tinydrm backport

Documentation/gpu/index.rst

@@ -11,6 +11,7 @@ Linux GPU Driver Developer's Guide
    drm-kms-helpers
    drm-uapi
    i915
+   tinydrm
    vga-switcheroo
    vgaarbiter
 

Documentation/gpu/tinydrm.rst

@@ -0,0 +1,42 @@
+==========================
+drm/tinydrm Driver library
+==========================
+
+.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-core.c
+   :doc: overview
+
+Core functionality
+==================
+
+.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-core.c
+   :doc: core
+
+.. kernel-doc:: include/drm/tinydrm/tinydrm.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-core.c
+   :export:
+
+.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
+   :export:
+
+Additional helpers
+==================
+
+.. kernel-doc:: include/drm/tinydrm/tinydrm-helpers.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
+   :export:
+
+MIPI DBI Compatible Controllers
+===============================
+
+.. kernel-doc:: drivers/gpu/drm/tinydrm/mipi-dbi.c
+   :doc: overview
+
+.. kernel-doc:: include/drm/tinydrm/mipi-dbi.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/tinydrm/mipi-dbi.c
+   :export:

MAINTAINERS

@@ -4151,6 +4151,12 @@ S:	Supported
 F:	drivers/gpu/drm/mediatek/
 F:	Documentation/devicetree/bindings/display/mediatek/
 
+DRM DRIVER FOR MI0283QT
+M:	Noralf Trønnes <noralf@tronnes.org>
+S:	Maintained
+F:	drivers/gpu/drm/tinydrm/mi0283qt.c
+F:	Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt
+
 DRM DRIVER FOR MSM ADRENO GPU
 M:	Rob Clark <robdclark@gmail.com>
 L:	linux-arm-msm@vger.kernel.org
@@ -4193,6 +4199,12 @@ M:	Dave Airlie <airlied@redhat.com>
 S:	Odd Fixes
 F:	drivers/gpu/drm/mgag200/
 
+DRM DRIVER FOR PERVASIVE DISPLAYS REPAPER PANELS
+M:	Noralf Trønnes <noralf@tronnes.org>
+S:	Maintained
+F:	drivers/gpu/drm/tinydrm/repaper.c
+F:	Documentation/devicetree/bindings/display/repaper.txt
+
 DRM DRIVER FOR RAGE 128 VIDEO CARDS
 S:	Orphan / Obsolete
 F:	drivers/gpu/drm/r128/

arch/arm/boot/dts/overlays/Makefile

@@ -64,6 +64,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	mmc.dtbo \
 	mpu6050.dtbo \
 	mz61581.dtbo \
+	papirus.dtbo \
 	pi3-act-led.dtbo \
 	pi3-disable-bt.dtbo \
 	pi3-disable-wifi.dtbo \

arch/arm/boot/dts/overlays/README

@@ -1001,6 +1001,17 @@ Params: speed                   Display SPI bus speed
         xohms                   Touchpanel sensitivity (X-plate resistance)
 
 
+Name:   papirus
+Info:   PaPiRus ePaper Screen by Pi Supply (both HAT and pHAT)
+Load:   dtoverlay=papirus,<param>=<val>
+Params: panel                   Display panel (required):
+                                1.44": e1144cs021
+                                2.0":  e2200cs021
+                                2.7":  e2271cs021
+
+        speed                   Display SPI bus speed
+
+
 [ The pcf2127-rtc overlay has been deleted. See i2c-rtc. ]
 
 

arch/arm/boot/dts/overlays/papirus-overlay.dts

@@ -0,0 +1,89 @@
+/* PaPiRus ePaper Screen by Pi Supply */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&i2c_arm>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			display_temp: lm75@48 {
+				compatible = "lm75b";
+				reg = <0x48>;
+				status = "okay";
+				#thermal-sensor-cells = <0>;
+			};
+		};
+	};
+
+	fragment@1 {
+		target-path = "/";
+		__overlay__ {
+			thermal-zones {
+				display {
+					polling-delay-passive = <0>;
+					polling-delay = <0>;
+					thermal-sensors = <&display_temp>;
+				};
+			};
+		};
+	};
+
+	fragment@2 {
+		target = <&spi0>;
+		__overlay__ {
+			status = "okay";
+
+			spidev@0{
+				status = "disabled";
+			};
+		};
+	};
+
+	fragment@3 {
+		target = <&gpio>;
+		__overlay__ {
+			repaper_pins: repaper_pins {
+				brcm,pins = <14 15 23 24 25>;
+				brcm,function = <1 1 1 1 0>; /* out out out out in */
+			};
+		};
+	};
+
+	fragment@4 {
+		target = <&spi0>;
+		__overlay__ {
+			/* needed to avoid dtc warning */
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			repaper: repaper@0{
+				compatible = "not_set";
+				reg = <0>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&repaper_pins>;
+
+				spi-max-frequency = <8000000>;
+
+				panel-on-gpios = <&gpio 23 0>;
+				border-gpios = <&gpio 14 0>;
+				discharge-gpios = <&gpio 15 0>;
+				reset-gpios = <&gpio 24 0>;
+				busy-gpios = <&gpio 25 0>;
+
+				repaper-thermal-zone = "display";
+			};
+		};
+	};
+
+	__overrides__ {
+		panel = <&repaper>, "compatible";
+		speed = <&repaper>, "spi-max-frequency:0";
+	};
+};

arch/arm/configs/bcm2709_defconfig

@@ -847,6 +847,9 @@ CONFIG_DRM_UDL=m
 CONFIG_DRM_PANEL_SIMPLE=m
 CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN=m
 CONFIG_DRM_VC4=m
+CONFIG_DRM_TINYDRM=m
+CONFIG_TINYDRM_MI0283QT=m
+CONFIG_TINYDRM_REPAPER=m
 CONFIG_FB=y
 CONFIG_FB_BCM2708=y
 CONFIG_FB_UDL=m

arch/arm/configs/bcmrpi_defconfig

@@ -841,6 +841,9 @@ CONFIG_DRM_UDL=m
 CONFIG_DRM_PANEL_SIMPLE=m
 CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN=m
 CONFIG_DRM_VC4=m
+CONFIG_DRM_TINYDRM=m
+CONFIG_TINYDRM_MI0283QT=m
+CONFIG_TINYDRM_REPAPER=m
 CONFIG_FB=y
 CONFIG_FB_BCM2708=y
 CONFIG_FB_UDL=m

drivers/gpu/drm/Kconfig

@@ -223,6 +223,8 @@ source "drivers/gpu/drm/hisilicon/Kconfig"
 
 source "drivers/gpu/drm/mediatek/Kconfig"
 
+source "drivers/gpu/drm/tinydrm/Kconfig"
+
 # Keep legacy drivers last
 
 menuconfig DRM_LEGACY

drivers/gpu/drm/Makefile

@@ -86,3 +86,4 @@ obj-$(CONFIG_DRM_FSL_DCU) += fsl-dcu/
 obj-$(CONFIG_DRM_ETNAVIV) += etnaviv/
 obj-$(CONFIG_DRM_ARCPGU)+= arc/
 obj-y			+= hisilicon/
+obj-$(CONFIG_DRM_TINYDRM) += tinydrm/

drivers/gpu/drm/drm_debugfs.c

@@ -79,7 +79,8 @@ static const struct file_operations drm_debugfs_fops = {
  * \return Zero on success, non-zero on failure
  *
  * Create a given set of debugfs files represented by an array of
- * gdm_debugfs_lists in the given root directory.
+ * &drm_info_list in the given root directory. These files will be removed
+ * automatically on drm_debugfs_cleanup().
  */
 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
 			     struct dentry *root, struct drm_minor *minor)
@@ -208,6 +209,19 @@ int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
 }
 EXPORT_SYMBOL(drm_debugfs_remove_files);
 
+static void drm_debugfs_remove_all_files(struct drm_minor *minor)
+{
+	struct drm_info_node *node, *tmp;
+
+	mutex_lock(&minor->debugfs_lock);
+	list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
+		debugfs_remove(node->dent);
+		list_del(&node->list);
+		kfree(node);
+	}
+	mutex_unlock(&minor->debugfs_lock);
+}
+
 /**
  * Cleanup the debugfs filesystem resources.
  *
@@ -226,9 +240,9 @@ int drm_debugfs_cleanup(struct drm_minor *minor)
 	if (dev->driver->debugfs_cleanup)
 		dev->driver->debugfs_cleanup(minor);
 
-	drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
+	drm_debugfs_remove_all_files(minor);
 
-	debugfs_remove(minor->debugfs_root);
+	debugfs_remove_recursive(minor->debugfs_root);
 	minor->debugfs_root = NULL;
 
 	return 0;

drivers/gpu/drm/tinydrm/Kconfig

@@ -0,0 +1,33 @@
+menuconfig DRM_TINYDRM
+	tristate "Support for simple displays"
+	depends on DRM
+	select DRM_KMS_HELPER
+	select DRM_KMS_CMA_HELPER
+	select BACKLIGHT_LCD_SUPPORT
+	select BACKLIGHT_CLASS_DEVICE
+	help
+	  Choose this option if you have a tinydrm supported display.
+	  If M is selected the module will be called tinydrm.
+
+config TINYDRM_MIPI_DBI
+	tristate
+
+config TINYDRM_MI0283QT
+	tristate "DRM support for MI0283QT"
+	depends on DRM_TINYDRM && SPI
+	select TINYDRM_MIPI_DBI
+	help
+	  DRM driver for the Multi-Inno MI0283QT display panel
+	  If M is selected the module will be called mi0283qt.
+
+config TINYDRM_REPAPER
+	tristate "DRM support for Pervasive Displays RePaper panels (V231)"
+	depends on DRM_TINYDRM && SPI
+	help
+	  DRM driver for the following Pervasive Displays panels:
+	  1.44" TFT EPD Panel (E1144CS021)
+	  1.90" TFT EPD Panel (E1190CS021)
+	  2.00" TFT EPD Panel (E2200CS021)
+	  2.71" TFT EPD Panel (E2271CS021)
+
+	  If M is selected the module will be called repaper.

drivers/gpu/drm/tinydrm/Makefile

@@ -0,0 +1,8 @@
+obj-$(CONFIG_DRM_TINYDRM)		+= core/
+
+# Controllers
+obj-$(CONFIG_TINYDRM_MIPI_DBI)		+= mipi-dbi.o
+
+# Displays
+obj-$(CONFIG_TINYDRM_MI0283QT)		+= mi0283qt.o
+obj-$(CONFIG_TINYDRM_REPAPER)		+= repaper.o

drivers/gpu/drm/tinydrm/core/Makefile

@@ -0,0 +1,3 @@
+tinydrm-y := tinydrm-core.o tinydrm-pipe.o tinydrm-helpers.o
+
+obj-$(CONFIG_DRM_TINYDRM) += tinydrm.o