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drm/msm: fix brightness level mapping

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The current brightness level mapping does not correctly map the
brightness level range from user space to the range supported by the
panel.

For example if the max user brightness reported is 4095, and panel
backlight range is 0-255. Then user is expected to be able to set
brightness in range from 0-4095, but current logic truncates at
bl-max (255). Moreover it doesn't take into account bl-min.

Fix logic such that the brightness range set by user correctly scales to
the backlight level from panel.

Bug: 139263611
Change-Id: Ic70909af63fb5b66ebc1434477f2fc41a785ce1f
Signed-off-by: Adrian Salido <salidoa@google.com>
This commit is contained in:
Adrian Salido 2017-07-18 16:36:31 -07:00 committed by Giovanni Ricca
parent 97635aec45
commit dd4123dba7
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1 changed files with 11 additions and 7 deletions
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18
techpack/display/msm/sde/sde_connector.c
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@ -115,17 +115,21 @@ static int sde_backlight_device_update_status(struct backlight_device *bd)
brightness = 0;
display = (struct dsi_display *) c_conn->display;
if (brightness > display->panel->bl_config.bl_max_level)
brightness = display->panel->bl_config.bl_max_level;
if (brightness > display->panel->bl_config.brightness_max_level)
brightness = display->panel->bl_config.brightness_max_level;
if (brightness > c_conn->thermal_max_brightness)
brightness = c_conn->thermal_max_brightness;
/* map UI brightness into driver backlight level with rounding */
bl_lvl = mult_frac(brightness, display->panel->bl_config.bl_max_level,
display->panel->bl_config.brightness_max_level);
if (brightness) {
int bl_min = display->panel->bl_config.bl_min_level ? : 1;
int bl_range = display->panel->bl_config.bl_max_level - bl_min;
if (!bl_lvl && brightness)
bl_lvl = 1;
/* map UI brightness into driver backlight level rounding it */
bl_lvl = bl_min + DIV_ROUND_CLOSEST((brightness - 1) * bl_range,
display->panel->bl_config.brightness_max_level - 1);
} else {
bl_lvl = 0;
}
if (!display->panel->bl_config.allow_bl_update) {
display->panel->bl_config.unset_bl_level = bl_lvl;