained in:
Vandana Kannan
2013-12-10 13:37:36 +05:30
committed by Daniel Vetter
parent c461562e84
commit ec9ed1976c
3 changed files with 78 additions and 54 deletions
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57
drivers/gpu/drm/i915/intel_panel.c
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@@ -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);
}