Framebuffer driver for the Freescale SoC Display Controller.
Change in V2:
- Use the native-mode timing as default.
- Add to_fsl_private().
Xiubo Li (4):
video: fsl-dcfb: Add dcfb framebuffer driver for LS1021A platform
video: fsl-dcfb: Add devicetree binding support
ARM: ls1021a: dtsi: Add dt node support for dcfb.
ARM: ls1021a: dts: Add and enable dt node for dcfb.
.../devicetree/bindings/video/fsl,dcfb.txt | 52 ++
arch/arm/boot/dts/ls1021a-twr.dts | 26 +
arch/arm/boot/dts/ls1021a.dtsi | 10 +
drivers/video/fbdev/Kconfig | 19 +
drivers/video/fbdev/Makefile | 1 +
drivers/video/fbdev/fsl-dcfb.c | 814 +++++++++++++++++++++
6 files changed, 922 insertions(+)
create mode 100644 Documentation/devicetree/bindings/video/fsl,dcfb.txt
create mode 100644 drivers/video/fbdev/fsl-dcfb.c
--
2.1.0.27.g96db324
On LS1021A SoC, the dcfb device is in BE mode.
Signed-off-by: Xiubo Li <[email protected]>
---
arch/arm/boot/dts/ls1021a.dtsi | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/arm/boot/dts/ls1021a.dtsi b/arch/arm/boot/dts/ls1021a.dtsi
index c70bb27..740a04e 100644
--- a/arch/arm/boot/dts/ls1021a.dtsi
+++ b/arch/arm/boot/dts/ls1021a.dtsi
@@ -383,6 +383,16 @@
<&platform_clk 1>;
};
+ dcfb: dcfb@2ce0000 {
+ compatible = "fsl,ls1021a-dcfb";
+ reg = <0x0 0x2ce0000 0x0 0x10000>;
+ clocks = <&platform_clk 0>;
+ clock-names = "dcfb";
+ scfg-controller = <&scfg>;
+ big-endian;
+ status = "disabled";
+ };
+
mdio0: mdio@2d24000 {
compatible = "gianfar";
device_type = "mdio";
--
2.1.0.27.g96db324
Add devicetree binding support for fsl-dcfb framebuffer driver. It
uses the generic display bindings and helper functions.
Signed-off-by: Xiubo Li <[email protected]>
---
.../devicetree/bindings/video/fsl,dcfb.txt | 52 ++++++++++++++++++++++
1 file changed, 52 insertions(+)
create mode 100644 Documentation/devicetree/bindings/video/fsl,dcfb.txt
diff --git a/Documentation/devicetree/bindings/video/fsl,dcfb.txt b/Documentation/devicetree/bindings/video/fsl,dcfb.txt
new file mode 100644
index 0000000..2f3d02b
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/fsl,dcfb.txt
@@ -0,0 +1,52 @@
+* Freescale Simple Display Controller FB Driver
+
+=== For dcfb node ===
+Required properties:
+- compatible: Should be one of "fsl,ls1021a-dcfb".
+- reg: Address and length of the register set for dcfb.
+- clocks: From common clock binding: handle to dcfb clock.
+- clock-names: From common clock binding: Shall be "dcfb".
+- display: The phandle to display node.
+
+Optional properties:
+- scfg-controller: The phandle of scfg node.
+
+=== For display sub-node ===
+Required properties:
+- bits-per-pixel: <16> for RGB565,
+ <24> for RGB888,
+ <32> for RGB8888.
+
+Required timing node for dispplay sub-node:
+- display-timings: Refer to binding doc display-timing.txt for details.
+
+Examples:
+dcfb: dcfb@2ce0000 {
+ compatible = "fsl,ls1021a-dcfb";
+ reg = <0x0 0x2ce0000 0x0 0x10000>;
+ clocks = <&platform_clk 0>;
+ clock-names = "dcfb";
+ scfg-controller = <&scfg>;
+ display = <&display>;
+
+ display: display@0 {
+ bits-per-pixel = <24>;
+
+ display-timings {
+ native-mode = <&timing0>;
+ timing0: nl4827hc19 {
+ clock-frequency = <10870000>;
+ hactive = <480>;
+ vactive = <272>;
+ hback-porch = <2>;
+ hfront-porch = <2>;
+ vback-porch = <1>;
+ vfront-porch = <1>;
+ hsync-len = <41>;
+ vsync-len = <2>;
+ hsync-active = <1>;
+ vsync-active = <1>;
+ };
+ };
+ };
+};
--
2.1.0.27.g96db324
On LS1021A TWR board, the TFT LCD panel is WQVGA "480x272", and
the bpp is 24.
Signed-off-by: Xiubo Li <[email protected]>
---
arch/arm/boot/dts/ls1021a-twr.dts | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/arch/arm/boot/dts/ls1021a-twr.dts b/arch/arm/boot/dts/ls1021a-twr.dts
index a2c591e..3602286 100644
--- a/arch/arm/boot/dts/ls1021a-twr.dts
+++ b/arch/arm/boot/dts/ls1021a-twr.dts
@@ -58,6 +58,32 @@
};
};
+&dcfb {
+ display = <&display>;
+ status = "okay";
+
+ display: display@0 {
+ bits-per-pixel = <24>;
+
+ display-timings {
+ native-mode = <&timing0>;
+ timing0: nl4827hc19 {
+ clock-frequency = <10870000>;
+ hactive = <480>;
+ vactive = <272>;
+ hback-porch = <2>;
+ hfront-porch = <2>;
+ vback-porch = <2>;
+ vfront-porch = <2>;
+ hsync-len = <41>;
+ vsync-len = <4>;
+ hsync-active = <1>;
+ vsync-active = <1>;
+ };
+ };
+ };
+};
+
&dspi1 {
bus-num = <0>;
status = "okay";
--
2.1.0.27.g96db324
The Display Controller module is a system master that fetches graphics
stored in internal/external memory and displays them on a TFT LCD panel.
A wide range of panel sizes is supported and the timing of the interface
signals is configurable.
The dcfb has these features:
o Full RGB888 output to TFT LCD panel.
o Optional output to system memory dependent on implementation.
o Supports Programmable panel size upto a maximum of 2032x2047. The actual
resolution supported depends upon the pixel clock and bus bandwidth
available.
o Gamma correction with 8-bit resolution on each color component.
o Dedicated memory blocks to store a cursor and Color Look Up Tables(CLUTs).
o Temporal Dithering.
Signed-off-by: Xiubo Li <[email protected]>
---
drivers/video/fbdev/Kconfig | 19 +
drivers/video/fbdev/Makefile | 1 +
drivers/video/fbdev/fsl-dcfb.c | 814 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 834 insertions(+)
create mode 100644 drivers/video/fbdev/fsl-dcfb.c
diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index 4916c97..460fe39 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -1948,6 +1948,25 @@ config FB_MBX_DEBUG
If unsure, say N.
+config FB_FSL_DCFB
+ tristate "Freescale Display Control Framebuffer Support"
+ depends on FB
+ select FB_CFB_FILLRECT
+ select FB_CFB_COPYAREA
+ select FB_CFB_IMAGEBLIT
+ select FB_MODE_HELPERS
+ select VIDEOMODE_HELPERS
+ select REGMAP_MMIO
+ ---help---
+ Framebuffer driver for the Freescale SoC Display Control.
+
+ This driver is also available as a module ( = code which can be
+ inserted and removed from the running kernel whenever you want).
+ If you want to compile it as a module, say M here and read
+ <file:Documentation/kbuild/modules.txt>.
+
+ If unsure, say N.
+
config FB_FSL_DIU
tristate "Freescale DIU framebuffer support"
depends on FB && FSL_SOC
diff --git a/drivers/video/fbdev/Makefile b/drivers/video/fbdev/Makefile
index 1979aff..9015138 100644
--- a/drivers/video/fbdev/Makefile
+++ b/drivers/video/fbdev/Makefile
@@ -109,6 +109,7 @@ obj-$(CONFIG_FB_SH7760) += sh7760fb.o
obj-$(CONFIG_FB_IMX) += imxfb.o
obj-$(CONFIG_FB_S3C) += s3c-fb.o
obj-$(CONFIG_FB_S3C2410) += s3c2410fb.o
+obj-$(CONFIG_FB_FSL_DCFB) += fsl-dcfb.o
obj-$(CONFIG_FB_FSL_DIU) += fsl-diu-fb.o
obj-$(CONFIG_FB_COBALT) += cobalt_lcdfb.o
obj-$(CONFIG_FB_IBM_GXT4500) += gxt4500.o
diff --git a/drivers/video/fbdev/fsl-dcfb.c b/drivers/video/fbdev/fsl-dcfb.c
new file mode 100644
index 0000000..c3843bf
--- /dev/null
+++ b/drivers/video/fbdev/fsl-dcfb.c
@@ -0,0 +1,814 @@
+/*
+ * Copyright 2012-2014 Freescale Semiconductor, Inc.
+ *
+ * Freescale Dispaly Controller Framebuffer Driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/fb.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+#include <video/of_display_timing.h>
+#include <video/videomode.h>
+
+#define FSL_SCFG_CTRL 0x28
+#define FSL_SCFG_PIXEL_EN BIT(31)
+
+#define FSL_DCFB_MODE 0x10
+#define FSL_DCFB_BGND 0x14
+#define FSL_DCFB_FIX_SIZE 0x18
+#define FSL_DCFB_HSYN 0x1c
+#define FSL_DCFB_VSYN 0x20
+#define FSL_DCFB_SP 0x24
+#define FSL_DCFB_TS 0x28
+#define FSL_DCFB_DIV_RATIO 0x54
+#define FSL_DCFB_UPDATE 0xcc
+#define FSL_DCFB_VAR_SIZE 0x200
+#define FSL_DCFB_POS 0x204
+#define FSL_DCFB_BASE 0x208
+#define FSL_DCFB_CTRL 0x20c
+#define FSL_DCFB_CKMAX 0x210
+#define FSL_DCFB_CKMIN 0x214
+#define FSL_DCFB_FCOLOR 0x21c
+#define FSL_DCFB_BCOLOR 0x220
+#define FSL_DCFB_SKIP 0x224
+#define FSL_DCFB_MAX 0x300
+
+#define FSL_DCFB_HSYN_BP(x) ((x) << 22)
+#define FSL_DCFB_HSYN_PW(x) ((x) << 11)
+#define FSL_DCFB_HSYN_FP(x) (x)
+#define FSL_DCFB_VSYN_BP(x) ((x) << 22)
+#define FSL_DCFB_VSYN_PW(x) ((x) << 11)
+#define FSL_DCFB_VSYN_FP(x) (x)
+
+#define FSL_DCFB_SP_VS BIT(1)
+#define FSL_DCFB_SP_HS BIT(0)
+
+#define FSL_DCFB_TS_LBV(x) ((x) << 16)
+#define FSL_DCFB_TS_OBH(x) ((x) << 8)
+#define FSL_DCFB_TS_OBL(x) (x)
+
+#define FSL_DCFB_UPDATE_MODE BIT(31)
+#define FSL_DCFB_UPDATE_READREG BIT(30)
+
+#define FSL_DCFB_VAR_SIZE_H(x) ((x) << 16)
+#define FSL_DCFB_VAR_SIZE_W(x) (x)
+
+#define FSL_DCFB_POSY(x) ((x) << 16)
+#define FSL_DCFB_POSX(x) (x)
+
+#define FSL_DCFB_CTRL_EN BIT(31)
+#define FSL_DCFB_CTRL_TILE_EN BIT(30)
+#define FSL_DCFB_CTRL_DATA_SEL_CLUT BIT(29)
+#define FSL_DCFB_CTRL_SAFETY_EN BIT(28)
+#define FSL_DCFB_CTRL_TRANS(x) ((x) << 20)
+#define FSL_DCFB_CTRL_BPP(x) ((x) << 16)
+#define FSL_DCFB_CTRL_RLE_EN BIT(15)
+#define FSL_DCFB_CTRL_LUOFFS(x) ((x) << 4)
+#define FSL_DCFB_CTRL_BB_ON BIT(2)
+
+#define FSL_DCFB_CKMAX_R(x) ((x) << 16)
+#define FSL_DCFB_CKMAX_G(x) ((x) << 8)
+#define FSL_DCFB_CKMAX_B(x) (x)
+
+#define FSL_DCFB_CKMIN_R(x) ((x) << 16)
+#define FSL_DCFB_CKMIN_G(x) ((x) << 8)
+#define FSL_DCFB_CKMIN_B(x) (x)
+
+#define FSL_DCFB_TILE_SIZE_W(x) ((x) << 16)
+#define FSL_DCFB_TILE_SIZE_H(x) (x)
+
+#define FSL_DCFB_FCOLOR_OFF(x) (x)
+#define FSL_DCFB_BCOLOR_OFF(x) (x)
+
+#define FSL_DCFB_MODE_BITER(x) ((x) << 20)
+#define FSL_DCFB_MODE_RASTER_EN BIT(14)
+#define FSL_DCFB_MODE_MODE(x) (x)
+#define FSL_DCFB_MODE_MODE_MASK 0x03
+
+#define FSL_DCFB_BGND_R(x) ((x) << 16)
+#define FSL_DCFB_BGND_G(x) ((x) << 8)
+#define FSL_DCFB_BGND_B(x) (x)
+
+#define FSL_DCFB_FIX_SIZE_Y(x) ((x) << 16)
+#define FSL_DCFB_FIX_SIZE_X(x) (x)
+
+enum fsl_dcfb_fmt {
+ FSL_DCFB_RGB565 = 4,
+ FSL_DCFB_RGB888,
+ FSL_DCFB_ARGB8888,
+};
+
+enum fsl_dcfb_mode {
+ FSL_DCFB_MOD_OFF = 0,
+ FSL_DCFB_MOD_NORMAL,
+ FSL_DCFB_MOD_TEST,
+ FSL_DCFB_MOD_COLORBAR,
+};
+
+struct fsl_dcfb_fb_private {
+ struct fb_info *fsl_dcfb_info;
+ struct device *dev;
+ struct regmap *regmap;
+ struct clk *clk;
+};
+
+struct fsl_dcfb_fb_info {
+ unsigned long pseudo_palette[16];
+ unsigned int count;
+ struct fsl_dcfb_fb_private *parent;
+};
+
+static inline struct fsl_dcfb_fb_private *to_fsl_private(struct fb_info *info)
+{
+ struct fsl_dcfb_fb_info *fsl_info = info->par;
+
+ return (struct fsl_dcfb_fb_private *)fsl_info->parent;
+}
+
+static int fsl_dcfb_get_bpp(unsigned int bits_per_pixel)
+{
+ int bpp;
+
+ switch (bits_per_pixel) {
+ case 16:
+ bpp = FSL_DCFB_RGB565;
+ break;
+ case 24:
+ bpp = FSL_DCFB_RGB888;
+ break;
+ case 32:
+ bpp = FSL_DCFB_ARGB8888;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return bpp;
+}
+
+static int fsl_dcfb_set_panel(struct fb_info *info)
+{
+ struct fb_var_screeninfo *var = &info->var;
+ struct fsl_dcfb_fb_private *dcfb = to_fsl_private(info);
+ int bpp;
+
+ regmap_write(dcfb->regmap, FSL_DCFB_VAR_SIZE,
+ FSL_DCFB_VAR_SIZE_H(var->yres) |
+ FSL_DCFB_VAR_SIZE_W(var->xres));
+ regmap_write(dcfb->regmap, FSL_DCFB_POS,
+ FSL_DCFB_POSY(0) | FSL_DCFB_POSX(0));
+
+ regmap_write(dcfb->regmap, FSL_DCFB_BASE, info->fix.smem_start);
+
+ bpp = fsl_dcfb_get_bpp(var->bits_per_pixel);
+ if (bpp < 0) {
+ dev_err(dcfb->dev, "unsupported color depth: %u\n",
+ var->bits_per_pixel);
+ return bpp;
+ }
+
+ regmap_write(dcfb->regmap, FSL_DCFB_CTRL, FSL_DCFB_CTRL_EN |
+ FSL_DCFB_CTRL_TRANS(0xFF) | FSL_DCFB_CTRL_BPP(bpp));
+ regmap_write(dcfb->regmap, FSL_DCFB_CKMAX, FSL_DCFB_CKMAX_R(0xFF) |
+ FSL_DCFB_CKMAX_G(0xFF) | FSL_DCFB_CKMAX_B(0xFF));
+ regmap_write(dcfb->regmap, FSL_DCFB_CKMIN, FSL_DCFB_CKMIN_R(0) |
+ FSL_DCFB_CKMIN_G(0) | FSL_DCFB_CKMIN_B(0));
+
+ regmap_write(dcfb->regmap, FSL_DCFB_FCOLOR, FSL_DCFB_FCOLOR_OFF(0));
+ regmap_write(dcfb->regmap, FSL_DCFB_BCOLOR, FSL_DCFB_BCOLOR_OFF(0));
+
+ regmap_write(dcfb->regmap, FSL_DCFB_UPDATE, FSL_DCFB_UPDATE_READREG);
+
+ return 0;
+}
+
+static int fsl_dcfb_reset_panel(struct fsl_dcfb_fb_private *dcfb)
+{
+ regmap_write(dcfb->regmap, FSL_DCFB_VAR_SIZE, 0x0);
+ regmap_write(dcfb->regmap, FSL_DCFB_POS, 0x0);
+ regmap_write(dcfb->regmap, FSL_DCFB_BASE, 0x0);
+ regmap_write(dcfb->regmap, FSL_DCFB_CTRL, 0x0);
+ regmap_write(dcfb->regmap, FSL_DCFB_CKMAX, 0x0);
+ regmap_write(dcfb->regmap, FSL_DCFB_CKMIN, 0x0);
+ regmap_write(dcfb->regmap, FSL_DCFB_FCOLOR, 0x0);
+ regmap_write(dcfb->regmap, FSL_DCFB_BCOLOR, 0x0);
+ regmap_write(dcfb->regmap, FSL_DCFB_SKIP, 0x0);
+
+ regmap_write(dcfb->regmap, FSL_DCFB_UPDATE, FSL_DCFB_UPDATE_READREG);
+
+ return 0;
+}
+
+static void fsl_dcfb_modeset(struct fsl_dcfb_fb_private *dcfb,
+ enum fsl_dcfb_mode mode)
+{
+ regmap_update_bits(dcfb->regmap, FSL_DCFB_MODE,
+ FSL_DCFB_MODE_MODE_MASK,
+ FSL_DCFB_MODE_MODE(mode));
+}
+
+static int fsl_dcfb_check_var(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ struct fsl_dcfb_fb_private *dcfb = to_fsl_private(info);
+
+ if (var->xres_virtual < var->xres)
+ var->xres_virtual = var->xres;
+ if (var->yres_virtual < var->yres)
+ var->yres_virtual = var->yres;
+
+ if (var->xoffset + info->var.xres > info->var.xres_virtual)
+ var->xoffset = info->var.xres_virtual - info->var.xres;
+
+ if (var->yoffset + info->var.yres > info->var.yres_virtual)
+ var->yoffset = info->var.yres_virtual - info->var.yres;
+
+ switch (var->bits_per_pixel) {
+ case 16:
+ var->red.length = 5;
+ var->red.offset = 11;
+ var->red.msb_right = 0;
+
+ var->green.length = 6;
+ var->green.offset = 5;
+ var->green.msb_right = 0;
+
+ var->blue.length = 5;
+ var->blue.offset = 0;
+ var->blue.msb_right = 0;
+
+ var->transp.length = 0;
+ var->transp.offset = 0;
+ var->transp.msb_right = 0;
+ break;
+ case 24:
+ var->red.length = 8;
+ var->red.offset = 16;
+ var->red.msb_right = 0;
+
+ var->green.length = 8;
+ var->green.offset = 8;
+ var->green.msb_right = 0;
+
+ var->blue.length = 8;
+ var->blue.offset = 0;
+ var->blue.msb_right = 0;
+
+ var->transp.length = 0;
+ var->transp.offset = 0;
+ var->transp.msb_right = 0;
+ break;
+ case 32:
+ var->red.length = 8;
+ var->red.offset = 16;
+ var->red.msb_right = 0;
+
+ var->green.length = 8;
+ var->green.offset = 8;
+ var->green.msb_right = 0;
+
+ var->blue.length = 8;
+ var->blue.offset = 0;
+ var->blue.msb_right = 0;
+
+ var->transp.length = 8;
+ var->transp.offset = 24;
+ var->transp.msb_right = 0;
+ break;
+ default:
+ dev_err(dcfb->dev, "unsupported color depth: %u\n",
+ var->bits_per_pixel);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int fsl_dcfb_alloc_mem(struct fb_info *info)
+{
+ struct fsl_dcfb_fb_private *dcfb = to_fsl_private(info);
+ u32 smem_len = info->fix.line_length * info->var.yres_virtual;
+
+ info->fix.smem_len = smem_len;
+
+ info->screen_base = dma_alloc_writecombine(info->device,
+ info->fix.smem_len, (dma_addr_t *)&info->fix.smem_start,
+ GFP_KERNEL);
+ if (!info->screen_base) {
+ dev_err(dcfb->dev, "unable to allocate fb memory\n");
+ return -ENOMEM;
+ }
+
+ memset(info->screen_base, 0, info->fix.smem_len);
+
+ return 0;
+}
+
+static void fsl_dcfb_free_mem(struct fb_info *info)
+{
+ if (!info->screen_base)
+ return;
+
+ dma_free_writecombine(info->device, info->fix.smem_len,
+ info->screen_base, info->fix.smem_start);
+
+ info->screen_base = NULL;
+ info->fix.smem_start = 0;
+ info->fix.smem_len = 0;
+}
+
+static int fsl_dcfb_set_par(struct fb_info *info)
+{
+ struct fb_var_screeninfo *var = &info->var;
+ struct fb_fix_screeninfo *fix = &info->fix;
+ struct fsl_dcfb_fb_private *dcfb = to_fsl_private(info);
+ unsigned int div, len;
+
+ fix->type = FB_TYPE_PACKED_PIXELS;
+ fix->accel = FB_ACCEL_NONE;
+ fix->visual = FB_VISUAL_TRUECOLOR;
+ fix->xpanstep = fix->ypanstep = 1;
+
+ fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
+ len = info->var.yres_virtual * info->fix.line_length;
+ if (len != info->fix.smem_len) {
+ if (info->fix.smem_start)
+ fsl_dcfb_free_mem(info);
+
+ if (fsl_dcfb_alloc_mem(info)) {
+ dev_err(dcfb->dev, "unable to allocate FB memory\n");
+ return -ENOMEM;
+ }
+ }
+
+ div = KHZ2PICOS(clk_get_rate(dcfb->clk) / 1000);
+ regmap_write(dcfb->regmap, FSL_DCFB_DIV_RATIO,
+ info->var.pixclock / div);
+
+ regmap_write(dcfb->regmap, FSL_DCFB_FIX_SIZE,
+ FSL_DCFB_FIX_SIZE_Y(var->yres) |
+ FSL_DCFB_FIX_SIZE_X(var->xres / 16));
+
+ regmap_write(dcfb->regmap, FSL_DCFB_HSYN,
+ FSL_DCFB_HSYN_BP(var->left_margin) |
+ FSL_DCFB_HSYN_PW(var->hsync_len) |
+ FSL_DCFB_HSYN_FP(var->right_margin));
+
+ regmap_write(dcfb->regmap, FSL_DCFB_VSYN,
+ FSL_DCFB_VSYN_BP(var->upper_margin) |
+ FSL_DCFB_VSYN_PW(var->vsync_len) |
+ FSL_DCFB_VSYN_FP(var->lower_margin));
+
+ regmap_write(dcfb->regmap, FSL_DCFB_SP,
+ FSL_DCFB_SP_VS | FSL_DCFB_SP_HS);
+
+ regmap_write(dcfb->regmap, FSL_DCFB_BGND, FSL_DCFB_BGND_R(0) |
+ FSL_DCFB_BGND_G(0) | FSL_DCFB_BGND_B(0));
+
+ regmap_write(dcfb->regmap, FSL_DCFB_MODE,
+ FSL_DCFB_MODE_BITER(1) | FSL_DCFB_MODE_RASTER_EN);
+
+ regmap_write(dcfb->regmap, FSL_DCFB_TS, FSL_DCFB_TS_LBV(0x03) |
+ FSL_DCFB_TS_OBH(0x78) | FSL_DCFB_TS_OBL(0x0A));
+
+ regmap_write(dcfb->regmap, FSL_DCFB_UPDATE, FSL_DCFB_UPDATE_READREG);
+
+ fsl_dcfb_modeset(dcfb, FSL_DCFB_MOD_NORMAL);
+ fsl_dcfb_set_panel(info);
+
+ return 0;
+}
+
+#define CNVT_TOHW(val, width) ((((val) << (width)) + 0x7FFF - (val)) >> 16)
+static int fsl_dcfb_setcolreg(unsigned regno, unsigned red, unsigned green,
+ unsigned blue, unsigned transp,
+ struct fb_info *info)
+{
+ int ret = 1;
+
+ /*
+ * If greyscale is true, then we convert the RGB value
+ * to greyscale no matter what visual we are using.
+ */
+ if (info->var.grayscale)
+ red = green = blue = (19595 * red + 38470 * green +
+ 7471 * blue) >> 16;
+
+ switch (info->fix.visual) {
+ case FB_VISUAL_TRUECOLOR:
+ if (regno < 16) {
+ u32 *pal = info->pseudo_palette;
+ u32 value;
+
+ red = CNVT_TOHW(red, info->var.red.length);
+ green = CNVT_TOHW(green, info->var.green.length);
+ blue = CNVT_TOHW(blue, info->var.blue.length);
+ transp = CNVT_TOHW(transp, info->var.transp.length);
+
+ value = (red << info->var.red.offset) |
+ (green << info->var.green.offset) |
+ (blue << info->var.blue.offset) |
+ (transp << info->var.transp.offset);
+
+ pal[regno] = value;
+ ret = 0;
+ }
+ break;
+ case FB_VISUAL_STATIC_PSEUDOCOLOR:
+ case FB_VISUAL_PSEUDOCOLOR:
+ break;
+ }
+
+ return ret;
+}
+#undef CNVT_TOHW
+
+static int fsl_dcfb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ struct fsl_dcfb_fb_private *dcfb = to_fsl_private(info);
+ unsigned long addr;
+ int offset;
+
+ if ((info->var.xoffset == var->xoffset) &&
+ (info->var.yoffset == var->yoffset))
+ return 0;
+
+ if ((var->xoffset + info->var.xres) > info->var.xres_virtual
+ || (var->yoffset + info->var.yres) > info->var.yres_virtual)
+ return -EINVAL;
+
+ info->var.xoffset = var->xoffset;
+ info->var.yoffset = var->yoffset;
+
+ if (var->vmode & FB_VMODE_YWRAP)
+ info->var.vmode |= FB_VMODE_YWRAP;
+ else
+ info->var.vmode &= ~FB_VMODE_YWRAP;
+
+ offset = (info->var.yoffset * info->var.xres_virtual);
+ offset += info->var.xoffset;
+ addr = info->fix.smem_start +
+ (offset * (info->var.bits_per_pixel >> 3));
+
+ regmap_write(dcfb->regmap, FSL_DCFB_BASE, addr);
+ regmap_write(dcfb->regmap, FSL_DCFB_UPDATE, FSL_DCFB_UPDATE_READREG);
+
+ return 0;
+}
+
+static int fsl_dcfb_blank(int blank_mode, struct fb_info *info)
+{
+ struct fsl_dcfb_fb_private *dcfb = to_fsl_private(info);
+
+ switch (blank_mode) {
+ case FB_BLANK_VSYNC_SUSPEND:
+ case FB_BLANK_HSYNC_SUSPEND:
+ case FB_BLANK_NORMAL:
+ fsl_dcfb_reset_panel(dcfb);
+ break;
+ case FB_BLANK_POWERDOWN:
+ fsl_dcfb_modeset(dcfb, FSL_DCFB_MOD_OFF);
+ break;
+ case FB_BLANK_UNBLANK:
+ fsl_dcfb_set_panel(info);
+ break;
+ }
+
+ return 0;
+}
+
+static int fsl_dcfb_open(struct fb_info *info, int user)
+{
+ struct fsl_dcfb_fb_info *fsl_info = info->par;
+ int ret = 0;
+
+ fsl_info->count++;
+ if (fsl_info->count == 1) {
+ fsl_dcfb_check_var(&info->var, info);
+ ret = fsl_dcfb_set_par(info);
+ if (ret < 0)
+ fsl_info->count--;
+ }
+
+ return ret;
+}
+
+static int fsl_dcfb_release(struct fb_info *info, int user)
+{
+ struct fsl_dcfb_fb_info *fsl_info = info->par;
+ struct fsl_dcfb_fb_private *dcfb = to_fsl_private(info);
+ int ret = 0;
+
+ fsl_info->count--;
+ if (fsl_info->count == 0)
+ ret = fsl_dcfb_reset_panel(dcfb);
+
+ return ret;
+}
+
+static struct fb_ops fsl_dcfb_ops = {
+ .owner = THIS_MODULE,
+ .fb_check_var = fsl_dcfb_check_var,
+ .fb_set_par = fsl_dcfb_set_par,
+ .fb_setcolreg = fsl_dcfb_setcolreg,
+ .fb_blank = fsl_dcfb_blank,
+ .fb_pan_display = fsl_dcfb_pan_display,
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = cfb_imageblit,
+ .fb_open = fsl_dcfb_open,
+ .fb_release = fsl_dcfb_release,
+};
+
+static int fsl_dcfb_init_fbinfo(struct fb_info *info)
+{
+ struct fb_var_screeninfo *var = &info->var;
+ struct fsl_dcfb_fb_private *dcfb = to_fsl_private(info);
+ struct device_node *np = dcfb->dev->of_node;
+ struct device_node *dnp, *tnp;
+ struct display_timings *timings;
+ struct fb_videomode fb_vm;
+ int i, ret;
+
+ INIT_LIST_HEAD(&info->modelist);
+
+ dnp = of_parse_phandle(np, "display", 0);
+ if (!dnp) {
+ dev_err(dcfb->dev, "failed to find \"display\" phandle.\n");
+ return -ENODEV;
+ }
+
+ ret = of_property_read_u32(dnp, "bits-per-pixel",
+ &var->bits_per_pixel);
+ if (ret < 0) {
+ dev_err(dcfb->dev, "failed to get \"bits-per-pixel\" property.\n");
+ goto put_dnp;
+ }
+
+ timings = of_get_display_timings(dnp);
+ if (!timings) {
+ dev_err(dcfb->dev, "failed to get display timings\n");
+ return -ENODEV;
+ goto put_dnp;
+ }
+
+ tnp = of_find_node_by_name(dnp, "display-timings");
+ if (!tnp) {
+ dev_err(dcfb->dev, "failed to find \"display-timings\" node\n");
+ return -ENODEV;
+ goto put_dnp;
+ }
+
+ for (i = 0; i < of_get_child_count(tnp); i++) {
+ struct videomode vm;
+
+ ret = videomode_from_timings(timings, &vm, i);
+ if (ret < 0)
+ goto put_tnp;
+
+ ret = fb_videomode_from_videomode(&vm, &fb_vm);
+ if (ret < 0)
+ goto put_tnp;
+
+ fb_add_videomode(&fb_vm, &info->modelist);
+ }
+
+ ret = of_get_fb_videomode(dnp, &fb_vm, OF_USE_NATIVE_MODE);
+ if (ret)
+ goto put_dnp;
+
+ fb_videomode_to_var(&info->var, &fb_vm);
+ ret = fsl_dcfb_check_var(&info->var, info);
+
+put_tnp:
+ of_node_put(tnp);
+put_dnp:
+ of_node_put(dnp);
+
+ return ret;
+}
+
+static const struct regmap_config fsl_scfg_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+
+ .max_register = FSL_SCFG_CTRL,
+};
+
+static int scfg_config(struct fsl_dcfb_fb_private *dcfb, struct device_node *np)
+{
+ struct device_node *snp;
+ struct platform_device *pdev;
+ struct resource *res;
+ void __iomem *base;
+ struct regmap *regmap;
+ int ret = 0;
+
+ snp = of_parse_phandle(np, "scfg-controller", 0);
+ if (!snp)
+ return -ENODEV;
+
+ pdev = of_find_device_by_node(snp);
+ if (!pdev) {
+ ret = -ENODEV;
+ goto put_snp;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ ret = -ENODEV;
+ goto put_snp;
+ }
+
+ base = ioremap(res->start, SZ_4K);
+ if (IS_ERR(base)) {
+ dev_err(&pdev->dev, "could not ioremap scfg resource\n");
+ ret = PTR_ERR(base);
+ goto put_snp;
+ }
+
+ regmap = regmap_init_mmio(&pdev->dev, base,
+ &fsl_scfg_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(&pdev->dev, "regmap init failed\n");
+ ret = PTR_ERR(regmap);
+ goto ioremap;
+ }
+
+ regmap_write(regmap, FSL_SCFG_CTRL, FSL_SCFG_PIXEL_EN);
+
+ regmap_exit(regmap);
+ioremap:
+ iounmap(base);
+put_snp:
+ of_node_put(snp);
+
+ return ret;
+}
+
+static int fsl_dcfb_dev_init(struct device_node *np,
+ struct fsl_dcfb_fb_private *dcfb)
+{
+ int ret;
+
+ ret = scfg_config(dcfb, np);
+ if (ret) {
+ dev_err(dcfb->dev, "could not config scfg\n");
+ return -EINVAL;
+ }
+
+ return fsl_dcfb_reset_panel(dcfb);
+}
+
+static const struct regmap_config fsl_dcfb_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+
+ .max_register = FSL_DCFB_MAX,
+};
+
+static int fsl_dcfb_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct fsl_dcfb_fb_private *dcfb;
+ struct fsl_dcfb_fb_info *fsl_info;
+ struct fb_info *info;
+ struct resource *res;
+ void __iomem *base;
+ int ret = 0;
+
+ dcfb = devm_kzalloc(&pdev->dev,
+ sizeof(struct fsl_dcfb_fb_private), GFP_KERNEL);
+ if (!dcfb)
+ return -ENOMEM;
+
+ dcfb->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "could not get memory IO resource\n");
+ return -ENODEV;
+ }
+
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base)) {
+ dev_err(&pdev->dev, "could not ioremap resource\n");
+ return PTR_ERR(base);
+ }
+
+ dcfb->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
+ NULL, base, &fsl_dcfb_regmap_config);
+ if (IS_ERR(dcfb->regmap)) {
+ dev_err(&pdev->dev, "regmap init failed\n");
+ return PTR_ERR(dcfb->regmap);
+ }
+
+ dcfb->clk = devm_clk_get(&pdev->dev, "dcfb");
+ if (IS_ERR(dcfb->clk)) {
+ ret = PTR_ERR(dcfb->clk);
+ dev_err(&pdev->dev, "could not get clock\n");
+ return -EINVAL;
+ }
+ clk_prepare_enable(dcfb->clk);
+
+ fsl_dcfb_dev_init(np, dcfb);
+
+ dcfb->fsl_dcfb_info =
+ framebuffer_alloc(sizeof(struct fsl_dcfb_fb_info), &pdev->dev);
+ if (!dcfb->fsl_dcfb_info) {
+ ret = -ENOMEM;
+ goto err_clk;
+ }
+
+ dcfb->fsl_dcfb_info->fix.smem_start = 0;
+
+ fsl_info = dcfb->fsl_dcfb_info->par;
+ fsl_info->count = 0,
+ fsl_info->parent = dcfb;
+
+ info = dcfb->fsl_dcfb_info;
+ info->var.activate = FB_ACTIVATE_NOW;
+ info->fbops = &fsl_dcfb_ops;
+ info->flags = FBINFO_FLAG_DEFAULT;
+ info->pseudo_palette = &fsl_info->pseudo_palette;
+
+ ret = fb_alloc_cmap(&info->cmap, 16, 0);
+ if (ret) {
+ ret = -ENOMEM;
+ goto err_mem;
+ }
+
+ ret = fsl_dcfb_init_fbinfo(info);
+ if (ret)
+ goto err_cmap;
+
+ ret = register_framebuffer(info);
+ if (ret < 0) {
+ dev_err(dcfb->dev, "failed to register framebuffer device\n");
+ goto err_cmap;
+ }
+
+ dev_set_drvdata(&pdev->dev, dcfb);
+
+ goto out;
+
+err_cmap:
+ fb_dealloc_cmap(&info->cmap);
+err_mem:
+ framebuffer_release(dcfb->fsl_dcfb_info);
+err_clk:
+ clk_disable_unprepare(dcfb->clk);
+out:
+ return ret;
+}
+
+static int fsl_dcfb_remove(struct platform_device *pdev)
+{
+ struct fsl_dcfb_fb_private *dcfb = dev_get_drvdata(&pdev->dev);
+ struct fb_info *info = dcfb->fsl_dcfb_info;
+
+ fsl_dcfb_modeset(dcfb, FSL_DCFB_MOD_OFF);
+ fsl_dcfb_free_mem(info);
+
+ unregister_framebuffer(info);
+ fb_dealloc_cmap(&info->cmap);
+ framebuffer_release(dcfb->fsl_dcfb_info);
+ clk_disable_unprepare(dcfb->clk);
+
+ return 0;
+}
+
+static struct of_device_id fsl_dcfb_dt_ids[] = {
+ { .compatible = "fsl,ls1021a-dcfb", },
+ {}
+};
+
+static struct platform_driver fsl_dcfb_driver = {
+ .driver = {
+ .name = "fsl-dcfb",
+ .owner = THIS_MODULE,
+ .of_match_table = fsl_dcfb_dt_ids,
+ },
+ .probe = fsl_dcfb_probe,
+ .remove = fsl_dcfb_remove,
+};
+
+module_platform_driver(fsl_dcfb_driver);
+
+MODULE_DESCRIPTION("Freescale Simple Display Controller FB Driver");
+MODULE_ALIAS("platform:fsl-dcfb");
+MODULE_LICENSE("GPL v2");
--
2.1.0.27.g96db324
On Wednesday 03 December 2014 17:15:58 Xiubo Li wrote:
> Framebuffer driver for the Freescale SoC Display Controller.
>
>
> Change in V2:
> - Use the native-mode timing as default.
> - Add to_fsl_private().
<standard reply>
We try to not have any new framebuffer drivers. Please consider making
this a DRM/KMS driver instead.
</standard reply>
Arnd
Hi Arnd,
Thanks for you advice.
Because this is very emergency for customers and have delayed for monthes, and the
DRM/KMS will have a little long time to be supported. So I'd like to add this first
and will add DRM/KMS version later.
Thanks very much,
BRs
Xiubo
> -----Original Message-----
> From: [email protected] [mailto:linux-fbdev-
> [email protected]] On Behalf Of Arnd Bergmann
> Sent: Wednesday, December 03, 2014 5:52 PM
> To: [email protected]
> Cc: Xiubo Li-B47053; [email protected]; [email protected]; linux-
> [email protected]; [email protected]; [email protected];
> [email protected]
> Subject: Re: [PATCHv2 0/4] LS1021A: Add dcfb framebuffer driver support.
>
> On Wednesday 03 December 2014 17:15:58 Xiubo Li wrote:
> > Framebuffer driver for the Freescale SoC Display Controller.
> >
> >
> > Change in V2:
> > - Use the native-mode timing as default.
> > - Add to_fsl_private().
>
> <standard reply>
>
> We try to not have any new framebuffer drivers. Please consider making
> this a DRM/KMS driver instead.
>
> </standard reply>
>
> Arnd
> --
> To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Xiubo,
On 04/12/14 03:56, [email protected] wrote:
> Hi Arnd,
>
> Thanks for you advice.
>
> Because this is very emergency for customers and have delayed for monthes, and the
> DRM/KMS will have a little long time to be supported. So I'd like to add this first
> and will add DRM/KMS version later.
I would also suggest to just write a drm driver for this. I don't see
anything special in this driver that would be better supported via
fbdev. With drm you'll get a more modern framework, and you will still
have the same /dev/fbX device to use for legacy userspace software.
What do you mean with "delayed for months"? The first version of this
series (that I can find) was posted less than two weeks ago.
Tomi
Hi Tomi,
> -----Original Message-----
> From: Tomi Valkeinen [mailto:[email protected]]
> Sent: Thursday, December 04, 2014 4:10 PM
> To: Xiubo Li-B47053; Arnd Bergmann
> Cc: [email protected]; [email protected]; linux-
> [email protected]; [email protected]; alexander.stein@systec-
> electronic.com
> Subject: Re: [PATCHv2 0/4] LS1021A: Add dcfb framebuffer driver support.
>
> Hi Xiubo,
>
> On 04/12/14 03:56, [email protected] wrote:
> > Hi Arnd,
> >
> > Thanks for you advice.
> >
> > Because this is very emergency for customers and have delayed for monthes,
> and the
> > DRM/KMS will have a little long time to be supported. So I'd like to add
> this first
> > and will add DRM/KMS version later.
>
> I would also suggest to just write a drm driver for this. I don't see
> anything special in this driver that would be better supported via
> fbdev. With drm you'll get a more modern framework, and you will still
> have the same /dev/fbX device to use for legacy userspace software.
>
> What do you mean with "delayed for months"? The first version of this
> series (that I can find) was posted less than two weeks ago.
>
Sorry for confusing, it was delayed for other reasons internal.
I am not familiar about the DRM, and I'd like to know if the DRM driver will be
support, should I also develop the libdrm too ? Or just coding in kernel level ?
Is there any Document about how to have /dev/fbX device to use ?
If possible, I'd like this could be accept for this time. And I will add the DRM
Version later(for developing and testing will take a long time).
Thanks very much,
BRs
Xiubo
> Tomi
>
On 04/12/14 10:30, [email protected] wrote:
> Sorry for confusing, it was delayed for other reasons internal.
>
> I am not familiar about the DRM, and I'd like to know if the DRM driver will be
> support, should I also develop the libdrm too ? Or just coding in kernel level ?
For simple drm drivers (this looks like it would be a simple one), I
don't think there's any need for libdrm support. The generic DRM
interfaces should be enough, so just kernel level coding needed.
> Is there any Document about how to have /dev/fbX device to use ?
There's DRM documentation here:
https://www.kernel.org/doc/htmldocs/drm/index.html
And many existing drivers to use as examples. The dri-devel list
(http://lists.freedesktop.org/mailman/listinfo/dri-devel), which is the
mailing list used for DRM development, is active and you probably can
get more support from there than from the fbdev list.
It should not be a huge effort to write a drm driver for a simple LCD
controller like this. I would bet that you can write a working driver in
a week.
> If possible, I'd like this could be accept for this time. And I will add the DRM
> Version later(for developing and testing will take a long time).
I'm sorry but "it was delayed for internal reasons" and "our customer
needs this driver" are not very good reasons for getting a driver merged
to mainline Linux.
You can provide your driver to your customer as a separate patch series
which they can apply. There should be no conflicts or other issues
there, so it should be simple.
Tomi
On Wednesday 03 December 2014 17:15:59, Xiubo Li wrote:
> + tnp = of_find_node_by_name(dnp, "display-timings");
> + if (!tnp) {
> + dev_err(dcfb->dev, "failed to find \"display-timings\" node\n");
> + return -ENODEV;
> + goto put_dnp;
> + }
> +
> + for (i = 0; i < of_get_child_count(tnp); i++) {
> + struct videomode vm;
> +
> + ret = videomode_from_timings(timings, &vm, i);
> + if (ret < 0)
> + goto put_tnp;
> +
> + ret = fb_videomode_from_videomode(&vm, &fb_vm);
> + if (ret < 0)
> + goto put_tnp;
> +
> + fb_add_videomode(&fb_vm, &info->modelist);
> + }
> +
> + ret = of_get_fb_videomode(dnp, &fb_vm, OF_USE_NATIVE_MODE);
> + if (ret)
> + goto put_dnp;
Souldn't this be put_tnp like in the loop above?
> + fb_videomode_to_var(&info->var, &fb_vm);
> + ret = fsl_dcfb_check_var(&info->var, info);
But picking the native mode per default looks nice to be! :)
Best regards,
Alexander
--
Dipl.-Inf. Alexander Stein
SYS TEC electronic GmbH
Am Windrad 2
08468 Heinsdorfergrund
Tel.: 03765 38600-1156
Fax: 03765 38600-4100
Email: [email protected]
Website: http://www.systec-electronic.com
Managing Director: Dipl.-Phys. Siegmar Schmidt
Commercial registry: Amtsgericht Chemnitz, HRB 28082
Hi Tomi,
Thanks for your information very much.
> > Sorry for confusing, it was delayed for other reasons internal.
> >
> > I am not familiar about the DRM, and I'd like to know if the DRM driver will
> be
> > support, should I also develop the libdrm too ? Or just coding in kernel
> level ?
>
> For simple drm drivers (this looks like it would be a simple one), I
> don't think there's any need for libdrm support. The generic DRM
> interfaces should be enough, so just kernel level coding needed.
>
That's to say, if I am using the X11 server without any code in usrspace,
If the DRM driver will support /dev/fbX, it could work correctly ?
Thanks,
BRs
Xiubo
On 04/12/14 11:54, [email protected] wrote:
> Hi Tomi,
>
> Thanks for your information very much.
>
>>> Sorry for confusing, it was delayed for other reasons internal.
>>>
>>> I am not familiar about the DRM, and I'd like to know if the DRM driver will
>> be
>>> support, should I also develop the libdrm too ? Or just coding in kernel
>> level ?
>>
>> For simple drm drivers (this looks like it would be a simple one), I
>> don't think there's any need for libdrm support. The generic DRM
>> interfaces should be enough, so just kernel level coding needed.
>>
>
> That's to say, if I am using the X11 server without any code in usrspace,
> If the DRM driver will support /dev/fbX, it could work correctly ?
Yes. DRM offers helper code to add /dev/fbX with not too many lines. You
can look at the docs and drm_fb_helper.c.
And X11 should work fine on top of that, using the X11 fbdev support.
Tomi
Hi Tomi,
Thanks very much for your help.
I will have a try these days.
BRs
Xiubo
> -----Original Message-----
> From: Tomi Valkeinen [mailto:[email protected]]
> Sent: Thursday, December 04, 2014 6:00 PM
> To: Xiubo Li-B47053
> Cc: Arnd Bergmann; [email protected]; [email protected]; linux-
> [email protected]; [email protected]; alexander.stein@systec-
> electronic.com
> Subject: Re: [PATCHv2 0/4] LS1021A: Add dcfb framebuffer driver support.
>
> On 04/12/14 11:54, [email protected] wrote:
> > Hi Tomi,
> >
> > Thanks for your information very much.
> >
> >>> Sorry for confusing, it was delayed for other reasons internal.
> >>>
> >>> I am not familiar about the DRM, and I'd like to know if the DRM driver
> will
> >> be
> >>> support, should I also develop the libdrm too ? Or just coding in kernel
> >> level ?
> >>
> >> For simple drm drivers (this looks like it would be a simple one), I
> >> don't think there's any need for libdrm support. The generic DRM
> >> interfaces should be enough, so just kernel level coding needed.
> >>
> >
> > That's to say, if I am using the X11 server without any code in usrspace,
> > If the DRM driver will support /dev/fbX, it could work correctly ?
>
> Yes. DRM offers helper code to add /dev/fbX with not too many lines. You
> can look at the docs and drm_fb_helper.c.
>
> And X11 should work fine on top of that, using the X11 fbdev support.
>
> Tomi
>