<div dir="ltr"><div dir="ltr"> </div> <div class="gmail_quote"><div dir="ltr" class="gmail_attr">Daniel Vetter <<a href="mailto:daniel@ffwll.ch" target="_blank">daniel@ffwll.ch</a>> 于2021年2月3日周三下午10:15写道： </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Tue, Jan 05, 2021 at 09:46:05PM +0800, Kevin Tang wrote: > Adds DPU(Display Processor Unit) support for the Unisoc's display subsystem. > It's support multi planes, scaler, rotation, PQ(Picture Quality) and more. > > Cc: Orson Zhai <<a href="mailto:orsonzhai@gmail.com" target="_blank">orsonzhai@gmail.com</a>> > Cc: Chunyan Zhang <<a href="mailto:zhang.lyra@gmail.com" target="_blank">zhang.lyra@gmail.com</a>> > Signed-off-by: Kevin Tang <<a href="mailto:kevin.tang@unisoc.com" target="_blank">kevin.tang@unisoc.com</a>> > > v2: > - Use drm_xxx to replace all DRM_XXX. > - Use kzalloc to replace devm_kzalloc for sprd_dpu structure init. > > v3: > - Remove dpu_layer stuff layer and commit layers by aotmic_update Scrolling through the code looks very tidy&neat, only thing I spotted is that you could use the new drmm_ infrastructure we just landed. See comments below, with that addressed: </blockquote><div>Hi Daniel,</div><div>Thank you for taking the time to review, i will update my patch on the drm-misc-next and replace drm_helpers with drmm_helpers. </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> Acked-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch" target="_blank">daniel.vetter@ffwll.ch</a>> > --- > drivers/gpu/drm/sprd/Kconfig | 1 + > drivers/gpu/drm/sprd/Makefile | 4 +- > drivers/gpu/drm/sprd/sprd_dpu.c | 985 ++++++++++++++++++++++++++++++++++++++++ > drivers/gpu/drm/sprd/sprd_dpu.h | 120 +++++ > drivers/gpu/drm/sprd/sprd_drm.c | 1 + > drivers/gpu/drm/sprd/sprd_drm.h | 2 + > 6 files changed, 1111 insertions(+), 2 deletions(-) > create mode 100644 drivers/gpu/drm/sprd/sprd_dpu.c > create mode 100644 drivers/gpu/drm/sprd/sprd_dpu.h > > diff --git a/drivers/gpu/drm/sprd/Kconfig b/drivers/gpu/drm/sprd/Kconfig > index 6e80cc9..9b4ef9a 100644 > --- a/drivers/gpu/drm/sprd/Kconfig > +++ b/drivers/gpu/drm/sprd/Kconfig > @@ -3,6 +3,7 @@ config DRM_SPRD > depends on ARCH_SPRD || COMPILE_TEST > depends on DRM && OF > select DRM_KMS_HELPER > + select VIDEOMODE_HELPERS > select DRM_GEM_CMA_HELPER > select DRM_KMS_CMA_HELPER > select DRM_MIPI_DSI > diff --git a/drivers/gpu/drm/sprd/Makefile b/drivers/gpu/drm/sprd/Makefile > index 86d95d9..6c25bfa 100644 > --- a/drivers/gpu/drm/sprd/Makefile > +++ b/drivers/gpu/drm/sprd/Makefile > @@ -1,5 +1,5 @@ > # SPDX-License-Identifier: GPL-2.0 > > -subdir-ccflags-y += -I$(srctree)/$(src) > +obj-y := sprd_drm.o \ > + sprd_dpu.o > > -obj-y := sprd_drm.o > diff --git a/drivers/gpu/drm/sprd/sprd_dpu.c b/drivers/gpu/drm/sprd/sprd_dpu.c > new file mode 100644 > index 0000000..d562d44 > --- /dev/null > +++ b/drivers/gpu/drm/sprd/sprd_dpu.c > @@ -0,0 +1,985 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2020 Unisoc Inc. > + */ > + > +#include <linux/component.h> > +#include <linux/delay.h> > +#include <linux/dma-buf.h> > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_address.h> > +#include <linux/of_device.h> > +#include <linux/of_irq.h> > +#include <linux/wait.h> > +#include <linux/workqueue.h> > + > +#include <drm/drm_atomic_helper.h> > +#include <drm/drm_crtc_helper.h> > +#include <drm/drm_fb_cma_helper.h> > +#include <drm/drm_gem_cma_helper.h> > +#include <drm/drm_gem_framebuffer_helper.h> > +#include <drm/drm_plane_helper.h> > + > +#include "sprd_drm.h" > +#include "sprd_dpu.h" > + > +/* Global control registers */ > +#define REG_DPU_CTRL 0x04 > +#define REG_DPU_CFG0 0x08 > +#define REG_PANEL_SIZE 0x20 > +#define REG_BLEND_SIZE 0x24 > +#define REG_BG_COLOR 0x2C > + > +/* Layer0 control registers */ > +#define REG_LAY_BASE_ADDR0 0x30 > +#define REG_LAY_BASE_ADDR1 0x34 > +#define REG_LAY_BASE_ADDR2 0x38 > +#define REG_LAY_CTRL 0x40 > +#define REG_LAY_SIZE 0x44 > +#define REG_LAY_PITCH 0x48 > +#define REG_LAY_POS 0x4C > +#define REG_LAY_ALPHA 0x50 > +#define REG_LAY_CROP_START 0x5C > + > +/* Interrupt control registers */ > +#define REG_DPU_INT_EN 0x1E0 > +#define REG_DPU_INT_CLR 0x1E4 > +#define REG_DPU_INT_STS 0x1E8 > + > +/* DPI control registers */ > +#define REG_DPI_CTRL 0x1F0 > +#define REG_DPI_H_TIMING 0x1F4 > +#define REG_DPI_V_TIMING 0x1F8 > + > +/* MMU control registers */ > +#define REG_MMU_EN 0x800 > +#define REG_MMU_VPN_RANGE 0x80C > +#define REG_MMU_VAOR_ADDR_RD 0x818 > +#define REG_MMU_VAOR_ADDR_WR 0x81C > +#define REG_MMU_INV_ADDR_RD 0x820 > +#define REG_MMU_INV_ADDR_WR 0x824 > +#define REG_MMU_PPN1 0x83C > +#define REG_MMU_RANGE1 0x840 > +#define REG_MMU_PPN2 0x844 > +#define REG_MMU_RANGE2 0x848 > + > +/* Global control bits */ > +#define BIT_DPU_RUN BIT(0) > +#define BIT_DPU_STOP BIT(1) > +#define BIT_DPU_REG_UPDATE BIT(2) > +#define BIT_DPU_IF_EDPI BIT(0) > + > +/* Layer control bits */ > +#define BIT_DPU_LAY_EN BIT(0) > +#define BIT_DPU_LAY_LAYER_ALPHA (0x01 << 2) > +#define BIT_DPU_LAY_COMBO_ALPHA (0x02 << 2) > +#define BIT_DPU_LAY_FORMAT_YUV422_2PLANE (0x00 << 4) > +#define BIT_DPU_LAY_FORMAT_YUV420_2PLANE (0x01 << 4) > +#define BIT_DPU_LAY_FORMAT_YUV420_3PLANE (0x02 << 4) > +#define BIT_DPU_LAY_FORMAT_ARGB8888 (0x03 << 4) > +#define BIT_DPU_LAY_FORMAT_RGB565 (0x04 << 4) > +#define BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3 (0x00 << 8) > +#define BIT_DPU_LAY_DATA_ENDIAN_B3B2B1B0 (0x01 << 8) > +#define BIT_DPU_LAY_NO_SWITCH (0x00 << 10) > +#define BIT_DPU_LAY_RB_OR_UV_SWITCH (0x01 << 10) > +#define BIT_DPU_LAY_MODE_BLEND_NORMAL (0x00 << 16) > +#define BIT_DPU_LAY_MODE_BLEND_PREMULT (0x01 << 16) > + > +/* Interrupt control & status bits */ > +#define BIT_DPU_INT_DONE BIT(0) > +#define BIT_DPU_INT_TE BIT(1) > +#define BIT_DPU_INT_ERR BIT(2) > +#define BIT_DPU_INT_UPDATE_DONE BIT(4) > +#define BIT_DPU_INT_VSYNC BIT(5) > +#define BIT_DPU_INT_MMU_VAOR_RD BIT(16) > +#define BIT_DPU_INT_MMU_VAOR_WR BIT(17) > +#define BIT_DPU_INT_MMU_INV_RD BIT(18) > +#define BIT_DPU_INT_MMU_INV_WR BIT(19) > + > +/* DPI control bits */ > +#define BIT_DPU_EDPI_TE_EN BIT(8) > +#define BIT_DPU_EDPI_FROM_EXTERNAL_PAD BIT(10) > +#define BIT_DPU_DPI_HALT_EN BIT(16) > + > +static const u32 primary_fmts[] = { > + DRM_FORMAT_XRGB8888, > + DRM_FORMAT_XBGR8888, > + DRM_FORMAT_ARGB8888, > + DRM_FORMAT_ABGR8888, > + DRM_FORMAT_RGBA8888, > + DRM_FORMAT_BGRA8888, > + DRM_FORMAT_RGBX8888, > + DRM_FORMAT_RGB565, > + DRM_FORMAT_BGR565, > + DRM_FORMAT_NV12, > + DRM_FORMAT_NV21, > + DRM_FORMAT_NV16, > + DRM_FORMAT_NV61, > + DRM_FORMAT_YUV420, > + DRM_FORMAT_YVU420, > +}; > + > +struct sprd_plane { > + struct drm_plane plane; > + u32 index; > +}; > + > +static inline struct sprd_plane *to_sprd_plane(struct drm_plane *plane) > +{ > + return container_of(plane, struct sprd_plane, plane); > +} > + > +static u32 check_mmu_isr(struct sprd_dpu *dpu, u32 reg_val) > +{ > + struct dpu_context *ctx = &dpu->ctx; > + u32 mmu_mask = BIT_DPU_INT_MMU_VAOR_RD | > + BIT_DPU_INT_MMU_VAOR_WR | > + BIT_DPU_INT_MMU_INV_RD | > + BIT_DPU_INT_MMU_INV_WR; > + u32 val = reg_val & mmu_mask; > + int i; > + > + if (val) { > + drm_err(dpu->drm, "--- iommu interrupt err: 0x%04x ---\n", val); > + > + if (val & BIT_DPU_INT_MMU_INV_RD) > + drm_err(dpu->drm, "iommu invalid read error, addr: 0x%08x\n", > + readl(ctx->base + REG_MMU_INV_ADDR_RD)); > + if (val & BIT_DPU_INT_MMU_INV_WR) > + drm_err(dpu->drm, "iommu invalid write error, addr: 0x%08x\n", > + readl(ctx->base + REG_MMU_INV_ADDR_WR)); > + if (val & BIT_DPU_INT_MMU_VAOR_RD) > + drm_err(dpu->drm, "iommu va out of range read error, addr: 0x%08x\n", > + readl(ctx->base + REG_MMU_VAOR_ADDR_RD)); > + if (val & BIT_DPU_INT_MMU_VAOR_WR) > + drm_err(dpu->drm, "iommu va out of range write error, addr: 0x%08x\n", > + readl(ctx->base + REG_MMU_VAOR_ADDR_WR)); > + > + for (i = 0; i < 8; i++) { > + reg_val = layer_reg_rd(ctx, REG_LAY_CTRL, i); > + if (reg_val & 0x1) > + drm_info(dpu->drm, "layer%d: 0x%08x 0x%08x 0x%08x ctrl: 0x%08x\n", i, > + layer_reg_rd(ctx, REG_LAY_BASE_ADDR0, i), > + layer_reg_rd(ctx, REG_LAY_BASE_ADDR1, i), > + layer_reg_rd(ctx, REG_LAY_BASE_ADDR2, i), > + layer_reg_rd(ctx, REG_LAY_CTRL, i)); > + } > + } > + > + return val; > +} > + > +static int dpu_wait_stop_done(struct sprd_dpu *dpu) > +{ > + struct dpu_context *ctx = &dpu->ctx; > + int rc; > + > + if (ctx->stopped) > + return 0; > + > + rc = wait_event_interruptible_timeout(ctx->wait_queue, ctx->evt_stop, > + msecs_to_jiffies(500)); > + ctx->evt_stop = false; > + > + ctx->stopped = true; > + > + if (!rc) { > + drm_err(dpu->drm, "dpu wait for stop done time out!\n"); > + return -ETIMEDOUT; > + } > + > + return 0; > +} > + > +static int dpu_wait_update_done(struct sprd_dpu *dpu) > +{ > + struct dpu_context *ctx = &dpu->ctx; > + int rc; > + > + ctx->evt_update = false; > + > + rc = wait_event_interruptible_timeout(ctx->wait_queue, ctx->evt_update, > + msecs_to_jiffies(500)); > + > + if (!rc) { > + drm_err(dpu->drm, "dpu wait for reg update done time out!\n"); > + return -ETIMEDOUT; > + } > + > + return 0; > +} > + > +static u32 drm_format_to_dpu(struct drm_framebuffer *fb) > +{ > + u32 format = 0; > + > + switch (fb->format->format) { > + case DRM_FORMAT_BGRA8888: > + /* BGRA8888 -> ARGB8888 */ > + format |= BIT_DPU_LAY_DATA_ENDIAN_B3B2B1B0; > + format |= BIT_DPU_LAY_FORMAT_ARGB8888; > + break; > + case DRM_FORMAT_RGBX8888: > + case DRM_FORMAT_RGBA8888: > + /* RGBA8888 -> ABGR8888 */ > + format |= BIT_DPU_LAY_DATA_ENDIAN_B3B2B1B0; > + /* fallthrough */ > + case DRM_FORMAT_ABGR8888: > + /* RB switch */ > + format |= BIT_DPU_LAY_RB_OR_UV_SWITCH; > + /* fallthrough */ > + case DRM_FORMAT_ARGB8888: > + format |= BIT_DPU_LAY_FORMAT_ARGB8888; > + break; > + case DRM_FORMAT_XBGR8888: > + /* RB switch */ > + format |= BIT_DPU_LAY_RB_OR_UV_SWITCH; > + /* fallthrough */ > + case DRM_FORMAT_XRGB8888: > + format |= BIT_DPU_LAY_FORMAT_ARGB8888; > + break; > + case DRM_FORMAT_BGR565: > + /* RB switch */ > + format |= BIT_DPU_LAY_RB_OR_UV_SWITCH; > + /* fallthrough */ > + case DRM_FORMAT_RGB565: > + format |= BIT_DPU_LAY_FORMAT_RGB565; > + break; > + case DRM_FORMAT_NV12: > + /* 2-Lane: Yuv420 */ > + format |= BIT_DPU_LAY_FORMAT_YUV420_2PLANE; > + /* Y endian */ > + format |= BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3; > + /* UV endian */ > + format |= BIT_DPU_LAY_NO_SWITCH; > + break; > + case DRM_FORMAT_NV21: > + /* 2-Lane: Yuv420 */ > + format |= BIT_DPU_LAY_FORMAT_YUV420_2PLANE; > + /* Y endian */ > + format |= BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3; > + /* UV endian */ > + format |= BIT_DPU_LAY_RB_OR_UV_SWITCH; > + break; > + case DRM_FORMAT_NV16: > + /* 2-Lane: Yuv422 */ > + format |= BIT_DPU_LAY_FORMAT_YUV422_2PLANE; > + /* Y endian */ > + format |= BIT_DPU_LAY_DATA_ENDIAN_B3B2B1B0; > + /* UV endian */ > + format |= BIT_DPU_LAY_RB_OR_UV_SWITCH; > + break; > + case DRM_FORMAT_NV61: > + /* 2-Lane: Yuv422 */ > + format |= BIT_DPU_LAY_FORMAT_YUV422_2PLANE; > + /* Y endian */ > + format |= BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3; > + /* UV endian */ > + format |= BIT_DPU_LAY_NO_SWITCH; > + break; > + case DRM_FORMAT_YUV420: > + format |= BIT_DPU_LAY_FORMAT_YUV420_3PLANE; > + /* Y endian */ > + format |= BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3; > + /* UV endian */ > + format |= BIT_DPU_LAY_NO_SWITCH; > + break; > + case DRM_FORMAT_YVU420: > + format |= BIT_DPU_LAY_FORMAT_YUV420_3PLANE; > + /* Y endian */ > + format |= BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3; > + /* UV endian */ > + format |= BIT_DPU_LAY_RB_OR_UV_SWITCH; > + break; > + default: > + break; > + } > + > + return format; > +} > + > +static u32 drm_rotation_to_dpu(struct drm_plane_state *state) > +{ > + u32 rotation; > + > + switch (state->rotation) { > + default: > + case DRM_MODE_ROTATE_0: > + rotation = DPU_LAYER_ROTATION_0; > + break; > + case DRM_MODE_ROTATE_90: > + rotation = DPU_LAYER_ROTATION_90; > + break; > + case DRM_MODE_ROTATE_180: > + rotation = DPU_LAYER_ROTATION_180; > + break; > + case DRM_MODE_ROTATE_270: > + rotation = DPU_LAYER_ROTATION_270; > + break; > + case DRM_MODE_REFLECT_Y: > + rotation = DPU_LAYER_ROTATION_180_M; > + break; > + case (DRM_MODE_REFLECT_Y | DRM_MODE_ROTATE_90): > + rotation = DPU_LAYER_ROTATION_90_M; > + break; > + case DRM_MODE_REFLECT_X: > + rotation = DPU_LAYER_ROTATION_0_M; > + break; > + case (DRM_MODE_REFLECT_X | DRM_MODE_ROTATE_90): > + rotation = DPU_LAYER_ROTATION_270_M; > + break; > + } > + > + return rotation; > +} > + > +static u32 drm_blend_to_dpu(struct drm_plane_state *state) > +{ > + u32 blend = 0; > + > + switch (state->pixel_blend_mode) { > + case DRM_MODE_BLEND_COVERAGE: > + /* alpha mode select - combo alpha */ > + blend |= BIT_DPU_LAY_COMBO_ALPHA; > + /* Normal mode */ > + blend |= BIT_DPU_LAY_MODE_BLEND_NORMAL; > + break; > + case DRM_MODE_BLEND_PREMULTI: > + /* alpha mode select - combo alpha */ > + blend |= BIT_DPU_LAY_COMBO_ALPHA; > + /* Pre-mult mode */ > + blend |= BIT_DPU_LAY_MODE_BLEND_PREMULT; > + break; > + case DRM_MODE_BLEND_PIXEL_NONE: > + default: > + /* don't do blending, maybe RGBX */ > + /* alpha mode select - layer alpha */ > + blend |= BIT_DPU_LAY_LAYER_ALPHA; > + break; > + } > + > + return blend; > +} > + > +static void sprd_dpu_layer(struct sprd_dpu *dpu, struct sprd_plane *plane, > + struct drm_plane_state *state) > +{ > + struct dpu_context *ctx = &dpu->ctx; > + struct drm_gem_cma_object *cma_obj; > + const struct drm_format_info *info; > + struct drm_framebuffer *fb = state->fb; > + u32 addr, size, offset, pitch, blend, format, rotation; > + u32 src_x = state->src_x >> 16; > + u32 src_y = state->src_y >> 16; > + u32 src_w = state->src_w >> 16; > + u32 src_h = state->src_h >> 16; > + u32 dst_x = state->crtc_x; > + u32 dst_y = state->crtc_y; > + u32 alpha = state->alpha; > + int i; > + > + offset = (dst_x & 0xffff) | (dst_y << 16); > + size = (src_w & 0xffff) | (src_h << 16); > + > + for (i = 0; i < fb->format->num_planes; i++) { > + cma_obj = drm_fb_cma_get_gem_obj(fb, i); > + addr = cma_obj->paddr + fb->offsets[i]; > + > + if (i == 0) > + layer_reg_wr(ctx, REG_LAY_BASE_ADDR0, addr, plane->index); > + else if (i == 1) > + layer_reg_wr(ctx, REG_LAY_BASE_ADDR1, addr, plane->index); > + else > + layer_reg_wr(ctx, REG_LAY_BASE_ADDR2, addr, plane->index); > + } > + > + info = drm_format_info(fb->format->format); > + if (fb->format->num_planes == 3) { > + /* UV pitch is 1/2 of Y pitch */ > + pitch = (fb->pitches[0] / info->cpp[0]) | > + (fb->pitches[0] / info->cpp[0] << 15); > + } else { > + pitch = fb->pitches[0] / info->cpp[0]; > + } > + > + layer_reg_wr(ctx, REG_LAY_POS, offset, plane->index); > + layer_reg_wr(ctx, REG_LAY_SIZE, size, plane->index); > + layer_reg_wr(ctx, REG_LAY_CROP_START, > + src_y << 16 | src_x, plane->index); > + layer_reg_wr(ctx, REG_LAY_ALPHA, alpha, plane->index); > + layer_reg_wr(ctx, REG_LAY_PITCH, pitch, plane->index); > + > + format = drm_format_to_dpu(fb); > + blend = drm_blend_to_dpu(state); > + rotation = drm_rotation_to_dpu(state); > + > + layer_reg_wr(ctx, REG_LAY_CTRL, BIT_DPU_LAY_EN | > + format | > + blend | > + rotation << 20, > + plane->index); > +} > + > +static void sprd_dpu_flip(struct sprd_dpu *dpu) > +{ > + struct dpu_context *ctx = &dpu->ctx; > + u32 reg_val; > + > + /* > + * Make sure the dpu is in stop status. DPU has no shadow > + * registers in EDPI mode. So the config registers can only be > + * updated in the rising edge of DPU_RUN bit. > + */ > + if (ctx->if_type == SPRD_DPU_IF_EDPI) > + dpu_wait_stop_done(dpu); > + > + /* update trigger and wait */ > + if (ctx->if_type == SPRD_DPU_IF_DPI) { > + if (!ctx->stopped) { > + dpu_reg_set(ctx, REG_DPU_CTRL, BIT_DPU_REG_UPDATE); > + dpu_wait_update_done(dpu); > + } > + > + dpu_reg_set(ctx, REG_DPU_INT_EN, BIT_DPU_INT_ERR); > + } else if (ctx->if_type == SPRD_DPU_IF_EDPI) { > + dpu_reg_set(ctx, REG_DPU_CTRL, BIT_DPU_RUN); > + > + ctx->stopped = false; > + } > + > + /* > + * If the following interrupt was disabled in isr, > + * re-enable it. > + */ > + reg_val = BIT_DPU_INT_MMU_VAOR_RD | > + BIT_DPU_INT_MMU_VAOR_WR | > + BIT_DPU_INT_MMU_INV_RD | > + BIT_DPU_INT_MMU_INV_WR; > + dpu_reg_set(ctx, REG_DPU_INT_EN, reg_val); > +} > + > +static void sprd_dpu_init(struct sprd_dpu *dpu) > +{ > + struct dpu_context *ctx = &dpu->ctx; > + u32 reg_val, size; > + > + writel(0x00, ctx->base + REG_BG_COLOR); > + > + size = (ctx->vm.vactive << 16) | ctx->vm.hactive; > + writel(size, ctx->base + REG_PANEL_SIZE); > + writel(size, ctx->base + REG_BLEND_SIZE); > + > + writel(0x00, ctx->base + REG_MMU_EN); > + writel(0x00, ctx->base + REG_MMU_PPN1); > + writel(0xffff, ctx->base + REG_MMU_RANGE1); > + writel(0x00, ctx->base + REG_MMU_PPN2); > + writel(0xffff, ctx->base + REG_MMU_RANGE2); > + writel(0x1ffff, ctx->base + REG_MMU_VPN_RANGE); > +} > + > +static void sprd_dpu_fini(struct sprd_dpu *dpu) > +{ > + struct dpu_context *ctx = &dpu->ctx; > + > + writel(0x00, ctx->base + REG_DPU_INT_EN); > + writel(0xff, ctx->base + REG_DPU_INT_CLR); > +} > + > +static void sprd_dpi_init(struct sprd_dpu *dpu) > +{ > + struct dpu_context *ctx = &dpu->ctx; > + u32 int_mask = 0; > + u32 reg_val; > + > + if (ctx->if_type == SPRD_DPU_IF_DPI) { > + /* use dpi as interface */ > + dpu_reg_clr(ctx, REG_DPU_CFG0, BIT_DPU_IF_EDPI); > + /* disable Halt function for SPRD DSI */ > + dpu_reg_clr(ctx, REG_DPI_CTRL, BIT_DPU_DPI_HALT_EN); > + /* select te from external pad */ > + dpu_reg_set(ctx, REG_DPI_CTRL, BIT_DPU_EDPI_FROM_EXTERNAL_PAD); > + > + /* set dpi timing */ > + reg_val = ctx->vm.hsync_len << 0 | > + ctx->vm.hback_porch << 8 | > + ctx->vm.hfront_porch << 20; > + writel(reg_val, ctx->base + REG_DPI_H_TIMING); > + > + reg_val = ctx->vm.vsync_len << 0 | > + ctx->vm.vback_porch << 8 | > + ctx->vm.vfront_porch << 20; > + writel(reg_val, ctx->base + REG_DPI_V_TIMING); > + > + if (ctx->vm.vsync_len + ctx->vm.vback_porch < 32) > + drm_warn(dpu->drm, "Warning: (vsync + vbp) < 32, " > + "underflow risk!\n"); > + > + /* enable dpu update done INT */ > + int_mask |= BIT_DPU_INT_UPDATE_DONE; > + /* enable dpu done INT */ > + int_mask |= BIT_DPU_INT_DONE; > + /* enable dpu dpi vsync */ > + int_mask |= BIT_DPU_INT_VSYNC; > + /* enable dpu TE INT */ > + int_mask |= BIT_DPU_INT_TE; > + /* enable underflow err INT */ > + int_mask |= BIT_DPU_INT_ERR; > + } else if (ctx->if_type == SPRD_DPU_IF_EDPI) { > + /* use edpi as interface */ > + dpu_reg_set(ctx, REG_DPU_CFG0, BIT_DPU_IF_EDPI); > + /* use external te */ > + dpu_reg_set(ctx, REG_DPI_CTRL, BIT_DPU_EDPI_FROM_EXTERNAL_PAD); > + /* enable te */ > + dpu_reg_set(ctx, REG_DPI_CTRL, BIT_DPU_EDPI_TE_EN); > + > + /* enable stop done INT */ > + int_mask |= BIT_DPU_INT_DONE; > + /* enable TE INT */ > + int_mask |= BIT_DPU_INT_TE; > + } > + > + /* enable iommu va out of range read error INT */ > + int_mask |= BIT_DPU_INT_MMU_VAOR_RD; > + /* enable iommu va out of range write error INT */ > + int_mask |= BIT_DPU_INT_MMU_VAOR_WR; > + /* enable iommu invalid read error INT */ > + int_mask |= BIT_DPU_INT_MMU_INV_RD; > + /* enable iommu invalid write error INT */ > + int_mask |= BIT_DPU_INT_MMU_INV_WR; > + > + writel(int_mask, ctx->base + REG_DPU_INT_EN); > +} > + > +void sprd_dpu_run(struct sprd_dpu *dpu) > +{ > + struct dpu_context *ctx = &dpu->ctx; > + > + dpu_reg_set(ctx, REG_DPU_CTRL, BIT_DPU_RUN); > + > + ctx->stopped = false; > +} > + > +void sprd_dpu_stop(struct sprd_dpu *dpu) > +{ > + struct dpu_context *ctx = &dpu->ctx; > + > + if (ctx->if_type == SPRD_DPU_IF_DPI) > + dpu_reg_set(ctx, REG_DPU_CTRL, BIT_DPU_STOP); > + > + dpu_wait_stop_done(dpu); > +} > + > +static int sprd_plane_atomic_check(struct drm_plane *plane, > + struct drm_plane_state *state) > +{ > + struct drm_framebuffer *fb = state->fb; > + struct drm_crtc_state *crtc_state; > + u32 fmt; > + > + if (!fb || !state->crtc) > + return 0; > + > + fmt = drm_format_to_dpu(fb); > + if (!fmt) > + return -EINVAL; > + > + crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc); > + if (IS_ERR(crtc_state)) > + return PTR_ERR(crtc_state); > + > + return drm_atomic_helper_check_plane_state(state, crtc_state, > + DRM_PLANE_HELPER_NO_SCALING, > + DRM_PLANE_HELPER_NO_SCALING, > + true, true); > +} > + > +static void sprd_plane_atomic_update(struct drm_plane *plane, > + struct drm_plane_state *old_state) > +{ > + struct drm_plane_state *state = plane->state; > + struct sprd_plane *p = to_sprd_plane(plane); > + struct sprd_dpu *dpu = to_sprd_crtc(state->crtc); > + > + /* start configure dpu layers */ > + sprd_dpu_layer(dpu, p, state); > +} > + > +static void sprd_plane_atomic_disable(struct drm_plane *plane, > + struct drm_plane_state *old_state) > +{ > + struct sprd_plane *p = to_sprd_plane(plane); > + struct sprd_dpu *dpu = to_sprd_crtc(old_state->crtc); > + > + layer_reg_wr(&dpu->ctx, REG_LAY_CTRL, 0x00, p->index); > +} > + > +static void sprd_plane_create_properties(struct sprd_plane *p, int index) > +{ > + unsigned int supported_modes = BIT(DRM_MODE_BLEND_PIXEL_NONE) | > + BIT(DRM_MODE_BLEND_PREMULTI) | > + BIT(DRM_MODE_BLEND_COVERAGE); > + > + /* create rotation property */ > + drm_plane_create_rotation_property(&p->plane, > + DRM_MODE_ROTATE_0, > + DRM_MODE_ROTATE_MASK | > + DRM_MODE_REFLECT_MASK); > + > + /* create alpha property */ > + drm_plane_create_alpha_property(&p->plane); > + > + /* create blend mode property */ > + drm_plane_create_blend_mode_property(&p->plane, supported_modes); > + > + /* create zpos property */ > + drm_plane_create_zpos_immutable_property(&p->plane, index); > +} > + > +static const struct drm_plane_helper_funcs sprd_plane_helper_funcs = { > + .atomic_check = sprd_plane_atomic_check, > + .atomic_update = sprd_plane_atomic_update, > + .atomic_disable = sprd_plane_atomic_disable, > +}; > + > +static const struct drm_plane_funcs sprd_plane_funcs = { > + .update_plane = drm_atomic_helper_update_plane, > + .disable_plane = drm_atomic_helper_disable_plane, > + .destroy = drm_plane_cleanup, > + .reset = drm_atomic_helper_plane_reset, > + .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state, > + .atomic_destroy_state = drm_atomic_helper_plane_destroy_state, > +}; > + > +static struct drm_plane *sprd_plane_init(struct drm_device *drm, > + struct sprd_dpu *dpu) > +{ > + struct drm_plane *primary = NULL; > + struct sprd_plane *p = NULL; > + int ret, i; > + > + for (i = 0; i < 6; i++) { > + p = devm_kzalloc(drm->dev, sizeof(*p), GFP_KERNEL); You still have a devm_kzalloc here. We've just landed some neat new drmm_ helpers to allocate planes, please use these instead. See drmm_universal_plane_alloc(). </blockquote><div>Got it! </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> > + if (!p) > + return ERR_PTR(-ENOMEM); > + > + ret = drm_universal_plane_init(drm, &p->plane, 1, > + &sprd_plane_funcs, primary_fmts, > + ARRAY_SIZE(primary_fmts), NULL, > + DRM_PLANE_TYPE_PRIMARY, NULL); > + if (ret) { > + drm_err(drm, "fail to init primary plane\n"); > + return ERR_PTR(ret); > + } > + > + drm_plane_helper_add(&p->plane, &sprd_plane_helper_funcs); > + > + sprd_plane_create_properties(p, i); > + > + p->index = i; > + if (i == 0) > + primary = &p->plane; > + } > + > + return primary; > +} > + > +static enum drm_mode_status sprd_crtc_mode_valid(struct drm_crtc *crtc, > + const struct drm_display_mode *mode) > +{ > + struct sprd_dpu *dpu = to_sprd_crtc(crtc); > + > + drm_dbg(dpu->drm, "%s() mode: "DRM_MODE_FMT"\n", __func__, DRM_MODE_ARG(mode)); > + > + if (mode->type & DRM_MODE_TYPE_PREFERRED) { > + drm_display_mode_to_videomode(mode, &dpu->ctx.vm); > + > + if ((mode->hdisplay == mode->htotal) || > + (mode->vdisplay == mode->vtotal)) > + dpu->ctx.if_type = SPRD_DPU_IF_EDPI; > + else > + dpu->ctx.if_type = SPRD_DPU_IF_DPI; > + } > + > + return MODE_OK; > +} > + > +static void sprd_crtc_atomic_enable(struct drm_crtc *crtc, > + struct drm_crtc_state *old_state) > +{ > + struct sprd_dpu *dpu = to_sprd_crtc(crtc); > + > + sprd_dpu_init(dpu); > + > + sprd_dpi_init(dpu); > + > + enable_irq(dpu->ctx.irq); > + > + drm_crtc_vblank_on(&dpu->crtc); > +} > + > +static void sprd_crtc_atomic_disable(struct drm_crtc *crtc, > + struct drm_crtc_state *old_state) > +{ > + struct sprd_dpu *dpu = to_sprd_crtc(crtc); > + struct drm_device *drm = dpu-><a href="http://crtc.dev" rel="noreferrer" target="_blank">crtc.dev</a>; > + > + drm_crtc_vblank_off(&dpu->crtc); > + > + disable_irq(dpu->ctx.irq); > + > + sprd_dpu_fini(dpu); > + > + spin_lock_irq(&drm->event_lock); > + if (crtc->state->event) { > + drm_crtc_send_vblank_event(crtc, crtc->state->event); > + crtc->state->event = NULL; > + } > + spin_unlock_irq(&drm->event_lock); > +} > + > +static int sprd_crtc_atomic_check(struct drm_crtc *crtc, > + struct drm_crtc_state *state) > +{ > + drm_dbg(crtc->dev, "%s()\n", __func__); > + > + return 0; > +} > + > +static void sprd_crtc_atomic_flush(struct drm_crtc *crtc, > + struct drm_crtc_state *old_state) > + > +{ > + struct sprd_dpu *dpu = to_sprd_crtc(crtc); > + struct drm_device *drm = dpu-><a href="http://crtc.dev" rel="noreferrer" target="_blank">crtc.dev</a>; > + > + sprd_dpu_flip(dpu); > + > + spin_lock_irq(&drm->event_lock); > + if (crtc->state->event) { > + drm_crtc_send_vblank_event(crtc, crtc->state->event); > + crtc->state->event = NULL; > + } > + spin_unlock_irq(&drm->event_lock); > +} > + > +static int sprd_crtc_enable_vblank(struct drm_crtc *crtc) > +{ > + struct sprd_dpu *dpu = to_sprd_crtc(crtc); > + > + dpu_reg_set(&dpu->ctx, REG_DPU_INT_EN, BIT_DPU_INT_VSYNC); > + > + return 0; > +} > + > +static void sprd_crtc_disable_vblank(struct drm_crtc *crtc) > +{ > + struct sprd_dpu *dpu = to_sprd_crtc(crtc); > + > + dpu_reg_clr(&dpu->ctx, REG_DPU_INT_EN, BIT_DPU_INT_VSYNC); > +} > + > +static const struct drm_crtc_helper_funcs sprd_crtc_helper_funcs = { > + .mode_valid = sprd_crtc_mode_valid, > + .atomic_check = sprd_crtc_atomic_check, > + .atomic_flush = sprd_crtc_atomic_flush, > + .atomic_enable = sprd_crtc_atomic_enable, > + .atomic_disable = sprd_crtc_atomic_disable, > +}; > + > +static const struct drm_crtc_funcs sprd_crtc_funcs = { > + .destroy = drm_crtc_cleanup, > + .set_config = drm_atomic_helper_set_config, > + .page_flip = drm_atomic_helper_page_flip, > + .reset = drm_atomic_helper_crtc_reset, > + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, > + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, > + .enable_vblank = sprd_crtc_enable_vblank, > + .disable_vblank = sprd_crtc_disable_vblank, > +}; > + > +static int sprd_crtc_init(struct drm_device *drm, struct drm_crtc *crtc, > + struct drm_plane *primary) > +{ > + struct device_node *port; > + int ret; > + > + /* > + * set crtc port so that drm_of_find_possible_crtcs call works > + */ > + port = of_parse_phandle(drm->dev->of_node, "ports", 0); > + if (!port) { > + drm_err(drm, "find 'ports' phandle of %s failed\n", > + drm->dev->of_node->full_name); > + return -EINVAL; > + } > + of_node_put(port); > + crtc->port = port; > + > + ret = drm_crtc_init_with_planes(drm, crtc, primary, NULL, > + &sprd_crtc_funcs, NULL); > + if (ret) { > + drm_err(drm, "failed to init crtc.\n"); > + return ret; > + } > + > + drm_crtc_helper_add(crtc, &sprd_crtc_helper_funcs); > + > + return 0; > +} > + > +static irqreturn_t sprd_dpu_isr(int irq, void *data) > +{ > + struct sprd_dpu *dpu = data; > + struct dpu_context *ctx = &dpu->ctx; > + u32 reg_val, int_mask = 0; > + > + reg_val = readl(ctx->base + REG_DPU_INT_STS); > + > + /* disable err interrupt */ > + if (reg_val & BIT_DPU_INT_ERR) { > + int_mask |= BIT_DPU_INT_ERR; > + drm_warn(dpu->drm, "Warning: dpu underflow!\n"); > + } > + > + /* dpu update done isr */ > + if (reg_val & BIT_DPU_INT_UPDATE_DONE) { > + ctx->evt_update = true; > + wake_up_interruptible_all(&ctx->wait_queue); > + } > + > + /* dpu stop done isr */ > + if (reg_val & BIT_DPU_INT_DONE) { > + ctx->evt_stop = true; > + wake_up_interruptible_all(&ctx->wait_queue); > + } > + > + if (reg_val & BIT_DPU_INT_VSYNC) > + drm_crtc_handle_vblank(&dpu->crtc); > + > + int_mask |= check_mmu_isr(dpu, reg_val); > + > + writel(reg_val, ctx->base + REG_DPU_INT_CLR); > + dpu_reg_clr(ctx, REG_DPU_INT_EN, int_mask); > + > + return IRQ_HANDLED; > +} > + > +static int sprd_dpu_bind(struct device *dev, struct device *master, void *data) > +{ > + struct drm_device *drm = data; > + struct sprd_dpu *dpu = dev_get_drvdata(dev); > + struct drm_plane *plane; > + int ret; > + > + plane = sprd_plane_init(drm, dpu); > + if (IS_ERR_OR_NULL(plane)) { > + ret = PTR_ERR(plane); > + return ret; > + } > + > + ret = sprd_crtc_init(drm, &dpu->crtc, plane); > + if (ret) > + return ret; > + > + dpu->drm = drm; > + > + return 0; > +} > + > +static void sprd_dpu_unbind(struct device *dev, struct device *master, > + void *data) > +{ > + struct sprd_dpu *dpu = dev_get_drvdata(dev); > + > + drm_crtc_cleanup(&dpu->crtc); > +} > + > +static const struct component_ops dpu_component_ops = { > + .bind = sprd_dpu_bind, > + .unbind = sprd_dpu_unbind, > +}; > + > +static int sprd_dpu_context_init(struct sprd_dpu *dpu, > + struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct dpu_context *ctx = &dpu->ctx; > + struct resource *res; > + int ret; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + ctx->base = devm_ioremap(dev, res->start, resource_size(res)); > + if (!ctx->base) { > + dev_err(dev, "failed to map dpu registers\n"); > + return -EFAULT; > + } > + > + ctx->irq = platform_get_irq(pdev, 0); > + if (ctx->irq < 0) { > + dev_err(dev, "failed to get dpu irq\n"); > + return ctx->irq; > + } > + > + irq_set_status_flags(ctx->irq, IRQ_NOAUTOEN); > + ret = devm_request_irq(dev, ctx->irq, sprd_dpu_isr, > + 0, "DPU", dpu); > + if (ret) { > + dev_err(dev, "failed to register dpu irq handler\n"); > + return ret; > + } > + > + init_waitqueue_head(&ctx->wait_queue); > + > + return 0; > +} > + > +static const struct of_device_id dpu_match_table[] = { > + { .compatible = "sprd,sharkl3-dpu" }, > + { /* sentinel */ }, > +}; > + > +static int sprd_dpu_probe(struct platform_device *pdev) > +{ > + struct sprd_dpu *dpu; > + int ret; > + > + dpu = kzalloc(sizeof(*dpu), GFP_KERNEL); > + if (!dpu) > + return -ENOMEM; > + > + ret = sprd_dpu_context_init(dpu, &pdev->dev); > + if (ret) { > + kfree(dpu); > + return ret; > + } > + > + platform_set_drvdata(pdev, dpu); The above should be moved into your bind function, with that you can allocate the struct sprd_dpu with drmm_crtc_alloc_with_planes() and remove a bunch of cleanup code. </blockquote><div>Got it, it seems unbind ops(drm_crtc_cleanup) is also no need here. </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> > + > + return component_add(&pdev->dev, &dpu_component_ops); > +} > + > +static int sprd_dpu_remove(struct platform_device *pdev) > +{ > + struct sprd_dpu *dpu = platform_get_drvdata(pdev); > + > + component_del(&pdev->dev, &dpu_component_ops); > + > + kfree(dpu); The kfree here is wrong, you'd need to hook into the ->destroy hook of the drm_crtc_funcs, but if you're using drmm_ like suggested above it should all work including driver unload and any ordering issues with deferred_probe. </blockquote><div>Got it! </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> > + return 0; > +} > + > +struct platform_driver sprd_dpu_driver = { > + .probe = sprd_dpu_probe, > + .remove = sprd_dpu_remove, > + .driver = { > + .name = "sprd-dpu-drv", > + .of_match_table = dpu_match_table, > + }, > +}; > + > +MODULE_AUTHOR("Leon He <<a href="mailto:leon.he@unisoc.com" target="_blank">leon.he@unisoc.com</a>>"); > +MODULE_AUTHOR("Kevin Tang <<a href="mailto:kevin.tang@unisoc.com" target="_blank">kevin.tang@unisoc.com</a>>"); > +MODULE_DESCRIPTION("Unisoc Display Controller Driver"); > +MODULE_LICENSE("GPL v2"); > diff --git a/drivers/gpu/drm/sprd/sprd_dpu.h b/drivers/gpu/drm/sprd/sprd_dpu.h > new file mode 100644 > index 0000000..a937ba1 > --- /dev/null > +++ b/drivers/gpu/drm/sprd/sprd_dpu.h > @@ -0,0 +1,120 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (C) 2020 Unisoc Inc. > + */ > + > +#ifndef __SPRD_DPU_H__ > +#define __SPRD_DPU_H__ > + > +#include <linux/bug.h> > +#include <linux/delay.h> > +#include <linux/device.h> > +#include <linux/kernel.h> > +#include <linux/platform_device.h> > +#include <linux/string.h> > +#include <video/videomode.h> > + > +#include <drm/drm_crtc.h> > +#include <drm/drm_fourcc.h> > +#include <drm/drm_print.h> > +#include <drm/drm_vblank.h> > +#include <uapi/drm/drm_mode.h> > + > +/* DPU Layer registers offset */ > +#define DPU_LAY_REG_OFFSET 0x30 > + > +enum { > + SPRD_DPU_IF_DBI = 0, > + SPRD_DPU_IF_DPI, > + SPRD_DPU_IF_EDPI, > + SPRD_DPU_IF_LIMIT > +}; > + > +enum { > + DPU_LAYER_ROTATION_0, > + DPU_LAYER_ROTATION_90, > + DPU_LAYER_ROTATION_180, > + DPU_LAYER_ROTATION_270, > + DPU_LAYER_ROTATION_0_M, > + DPU_LAYER_ROTATION_90_M, > + DPU_LAYER_ROTATION_180_M, > + DPU_LAYER_ROTATION_270_M, > +}; > + > +/** > + * Sprd DPU context structure > + * > + * @base: DPU controller base address > + * @irq: IRQ number to install the handler for > + * @if_type: The type of DPI interface, default is DPI mode. > + * @vm: videomode structure to use for DPU and DPI initialization > + * @stopped: indicates whether DPU are stopped > + * @wait_queue: wait queue, used to wait for DPU shadow register update done and > + * DPU stop register done interrupt signal. > + * @evt_update: wait queue condition for DPU shadow register > + * @evt_stop: wait queue condition for DPU stop register > + */ > +struct dpu_context { > + void __iomem *base; > + int irq; > + u8 if_type; > + struct videomode vm; > + bool stopped; > + wait_queue_head_t wait_queue; > + bool evt_update; > + bool evt_stop; > +}; > + > +/** > + * Sprd DPU device structure > + * > + * @crtc: DRM crtc > + * @ctx: A pointer to the DPU's implementation specific context > + */ > +struct sprd_dpu { > + struct drm_crtc crtc; > + struct drm_device *drm; > + struct dpu_context ctx; > +}; > + > +static inline struct sprd_dpu *to_sprd_crtc(struct drm_crtc *crtc) > +{ > + return container_of(crtc, struct sprd_dpu, crtc); > +} > + > +static inline void > +dpu_reg_set(struct dpu_context *ctx, u32 offset, u32 set_bits) > +{ > + u32 bits = readl_relaxed(ctx->base + offset); > + > + writel(bits | set_bits, ctx->base + offset); > +} > + > +static inline void > +dpu_reg_clr(struct dpu_context *ctx, u32 offset, u32 clr_bits) > +{ > + u32 bits = readl_relaxed(ctx->base + offset); > + > + writel(bits & ~clr_bits, ctx->base + offset); > +} > + > +static inline u32 > +layer_reg_rd(struct dpu_context *ctx, u32 offset, int index) > +{ > + u32 layer_offset = offset + index * DPU_LAY_REG_OFFSET; > + > + return readl(ctx->base + layer_offset); > +} > + > +static inline void > +layer_reg_wr(struct dpu_context *ctx, u32 offset, u32 cfg_bits, int index) > +{ > + u32 layer_offset = offset + index * DPU_LAY_REG_OFFSET; > + > + writel(cfg_bits, ctx->base + layer_offset); > +} > + > +void sprd_dpu_run(struct sprd_dpu *dpu); > +void sprd_dpu_stop(struct sprd_dpu *dpu); > + > +#endif > diff --git a/drivers/gpu/drm/sprd/sprd_drm.c b/drivers/gpu/drm/sprd/sprd_drm.c > index ec101de..ca93be2 100644 > --- a/drivers/gpu/drm/sprd/sprd_drm.c > +++ b/drivers/gpu/drm/sprd/sprd_drm.c > @@ -196,6 +196,7 @@ static struct platform_driver sprd_drm_driver = { > > static struct platform_driver *sprd_drm_drivers[] = { > &sprd_drm_driver, > + &sprd_dpu_driver, > }; > > static int __init sprd_drm_init(void) > diff --git a/drivers/gpu/drm/sprd/sprd_drm.h b/drivers/gpu/drm/sprd/sprd_drm.h > index 9781fd5..85d4a8b 100644 > --- a/drivers/gpu/drm/sprd/sprd_drm.h > +++ b/drivers/gpu/drm/sprd/sprd_drm.h > @@ -13,4 +13,6 @@ struct sprd_drm { > struct drm_device drm; > }; > > +extern struct platform_driver sprd_dpu_driver; > + > #endif /* _SPRD_DRM_H_ */ > -- > 2.7.4 > -- Daniel Vetter Software Engineer, Intel Corporation <a href="http://blog.ffwll.ch" rel="noreferrer" target="_blank">http://blog.ffwll.ch</a> </blockquote></div></div>