This driver provides support for the "crystal_cove_panel" cell device.
On BYT-T pmic has to be used to enable/disable panel.
Signed-off-by: Shobhit Kumar <shobhit.kumar@xxxxxxxxx>
---
drivers/gpu/drm/panel/Kconfig | 7 ++
drivers/gpu/drm/panel/Makefile | 1 +
drivers/gpu/drm/panel/panel-crystalcove.c | 191 ++++++++++++++++++++++++++++++
3 files changed, 199 insertions(+)
create mode 100644 drivers/gpu/drm/panel/panel-crystalcove.c
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 024e98e..d813bd1 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -40,4 +40,11 @@ config DRM_PANEL_SHARP_LQ101R1SX01
To compile this driver as a module, choose M here: the module
will be called panel-sharp-lq101r1sx01.
+config DRM_PANEL_CRYSTALCOVE
+ tristate "Crystalcove PMIC controlled panel"
+ depends on INTEL_SOC_PMIC
+ help
+ Say Y here if you want to enable support for DSI panel and backlight
+ control using crystalcove pmic. This is used for BYT CR configurations
+
endmenu
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 4b2a043..c05824e 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
obj-$(CONFIG_DRM_PANEL_LD9040) += panel-ld9040.o
obj-$(CONFIG_DRM_PANEL_S6E8AA0) += panel-s6e8aa0.o
obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
+obj-$(CONFIG_DRM_PANEL_CRYSTALCOVE) += panel-crystalcove.o
diff --git a/drivers/gpu/drm/panel/panel-crystalcove.c b/drivers/gpu/drm/panel/panel-crystalcove.c
new file mode 100644
index 0000000..22f7ff5
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-crystalcove.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright © 2006-2014 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@xxxxxxxxx>
+ */
+
+#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;
+ char name[NAME_MAX];
+ bool prepared;
+ bool enabled;
+
+ struct mutex lock;
+
+ /* 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_unprepare(struct drm_panel *panel)
+{
+ struct crystalcove_panel *p = to_crystalcove_panel(panel);
+
+ if (!p->prepared)
+ return 0;
+
+ /* Nothing needed */
+ p->prepared = false;
+
+ return 0;
+}
+
+static int crystalcove_panel_prepare(struct drm_panel *panel)
+{
+ struct crystalcove_panel *p = to_crystalcove_panel(panel);
+
+ if (p->prepared)
+ return 0;
+
+ /* Nothing needed */
+ p->prepared = true;
+
+ 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,
+ .unprepare = crystalcove_panel_unprepare,
+ .prepare = crystalcove_panel_prepare,
+ .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 = panel->prepared = retval ? true : false;
+
+ 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@xxxxxxxxxxxxxxx");
+MODULE_DESCRIPTION("Intel Crystal Cove Panel Driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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