From: Lee Shawn C <shawn.c.lee@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Lee Shawn C <shawn.c.lee@intel.com>,
Ville Syrjala <ville.syrjala@linux.intel.com>,
Jani Nikula <jani.nikula@linux.intel.com>,
Vandita Kulkarni <vandita.kulkarni@intel.com>,
Cooper Chiou <cooper.chiou@intel.com>,
William Tseng <william.tseng@intel.com>
Subject: [Intel-gfx] [PATCH] drm/i915/dsi: Retrieve max brightness level from VBT
Date: Tue, 24 Aug 2021 22:00:42 +0800 [thread overview]
Message-ID: <20210824140042.3083-1-shawn.c.lee@intel.com> (raw)
In-Reply-To: <20210812154237.13911-7-shawn.c.lee@intel.com>
So far, DCS backlight driver hardcode (0xFF) for max brightness level.
MIPI DCS spec allow max 0xFFFF for set_display_brightness (51h) command.
And VBT brightness precision bits can support 8 ~ 16 bits.
We should set correct precision bits in VBT that meet panel's request.
Driver can refer to this setting then configure max brightness level
in DCS backlight driver properly.
v2: modify variable name brightness_precision_bits instead of
max_brightness_level.
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Cooper Chiou <cooper.chiou@intel.com>
Cc: William Tseng <william.tseng@intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
---
drivers/gpu/drm/i915/display/intel_bios.c | 3 +++
drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c | 8 ++++++--
drivers/gpu/drm/i915/i915_drv.h | 1 +
3 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index e86e6ed2d3bf..ccaf0a3100f7 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -483,6 +483,9 @@ parse_lfp_backlight(struct drm_i915_private *i915,
level = 255;
}
i915->vbt.backlight.min_brightness = min_level;
+
+ i915->vbt.backlight.brightness_precision_bits =
+ backlight_data->brightness_precision_bits[panel_type];
} else {
level = backlight_data->level[panel_type];
i915->vbt.backlight.min_brightness = entry->min_brightness;
diff --git a/drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c b/drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c
index 584c14c4cbd0..21ab9e1acb57 100644
--- a/drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c
@@ -147,10 +147,14 @@ static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
static int dcs_setup_backlight(struct intel_connector *connector,
enum pipe unused)
{
+ struct drm_device *dev = connector->base.dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_panel *panel = &connector->panel;
- panel->backlight.max = PANEL_PWM_MAX_VALUE;
- panel->backlight.level = PANEL_PWM_MAX_VALUE;
+ panel->backlight.max = (dev_priv->vbt.backlight.brightness_precision_bits > 8) \
+ ? (1 << dev_priv->vbt.backlight.brightness_precision_bits) - 1 \
+ : PANEL_PWM_MAX_VALUE;
+ panel->backlight.level = panel->backlight.max;
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 005b1cec7007..1b42e39a7cd4 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -706,6 +706,7 @@ struct intel_vbt_data {
struct {
u16 pwm_freq_hz;
+ u16 brightness_precision_bits;
bool present;
bool active_low_pwm;
u8 min_brightness; /* min_brightness/255 of max */
--
2.17.1
next prev parent reply other threads:[~2021-08-24 13:58 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-12 15:42 [Intel-gfx] [v4 0/7] MIPI DSI driver enhancements Lee Shawn C
2021-08-12 15:42 ` [Intel-gfx] [v4 1/7] drm/i915/dsi: send correct gpio_number on gen11 platform Lee Shawn C
2021-08-12 15:42 ` [Intel-gfx] [v4 2/7] drm/i915/jsl: program DSI panel GPIOs Lee Shawn C
2021-08-23 12:06 ` Jani Nikula
2021-08-12 15:42 ` [Intel-gfx] [v4 3/7] drm/i915/dsi: wait for header and payload credit available Lee Shawn C
2021-08-26 5:54 ` Kulkarni, Vandita
2021-08-12 15:42 ` [Intel-gfx] [v4 4/7] drm/i915/dsi: refine send MIPI DCS command sequence Lee Shawn C
2021-08-23 9:45 ` Kulkarni, Vandita
2021-08-12 15:42 ` [Intel-gfx] [v4 5/7] drm/i915: Get proper min cdclk if vDSC enabled Lee Shawn C
2021-08-23 12:19 ` Kulkarni, Vandita
2021-08-12 15:42 ` [Intel-gfx] [v4 6/7] drm/i915/dsi: Retrieve max brightness level from VBT Lee Shawn C
2021-08-23 8:46 ` Kulkarni, Vandita
2021-08-23 9:03 ` Lee, Shawn C
2021-08-23 12:10 ` Kulkarni, Vandita
2021-08-24 14:00 ` Lee Shawn C [this message]
2021-08-24 14:33 ` [Intel-gfx] [PATCH] " Jani Nikula
2021-08-24 15:53 ` Lee, Shawn C
2021-08-12 15:42 ` [Intel-gfx] [v4 7/7] drm/i915/dsi: Send proper brightness value via MIPI DCS command Lee Shawn C
2021-08-12 23:22 ` kernel test robot
2021-08-13 2:46 ` [Intel-gfx] [v4] " Lee Shawn C
2021-08-18 11:10 ` Jani Nikula
2021-08-18 14:58 ` Lee, Shawn C
2021-08-19 11:16 ` [Intel-gfx] [v4] drm/i915/dsi: Read/write " Lee Shawn C
2021-08-12 20:56 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for MIPI DSI driver enhancements (rev5) Patchwork
2021-08-12 20:57 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-08-12 21:26 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-08-13 2:29 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
2021-08-13 2:56 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for MIPI DSI driver enhancements (rev6) Patchwork
2021-08-13 2:58 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-08-13 3:24 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-08-13 7:56 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
2021-08-19 11:45 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for MIPI DSI driver enhancements (rev7) Patchwork
2021-08-19 11:46 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-08-19 12:09 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-08-19 13:41 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
2021-08-24 19:11 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for MIPI DSI driver enhancements (rev8) Patchwork
2021-08-24 19:12 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-08-24 19:41 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-08-25 1:22 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
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