This driver provides support for the "crystal_cove_panel" cell device. On BYT-T pmic has to be used to enable/disable panel.
v2: Addressed Jani's comments - Moved inside i915 - Correct licensing - Remove unused stuff - Do not initialize prepare/unprepare as they are not needed as of now - Correct backlight off delay
Signed-off-by: Shobhit Kumar shobhit.kumar@intel.com --- drivers/gpu/drm/i915/Kconfig | 12 ++ drivers/gpu/drm/i915/Makefile | 3 + drivers/gpu/drm/i915/intel-panel-crystalcove.c | 159 +++++++++++++++++++++++++ 3 files changed, 174 insertions(+) create mode 100644 drivers/gpu/drm/i915/intel-panel-crystalcove.c
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig index 4e39ab3..0510ef0 100644 --- a/drivers/gpu/drm/i915/Kconfig +++ b/drivers/gpu/drm/i915/Kconfig @@ -69,3 +69,15 @@ config DRM_I915_PRELIMINARY_HW_SUPPORT option changes the default for that module option.
If in doubt, say "N". + +config DRM_I915_PANEL_CRYSTALCOVE_PMIC + bool "Enable drm panel for crystal cove pmic based control" + depends on DRM_I915 + depends on DRM_PANEL + default n + help + Choose this option if you have BYT-T based device with DSI panel. On + BYT-T there a crystal cove PMIC which controls the PANEL EN/DISABLE + signals. + + If in doubt, say "N". diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 1849ffa..cc2f10d 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -88,4 +88,7 @@ i915-y += i915_dma.o \
obj-$(CONFIG_DRM_I915) += i915.o
+# I915 DRM Panels +obj-$(CONFIG_DRM_I915_PANEL_CRYSTALCOVE_PMIC) += intel-panel-crystalcove.o + CFLAGS_i915_trace_points.o := -I$(src) diff --git a/drivers/gpu/drm/i915/intel-panel-crystalcove.c b/drivers/gpu/drm/i915/intel-panel-crystalcove.c new file mode 100644 index 0000000..a6aefa3 --- /dev/null +++ b/drivers/gpu/drm/i915/intel-panel-crystalcove.c @@ -0,0 +1,159 @@ +/* + * Copyright © 2014 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * Authors: + * Shobhit Kumar shobhit.kumar@intel.com + */ + +#include <drm/drmP.h> +#include <drm/drm_crtc.h> +#include <drm/drm_panel.h> +#include <linux/mfd/intel_soc_pmic.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#define PMIC_PANEL_EN 0x52 +#define PMIC_PWM_EN 0x51 +#define PMIC_BKL_EN 0x4B +#define PMIC_PWM_LEVEL 0x4E + +struct crystalcove_panel { + struct drm_panel base; + bool enabled; + + /* crystal cove pmic regmap */ + struct regmap *regmap; +}; + +static inline struct crystalcove_panel *to_crystalcove_panel(struct drm_panel *panel) +{ + return container_of(panel, struct crystalcove_panel, base); +} + +static int crystalcove_panel_disable(struct drm_panel *panel) +{ + struct crystalcove_panel *p = to_crystalcove_panel(panel); + + if (!p->enabled) + return 0; + + DRM_DEBUG_KMS("\n"); + + /* invoke the pmic driver */ + regmap_write(p->regmap, PMIC_PANEL_EN, 0x00); + + /* Disable backlight as well */ + regmap_write(p->regmap, PMIC_PWM_LEVEL, 0); + msleep(20); + regmap_write(p->regmap, PMIC_PWM_EN, 0x00); + regmap_write(p->regmap, PMIC_BKL_EN, 0x7F); + + p->enabled = false; + + return 0; +} + +static int crystalcove_panel_enable(struct drm_panel *panel) +{ + struct crystalcove_panel *p = to_crystalcove_panel(panel); + + if (p->enabled) + return 0; + + DRM_DEBUG_KMS("\n"); + + /* invoke the pmic driver */ + regmap_write(p->regmap, PMIC_PANEL_EN, 0x01); + + /* Enable BKL as well */ + regmap_write(p->regmap, PMIC_BKL_EN, 0xFF); + regmap_write(p->regmap, PMIC_PWM_EN, 0x01); + msleep(20); + regmap_write(p->regmap, PMIC_PWM_LEVEL, 255); + + p->enabled = true; + + return 0; +} + +static const struct drm_panel_funcs crystalcove_panel_funcs = { + .disable = crystalcove_panel_disable, + .enable = crystalcove_panel_enable, +}; + +static int crystalcove_panel_probe(struct platform_device *pdev) +{ + struct crystalcove_panel *panel; + int retval; + struct device *dev = pdev->dev.parent; + struct intel_soc_pmic *pmic = dev_get_drvdata(dev); + + panel = devm_kzalloc(&pdev->dev, sizeof(*panel), GFP_KERNEL); + if (!panel) + return -ENOMEM; + + DRM_DEBUG_KMS("\n"); + + platform_set_drvdata(pdev, panel); + + strcpy(panel->base.name, "crystal_cove_panel"); + panel->regmap = pmic->regmap; + + regmap_read(panel->regmap, PMIC_PANEL_EN, &retval); + panel->enabled = retval; + + drm_panel_init(&panel->base); + panel->base.dev = dev; + panel->base.funcs = &crystalcove_panel_funcs; + + drm_panel_add(&panel->base); + + return 0; +} + +static int crystalcove_panel_remove(struct platform_device *pdev) +{ + struct crystalcove_panel *panel = platform_get_drvdata(pdev); + + DRM_DEBUG_KMS("\n"); + + drm_panel_detach(&panel->base); + drm_panel_remove(&panel->base); + + crystalcove_panel_disable(&panel->base); + + return 0; +} + +static struct platform_driver crystalcove_panel_driver = { + .probe = crystalcove_panel_probe, + .remove = crystalcove_panel_remove, + .driver = { + .name = "crystal_cove_panel", + }, +}; + +module_platform_driver(crystalcove_panel_driver); + +MODULE_AUTHOR("Shobhit Kumar <shobhit.kumar@linux.intel.com"); +MODULE_DESCRIPTION("Intel Crystal Cove Panel Driver"); +MODULE_LICENSE("GPL and additional rights");