drm/starfive: Add StarFive drm driver

Add starfive DRM Display driver framework

Signed-off-by: jack.zhu <jack.zhu@starfivetech.com>
Signed-off-by: keith.zhao <keith.zhao@starfivetech.com>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Link: https://lore.kernel.org/r/a8ca722539672d6369d6e4092e1e08cb6b58c546.1645535955.git.geert@linux-m68k.org
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>

Author: sw.multimedia

drivers/cache/sifive_ccache.c

@@ -159,6 +159,12 @@ static void ccache_flush_range(phys_addr_t start, size_t len)
 	}
 }
 
+void sifive_ccache_flush_range(phys_addr_t start, size_t len)
+{
+	ccache_flush_range(start, len);
+}
+EXPORT_SYMBOL_GPL(sifive_ccache_flush_range);
+
 static const struct riscv_nonstd_cache_ops ccache_mgmt_ops __initconst = {
 	.wback = &ccache_flush_range,
 	.inv = &ccache_flush_range,

drivers/gpu/drm/Kconfig

@@ -322,6 +322,8 @@ source "drivers/gpu/drm/renesas/Kconfig"
 
 source "drivers/gpu/drm/sun4i/Kconfig"
 
+source "drivers/gpu/drm/starfive/Kconfig"
+
 source "drivers/gpu/drm/omapdrm/Kconfig"
 
 source "drivers/gpu/drm/tilcdc/Kconfig"

drivers/gpu/drm/Makefile

@@ -163,6 +163,7 @@ obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel-hlcdc/
 obj-y			+= renesas/
 obj-y			+= omapdrm/
 obj-$(CONFIG_DRM_SUN4I) += sun4i/
+obj-$(CONFIG_DRM_STARFIVE) += starfive/
 obj-y			+= tilcdc/
 obj-$(CONFIG_DRM_QXL) += qxl/
 obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/

drivers/gpu/drm/starfive/Kconfig

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2021 StarFive Technology Co., Ltd.
+
+config DRM_STARFIVE
+	tristate "DRM Support for StarFive SoCs"
+	depends on DRM
+	depends on SIFIVE_CCACHE && RISCV_NONSTANDARD_CACHE_OPS
+	depends on SOC_STARFIVE || COMPILE_TEST
+	select DRM_GEM_DMA_HELPER
+	select DRM_KMS_HELPER
+	select DRM_MIPI_DSI
+	select DRM_PANEL
+	help
+	  Choose this option if you have a StarFive SoCs.
+	  The module will be called starfive-drm
+	  This driver provides kernel mode setting and
+	  buffer management to userspace.

drivers/gpu/drm/starfive/Makefile

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (C) 2021 StarFive Technology Co., Ltd.
+#
+starfive-drm-y := starfive_drm_drv.o \
+		  starfive_drm_gem.o \
+		  starfive_drm_crtc.o \
+		  starfive_drm_encoder.o \
+		  starfive_drm_plane.o \
+		  starfive_drm_lcdc.o \
+		  starfive_drm_vpp.o
+
+obj-$(CONFIG_DRM_STARFIVE) += starfive-drm.o

drivers/gpu/drm/starfive/README.txt

@@ -0,0 +1,56 @@
+Display Subsystem:(default FBdev)
+
+Steps switch to DRM:
+1、Disable fbdev,close below config items：
+CONFIG_FB_STARFIVE=y
+CONFIG_FB_STARFIVE_HDMI_TDA998X=y
+CONFIG_FB_STARFIVE_VIDEO=y
+
+2、open DRM hdmi pipeline,enable items:
+CONFIG_DRM_I2C_NXP_TDA998X=y
+CONFIG_DRM_I2C_NXP_TDA9950=y
+CONFIG_DRM_STARFIVE=y
+CONFIG_FRAMEBUFFER_CONSOLE=y
+
+Precautions：when use DRM hdmi pipeline,please make sure CONFIG_DRM_STARFIVE_MIPI_DSI is disable ,
+			 or will cause color abnormal.
+
+3、open DRM mipi pipeline
+
+enable items:
+	CONFIG_PHY_M31_DPHY_RX0=y
+	CONFIG_DRM_STARFIVE_MIPI_DSI=y
+
+
+change jh7100.dtsi display-encoder as below：
+
+	display-encoder {
+		compatible = "starfive,display-encoder";
+		encoder-type = <6>; //2-TMDS, 3-LVDS, 6-DSI, 8-DPI
+		status = "okay";
+
+		ports {
+			port@0 {
+				endpoint {
+					remote-endpoint = <&dsi_out_port>;
+				};
+			};
+
+			port@1 {
+				endpoint {
+					remote-endpoint = <&crtc_0_out>;
+				};
+			};
+		};
+	};
+
+install libdrm:
+make buildroot_initramfs-menuconfig
+choose:
+BR2_PACKAGE_LIBDRM=y
+BR2_PACKAGE_LIBDRM_RADEON=y
+BR2_PACKAGE_LIBDRM_AMDGPU=y
+BR2_PACKAGE_LIBDRM_NOUVEAU=y
+BR2_PACKAGE_LIBDRM_ETNAVIV=y
+BR2_PACKAGE_LIBDRM_INSTALL_TESTS=y
+