[PATCH 2/5] gpu: drm: adp: Add Apple Display Pipe driver
Sasha Finkelstein via B4 Relay
devnull+fnkl.kernel.gmail.com at kernel.org
Sun Nov 24 22:29:25 UTC 2024
From: Sasha Finkelstein <fnkl.kernel at gmail.com>
This display controller is present on M-series chips and is used
to drive the touchbar display.
Co-developed-by: Janne Grunau <j at jannau.net>
Signed-off-by: Janne Grunau <j at jannau.net>
Signed-off-by: Sasha Finkelstein <fnkl.kernel at gmail.com>
---
drivers/gpu/drm/Kconfig | 2 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/adp/Kconfig | 14 +
drivers/gpu/drm/adp/Makefile | 5 +
drivers/gpu/drm/adp/adp_drv.c | 814 ++++++++++++++++++++++++++++++++++++++++++
5 files changed, 836 insertions(+)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 5504721007cc190e7d768d42aa9633baa0115f5e..acd1111f1773ef044c306c62ad9f850996259ef1 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -499,6 +499,8 @@ source "drivers/gpu/drm/mcde/Kconfig"
source "drivers/gpu/drm/tidss/Kconfig"
+source "drivers/gpu/drm/adp/Kconfig"
+
source "drivers/gpu/drm/xlnx/Kconfig"
source "drivers/gpu/drm/gud/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 463afad1b5ca6275e61223adc8ca036c3d4d6b03..acd8d8943ef2bf85c80db7c218c59a7ec2df56da 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -213,6 +213,7 @@ obj-y += mxsfb/
obj-y += tiny/
obj-$(CONFIG_DRM_PL111) += pl111/
obj-$(CONFIG_DRM_TVE200) += tve200/
+obj-$(CONFIG_DRM_ADP) += adp/
obj-$(CONFIG_DRM_XEN) += xen/
obj-$(CONFIG_DRM_VBOXVIDEO) += vboxvideo/
obj-$(CONFIG_DRM_LIMA) += lima/
diff --git a/drivers/gpu/drm/adp/Kconfig b/drivers/gpu/drm/adp/Kconfig
new file mode 100644
index 0000000000000000000000000000000000000000..3c570aeb14700611edd7e2738367090ebb30c346
--- /dev/null
+++ b/drivers/gpu/drm/adp/Kconfig
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0-only OR MIT
+config DRM_ADP
+ tristate "DRM Support for pre-DCP Apple display controllers"
+ depends on DRM && OF && ARM64
+ depends on ARCH_APPLE || COMPILE_TEST
+ select DRM_KMS_HELPER
+ select DRM_KMS_DMA_HELPER
+ select DRM_GEM_DMA_HELPER
+ select VIDEOMODE_HELPERS
+ select DRM_MIPI_DSI
+ help
+ Chose this option if you have an Apple Arm laptop with a touchbar.
+
+ If M is selected, this module will be called adpdrm.
diff --git a/drivers/gpu/drm/adp/Makefile b/drivers/gpu/drm/adp/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..28a5d4b4a267f3e2abe9f0ea9e11fae51ca18b88
--- /dev/null
+++ b/drivers/gpu/drm/adp/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only OR MIT
+
+adpdrm-y := adp_drv.o
+obj-$(CONFIG_DRM_ADP) += adpdrm.o
+obj-$(CONFIG_DRM_ADP) += panel-summit.o
diff --git a/drivers/gpu/drm/adp/adp_drv.c b/drivers/gpu/drm/adp/adp_drv.c
new file mode 100644
index 0000000000000000000000000000000000000000..36510194e18161ef6514885c764b2e7085c587e5
--- /dev/null
+++ b/drivers/gpu/drm/adp/adp_drv.c
@@ -0,0 +1,814 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/anon_inodes.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/file.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+
+#include <asm/current.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_device.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fb_dma_helper.h>
+#include <drm/drm_file.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+#include <drm/drm_vblank.h>
+
+#define ADP_INT_STATUS 0x34
+#define ADP_INT_STATUS_INT_MASK 0x7
+#define ADP_INT_STATUS_VBLANK 0x1
+#define ADP_CTRL 0x100
+#define ADP_CTRL_VBLANK_ON 0x12
+#define ADP_CTRL_FIFO_ON 0x601
+#define ADP_SCREEN_SIZE 0x0c
+#define ADP_SCREEN_HSIZE GENMASK(15, 0)
+#define ADP_SCREEN_VSIZE GENMASK(31, 16)
+
+#define ADBE_FIFO 0x10c0
+#define ADBE_FIFO_SYNC 0xc0000000
+
+#define ADBE_BLEND_BYPASS 0x2020
+#define ADBE_BLEND_EN1 0x2028
+#define ADBE_BLEND_EN2 0x2074
+#define ADBE_BLEND_EN3 0x202c
+#define ADBE_BLEND_EN4 0x2034
+#define ADBE_MASK_BUF 0x2200
+
+#define ADBE_SRC_START 0x4040
+#define ADBE_SRC_SIZE 0x4048
+#define ADBE_DST_START 0x4050
+#define ADBE_DST_SIZE 0x4054
+#define ADBE_STRIDE 0x4038
+#define ADBE_FB_BASE 0x4030
+
+#define ADBE_LAYER_EN1 0x4020
+#define ADBE_LAYER_EN2 0x4068
+#define ADBE_LAYER_EN3 0x40b4
+#define ADBE_LAYER_EN4 0x40f4
+#define ADBE_SCALE_CTL 0x40ac
+#define ADBE_SCALE_CTL_BYPASS 0x100000
+
+#define ADBE_LAYER_CTL 0x1038
+#define ADBE_LAYER_CTL_ENABLE 0x10000
+
+#define ADBE_PIX_FMT 0x402c
+#define ADBE_PIX_FMT_XRGB32 0x53e4001
+
+#define DSI_GEN_HDR 0x6c
+#define DSI_GEN_PLD_DATA 0x70
+
+#define DSI_CMD_PKT_STATUS 0x74
+
+#define GEN_PLD_R_EMPTY BIT(4)
+#define GEN_PLD_W_FULL BIT(3)
+#define GEN_PLD_W_EMPTY BIT(2)
+#define GEN_CMD_FULL BIT(1)
+#define GEN_CMD_EMPTY BIT(0)
+#define GEN_RD_CMD_BUSY BIT(6)
+#define CMD_PKT_STATUS_TIMEOUT_US 20000
+
+static int adp_open(struct inode *inode, struct file *filp)
+{
+ /*
+ * The modesetting driver does not check the non-desktop connector
+ * property and keeps the device open and locked. If the touchbar daemon
+ * opens the device first modesetting breaks the whole X session.
+ * Simply refuse to open the device for X11 server processes as
+ * workaround.
+ */
+ if (current->comm[0] == 'X')
+ return -EBUSY;
+
+ return drm_open(inode, filp);
+}
+
+static const struct file_operations adp_fops = {
+ .owner = THIS_MODULE,
+ .open = adp_open,
+ .release = drm_release,
+ .unlocked_ioctl = drm_ioctl,
+ .compat_ioctl = drm_compat_ioctl,
+ .poll = drm_poll,
+ .read = drm_read,
+ .llseek = noop_llseek,
+ .mmap = drm_gem_mmap,
+ .fop_flags = FOP_UNSIGNED_OFFSET,
+ DRM_GEM_DMA_UNMAPPED_AREA_FOPS
+};
+
+static int adp_drm_gem_dumb_create(struct drm_file *file_priv,
+ struct drm_device *drm,
+ struct drm_mode_create_dumb *args)
+{
+ args->height = ALIGN(args->height, 64);
+ args->size = args->pitch * args->height;
+
+ return drm_gem_dma_dumb_create_internal(file_priv, drm, args);
+}
+
+static const struct drm_driver adp_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+ .fops = &adp_fops,
+ DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(adp_drm_gem_dumb_create),
+ .name = "adp",
+ .desc = "Apple Display Pipe DRM Driver",
+ .date = "20230412",
+ .major = 0,
+ .minor = 1,
+};
+
+struct adp_drv_private {
+ struct drm_device drm;
+ struct drm_crtc crtc;
+ struct drm_encoder encoder;
+ struct drm_connector connector;
+ struct mipi_dsi_host dsi;
+ void __iomem *be;
+ void __iomem *fe;
+ void __iomem *mipi;
+ u32 *mask_buf;
+ u64 mask_buf_size;
+ dma_addr_t mask_iova;
+ int be_irq;
+ int fe_irq;
+ spinlock_t irq_lock;
+ struct drm_pending_vblank_event *event;
+};
+
+struct adp_plane {
+ struct drm_plane base_plane;
+ u8 id;
+};
+
+#define to_adp(x) container_of(x, struct adp_drv_private, drm)
+#define crtc_to_adp(x) container_of(x, struct adp_drv_private, crtc)
+#define conn_to_adp(x) container_of(x, struct adp_drv_private, connector)
+#define mipi_to_adp(x) container_of(x, struct adp_drv_private, dsi)
+
+static int adp_plane_atomic_check(struct drm_plane *plane,
+ struct drm_atomic_state *state)
+{
+ struct drm_plane_state *new_plane_state;
+ struct drm_crtc_state *crtc_state;
+
+ new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+
+ if (!new_plane_state->crtc)
+ return 0;
+
+ crtc_state = drm_atomic_get_crtc_state(state, new_plane_state->crtc);
+ if (IS_ERR(crtc_state))
+ return PTR_ERR(crtc_state);
+ return drm_atomic_helper_check_plane_state(new_plane_state,
+ crtc_state,
+ DRM_PLANE_NO_SCALING,
+ DRM_PLANE_NO_SCALING,
+ true, true);
+}
+
+static void adp_plane_atomic_update(struct drm_plane *plane,
+ struct drm_atomic_state *state)
+{
+ struct adp_drv_private *adp;
+ struct drm_rect src_rect;
+ struct drm_gem_dma_object *obj;
+ struct drm_framebuffer *fb;
+ struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state, plane);
+ u32 src_pos, src_size, dst_pos, dst_size;
+
+ if (!plane || !new_state)
+ return;
+
+ fb = new_state->fb;
+ if (!fb)
+ return;
+ adp = to_adp(plane->dev);
+
+ drm_rect_fp_to_int(&src_rect, &new_state->src);
+ src_pos = src_rect.x1 << 16 | src_rect.y1;
+ dst_pos = new_state->dst.x1 << 16 | new_state->dst.y1;
+ src_size = drm_rect_width(&src_rect) << 16 | drm_rect_height(&src_rect);
+ dst_size = drm_rect_width(&new_state->dst) << 16 |
+ drm_rect_height(&new_state->dst);
+ writel(src_pos, adp->be + ADBE_SRC_START);
+ writel(src_size, adp->be + ADBE_SRC_SIZE);
+ writel(dst_pos, adp->be + ADBE_DST_START);
+ writel(dst_size, adp->be + ADBE_DST_SIZE);
+ writel(fb->pitches[0], adp->be + ADBE_STRIDE);
+ obj = drm_fb_dma_get_gem_obj(fb, 0);
+ if (obj)
+ writel(obj->dma_addr + fb->offsets[0], adp->be + ADBE_FB_BASE);
+
+ writel(0x1, adp->be + ADBE_LAYER_EN1);
+ writel(0x1, adp->be + ADBE_LAYER_EN2);
+ writel(0x1, adp->be + ADBE_LAYER_EN3);
+ writel(0x1, adp->be + ADBE_LAYER_EN4);
+ writel(ADBE_SCALE_CTL_BYPASS, adp->be + ADBE_SCALE_CTL);
+ writel(ADBE_LAYER_CTL_ENABLE | 0x1, adp->be + ADBE_LAYER_CTL);
+ writel(ADBE_PIX_FMT_XRGB32, adp->be + ADBE_PIX_FMT);
+
+}
+
+static void adp_plane_atomic_disable(struct drm_plane *plane,
+ struct drm_atomic_state *state)
+{
+ struct adp_drv_private *adp = to_adp(plane->dev);
+
+ writel(0x0, adp->be + ADBE_LAYER_EN1);
+ writel(0x0, adp->be + ADBE_LAYER_EN2);
+ writel(0x0, adp->be + ADBE_LAYER_EN3);
+ writel(0x0, adp->be + ADBE_LAYER_EN4);
+ writel(ADBE_LAYER_CTL_ENABLE, adp->be + ADBE_LAYER_CTL);
+}
+
+static const struct drm_plane_helper_funcs adp_plane_helper_funcs = {
+ .atomic_check = adp_plane_atomic_check,
+ .atomic_update = adp_plane_atomic_update,
+ .atomic_disable = adp_plane_atomic_disable,
+ DRM_GEM_SHADOW_PLANE_HELPER_FUNCS
+};
+
+static const struct drm_plane_funcs adp_plane_funcs = {
+ .update_plane = drm_atomic_helper_update_plane,
+ .disable_plane = drm_atomic_helper_disable_plane,
+ DRM_GEM_SHADOW_PLANE_FUNCS
+};
+
+static const u32 plane_formats[] = {
+ DRM_FORMAT_XRGB8888,
+};
+
+#define ALL_CRTCS 1
+
+static struct adp_plane *adp_plane_new(struct adp_drv_private *adp, u8 id)
+{
+ struct drm_device *drm = &adp->drm;
+ struct adp_plane *plane;
+ enum drm_plane_type plane_type;
+
+ plane_type = (id == 0) ? DRM_PLANE_TYPE_PRIMARY :
+ DRM_PLANE_TYPE_OVERLAY;
+
+ plane = drmm_universal_plane_alloc(drm, struct adp_plane, base_plane,
+ ALL_CRTCS, &adp_plane_funcs,
+ plane_formats, ARRAY_SIZE(plane_formats),
+ NULL, plane_type, "plane %d", id);
+ if (!plane) {
+ drm_err(drm, "failed to allocate plane");
+ return ERR_PTR(-ENOMEM);
+ }
+ plane->id = id;
+
+ drm_plane_helper_add(&plane->base_plane, &adp_plane_helper_funcs);
+ return plane;
+}
+
+static void adp_enable_vblank(struct adp_drv_private *adp)
+{
+ u32 cur_ctrl;
+
+ writel(ADP_INT_STATUS_INT_MASK, adp->fe + ADP_INT_STATUS);
+
+ cur_ctrl = readl(adp->fe + ADP_CTRL);
+ writel(cur_ctrl | ADP_CTRL_VBLANK_ON, adp->fe + ADP_CTRL);
+}
+
+static int adp_crtc_enable_vblank(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+ struct adp_drv_private *adp = to_adp(dev);
+
+ adp_enable_vblank(adp);
+
+ return 0;
+}
+
+static void adp_disable_vblank(struct adp_drv_private *adp)
+{
+ u32 cur_ctrl;
+
+ cur_ctrl = readl(adp->fe + ADP_CTRL);
+ writel(cur_ctrl & ~ADP_CTRL_VBLANK_ON, adp->fe + ADP_CTRL);
+ writel(ADP_INT_STATUS_INT_MASK, adp->fe + ADP_INT_STATUS);
+}
+
+static void adp_crtc_disable_vblank(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+ struct adp_drv_private *adp = to_adp(dev);
+
+ adp_disable_vblank(adp);
+}
+
+
+static void adp_crtc_atomic_enable(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ struct adp_drv_private *adp = crtc_to_adp(crtc);
+
+ writel(0x1, adp->be + ADBE_BLEND_EN2);
+ writel(0x10, adp->be + ADBE_BLEND_EN1);
+ writel(0x1, adp->be + ADBE_BLEND_EN3);
+ writel(0x1, adp->be + ADBE_BLEND_BYPASS);
+ writel(0x1, adp->be + ADBE_BLEND_EN4);
+}
+
+static void adp_crtc_atomic_disable(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ struct adp_drv_private *adp = crtc_to_adp(crtc);
+ struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state, crtc);
+
+ drm_atomic_helper_disable_planes_on_crtc(old_state, false);
+
+ writel(0x0, adp->be + ADBE_BLEND_EN2);
+ writel(0x0, adp->be + ADBE_BLEND_EN1);
+ writel(0x0, adp->be + ADBE_BLEND_EN3);
+ writel(0x0, adp->be + ADBE_BLEND_BYPASS);
+ writel(0x0, adp->be + ADBE_BLEND_EN4);
+ drm_crtc_vblank_off(crtc);
+}
+
+static void adp_crtc_atomic_flush(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ u32 frame_num = 1;
+ struct adp_drv_private *adp = crtc_to_adp(crtc);
+ struct drm_crtc_state *new_state = drm_atomic_get_new_crtc_state(state, crtc);
+ u64 new_size = ALIGN(new_state->mode.hdisplay *
+ new_state->mode.vdisplay * 4, PAGE_SIZE);
+
+ if (new_size != adp->mask_buf_size) {
+ if (adp->mask_buf)
+ dma_free_coherent(crtc->dev->dev, adp->mask_buf_size,
+ adp->mask_buf, adp->mask_iova);
+ adp->mask_buf = NULL;
+ if (new_size != 0) {
+ adp->mask_buf = dma_alloc_coherent(crtc->dev->dev, new_size,
+ &adp->mask_iova, GFP_KERNEL);
+ memset(adp->mask_buf, 0xFF, new_size);
+ writel(adp->mask_iova, adp->be + ADBE_MASK_BUF);
+ }
+ adp->mask_buf_size = new_size;
+ }
+ writel(ADBE_FIFO_SYNC | frame_num, adp->be + ADBE_FIFO);
+ //FIXME: use adbe flush interrupt
+ spin_lock_irq(&crtc->dev->event_lock);
+ if (crtc->state->event) {
+ drm_crtc_vblank_get(crtc);
+ adp->event = crtc->state->event;
+ }
+ crtc->state->event = NULL;
+ spin_unlock_irq(&crtc->dev->event_lock);
+}
+
+static const struct drm_crtc_funcs adp_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 = adp_crtc_enable_vblank,
+ .disable_vblank = adp_crtc_disable_vblank,
+};
+
+
+static const struct drm_crtc_helper_funcs adp_crtc_helper_funcs = {
+ .atomic_enable = adp_crtc_atomic_enable,
+ .atomic_disable = adp_crtc_atomic_disable,
+ .atomic_flush = adp_crtc_atomic_flush,
+};
+
+static int adp_setup_crtc(struct adp_drv_private *adp)
+{
+ struct drm_device *drm = &adp->drm;
+ struct adp_plane *primary;
+ int ret;
+
+ primary = adp_plane_new(adp, 0);
+ if (IS_ERR(primary))
+ return PTR_ERR(primary);
+
+ ret = drm_crtc_init_with_planes(drm, &adp->crtc, &primary->base_plane,
+ NULL, &adp_crtc_funcs, NULL);
+ if (ret)
+ return ret;
+
+ drm_crtc_helper_add(&adp->crtc, &adp_crtc_helper_funcs);
+ return 0;
+}
+
+static int adp_get_modes(struct drm_connector *connector)
+{
+ struct adp_drv_private *adp = conn_to_adp(connector);
+ struct drm_display_mode *mode;
+ u32 size;
+
+ size = readl(adp->fe + ADP_SCREEN_SIZE);
+ mode = drm_mode_create(connector->dev);
+
+ mode->vdisplay = FIELD_GET(ADP_SCREEN_VSIZE, size);
+ mode->hdisplay = FIELD_GET(ADP_SCREEN_HSIZE, size);
+ mode->hsync_start = mode->hdisplay + 8;
+ mode->hsync_end = mode->hsync_start + 80;
+ mode->htotal = mode->hsync_end + 40;
+ mode->vsync_start = mode->vdisplay + 1;
+ mode->vsync_end = mode->vsync_start + 15;
+ mode->vtotal = mode->vsync_end + 6;
+ mode->clock = (mode->vtotal * mode->htotal * 60) / 1000;
+ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+ mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
+ drm_mode_set_name(mode);
+ drm_mode_probed_add(connector, mode);
+ return 1;
+}
+
+static int adp_detect_ctx(struct drm_connector *connector,
+ struct drm_modeset_acquire_ctx *ctx,
+ bool force)
+{
+ connector->display_info.non_desktop = true;
+ drm_object_property_set_value(&connector->base,
+ connector->dev->mode_config.non_desktop_property,
+ connector->display_info.non_desktop);
+ return connector_status_connected;
+}
+
+static const struct drm_connector_funcs adp_connector_funcs = {
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static const struct drm_connector_helper_funcs adp_connector_helper_funcs = {
+ .get_modes = adp_get_modes,
+ .detect_ctx = adp_detect_ctx,
+};
+
+static const struct drm_mode_config_funcs adp_mode_config_funcs = {
+ .fb_create = drm_gem_fb_create_with_dirty,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static int adp_setup_mode_config(struct adp_drv_private *adp)
+{
+ struct drm_device *drm = &adp->drm;
+ int ret;
+ u32 size;
+
+ ret = drmm_mode_config_init(drm);
+ if (ret)
+ return ret;
+
+ /*
+ * Query screen size restrict the frame buffer size to the screen size
+ * aligned to the next multiple of 64. This is not necessary but can be
+ * used as simple check for non-desktop devices.
+ * Xorg's modesetting driver does not care about the connector
+ * "non-desktop" property. The max frame buffer width or height can be
+ * easily checked and a device can be reject if the max width/height is
+ * smaller than 120 for example.
+ * Any touchbar daemon is not limited by this small framebuffer size.
+ */
+ size = readl(adp->fe + ADP_SCREEN_SIZE);
+
+ drm->mode_config.min_width = 32;
+ drm->mode_config.min_height = 32;
+ drm->mode_config.max_width = ALIGN(FIELD_GET(ADP_SCREEN_HSIZE, size), 64);
+ drm->mode_config.max_height = ALIGN(FIELD_GET(ADP_SCREEN_VSIZE, size), 64);
+ drm->mode_config.preferred_depth = 24;
+ drm->mode_config.prefer_shadow = 0;
+ drm->mode_config.funcs = &adp_mode_config_funcs;
+
+ ret = adp_setup_crtc(adp);
+ if (ret) {
+ drm_err(drm, "failed to create crtc");
+ return ret;
+ }
+
+ adp->encoder.possible_crtcs = ALL_CRTCS;
+ ret = drm_simple_encoder_init(drm, &adp->encoder, DRM_MODE_ENCODER_DSI);
+ if (ret) {
+ drm_err(drm, "failed to init encoder");
+ return ret;
+ }
+ drm_connector_helper_add(&adp->connector,
+ &adp_connector_helper_funcs);
+ ret = drm_connector_init(drm, &adp->connector, &adp_connector_funcs,
+ DRM_MODE_CONNECTOR_DSI);
+ if (ret)
+ return ret;
+
+ drm_connector_attach_encoder(&adp->connector, &adp->encoder);
+
+ ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+ if (ret < 0) {
+ drm_err(drm, "failed to initialize vblank");
+ return ret;
+ }
+
+ drm_mode_config_reset(drm);
+
+ return 0;
+}
+
+static int adp_parse_of(struct platform_device *pdev, struct adp_drv_private *adp)
+{
+ adp->be = devm_platform_ioremap_resource_byname(pdev, "be");
+ if (IS_ERR(adp->be)) {
+ dev_err(&pdev->dev, "failed to map display backend mmio");
+ return PTR_ERR(adp->be);
+ }
+
+ adp->fe = devm_platform_ioremap_resource_byname(pdev, "fe");
+ if (IS_ERR(adp->fe)) {
+ dev_err(&pdev->dev, "failed to map display pipe mmio");
+ return PTR_ERR(adp->fe);
+ }
+
+ adp->mipi = devm_platform_ioremap_resource_byname(pdev, "mipi");
+ if (IS_ERR(adp->mipi)) {
+ dev_err(&pdev->dev, "failed to map mipi mmio");
+ return PTR_ERR(adp->mipi);
+ }
+
+ adp->be_irq = platform_get_irq_byname(pdev, "be");
+ if (adp->be_irq < 0) {
+ dev_err(&pdev->dev, "failed to find be irq");
+ return adp->be_irq;
+ }
+
+ adp->fe_irq = platform_get_irq_byname(pdev, "fe");
+ if (adp->fe_irq < 0) {
+ dev_err(&pdev->dev, "failed to find fe irq");
+ return adp->fe_irq;
+ }
+ return 0;
+}
+
+
+static int adp_dsi_gen_pkt_hdr_write(struct adp_drv_private *adp, u32 hdr_val)
+{
+ int ret;
+ u32 val, mask;
+
+ ret = readl_poll_timeout(adp->mipi + DSI_CMD_PKT_STATUS,
+ val, !(val & GEN_CMD_FULL), 1000,
+ CMD_PKT_STATUS_TIMEOUT_US);
+ if (ret) {
+ dev_err(adp->drm.dev, "failed to get available command FIFO\n");
+ return ret;
+ }
+
+ writel(hdr_val, adp->mipi + DSI_GEN_HDR);
+
+ mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY;
+ ret = readl_poll_timeout(adp->mipi + DSI_CMD_PKT_STATUS,
+ val, (val & mask) == mask,
+ 1000, CMD_PKT_STATUS_TIMEOUT_US);
+ if (ret) {
+ dev_err(adp->drm.dev, "failed to write command FIFO\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int adp_dsi_write(struct adp_drv_private *adp,
+ const struct mipi_dsi_packet *packet)
+{
+ const u8 *tx_buf = packet->payload;
+ int len = packet->payload_length, pld_data_bytes = sizeof(u32), ret;
+ __le32 word;
+ u32 val;
+
+ while (len) {
+ if (len < pld_data_bytes) {
+ word = 0;
+ memcpy(&word, tx_buf, len);
+ writel(le32_to_cpu(word), adp->mipi + DSI_GEN_PLD_DATA);
+ len = 0;
+ } else {
+ memcpy(&word, tx_buf, pld_data_bytes);
+ writel(le32_to_cpu(word), adp->mipi + DSI_GEN_PLD_DATA);
+ tx_buf += pld_data_bytes;
+ len -= pld_data_bytes;
+ }
+
+ ret = readl_poll_timeout(adp->mipi + DSI_CMD_PKT_STATUS,
+ val, !(val & GEN_PLD_W_FULL), 1000,
+ CMD_PKT_STATUS_TIMEOUT_US);
+ if (ret) {
+ dev_err(adp->drm.dev,
+ "failed to get available write payload FIFO\n");
+ return ret;
+ }
+ }
+
+ word = 0;
+ memcpy(&word, packet->header, sizeof(packet->header));
+ return adp_dsi_gen_pkt_hdr_write(adp, le32_to_cpu(word));
+}
+
+static int adp_dsi_read(struct adp_drv_private *adp,
+ const struct mipi_dsi_msg *msg)
+{
+ int i, j, ret, len = msg->rx_len;
+ u8 *buf = msg->rx_buf;
+ u32 val;
+
+ /* Wait end of the read operation */
+ ret = readl_poll_timeout(adp->mipi + DSI_CMD_PKT_STATUS,
+ val, !(val & GEN_RD_CMD_BUSY),
+ 1000, CMD_PKT_STATUS_TIMEOUT_US);
+ if (ret) {
+ dev_err(adp->drm.dev, "Timeout during read operation\n");
+ return ret;
+ }
+
+ for (i = 0; i < len; i += 4) {
+ /* Read fifo must not be empty before all bytes are read */
+ ret = readl_poll_timeout(adp->mipi + DSI_CMD_PKT_STATUS,
+ val, !(val & GEN_PLD_R_EMPTY),
+ 1000, CMD_PKT_STATUS_TIMEOUT_US);
+ if (ret) {
+ dev_err(adp->drm.dev, "Read payload FIFO is empty\n");
+ return ret;
+ }
+
+ val = readl(adp->mipi + DSI_GEN_PLD_DATA);
+ for (j = 0; j < 4 && j + i < len; j++)
+ buf[i + j] = val >> (8 * j);
+ }
+
+ return ret;
+}
+
+static ssize_t adp_dsi_host_transfer(struct mipi_dsi_host *host,
+ const struct mipi_dsi_msg *msg)
+{
+ struct adp_drv_private *adp = mipi_to_adp(host);
+ struct mipi_dsi_packet packet;
+ int ret, nb_bytes;
+
+ ret = mipi_dsi_create_packet(&packet, msg);
+ if (ret) {
+ dev_err(adp->drm.dev, "failed to create packet: %d\n", ret);
+ return ret;
+ }
+
+ ret = adp_dsi_write(adp, &packet);
+ if (ret)
+ return ret;
+
+ if (msg->rx_buf && msg->rx_len) {
+ ret = adp_dsi_read(adp, msg);
+ if (ret)
+ return ret;
+ nb_bytes = msg->rx_len;
+ } else {
+ nb_bytes = packet.size;
+ }
+
+ return nb_bytes;
+}
+
+static int adp_dsi_host_attach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *dev)
+{
+ return 0;
+}
+
+static int adp_dsi_host_detach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *dev)
+{
+ return 0;
+}
+
+static const struct mipi_dsi_host_ops adp_dsi_host_ops = {
+ .transfer = adp_dsi_host_transfer,
+ .attach = adp_dsi_host_attach,
+ .detach = adp_dsi_host_detach,
+};
+
+static irqreturn_t adp_fe_irq(int irq, void *arg)
+{
+ struct adp_drv_private *adp = (struct adp_drv_private *)arg;
+ u32 int_status;
+ u32 int_ctl;
+
+ spin_lock(&adp->irq_lock);
+
+ int_status = readl(adp->fe + ADP_INT_STATUS);
+ if (int_status & ADP_INT_STATUS_VBLANK) {
+ drm_crtc_handle_vblank(&adp->crtc);
+ spin_lock(&adp->crtc.dev->event_lock);
+ if (adp->event) {
+ int_ctl = readl(adp->fe + ADP_CTRL);
+ if ((int_ctl & 0xF00) == 0x600) {
+ drm_crtc_send_vblank_event(&adp->crtc, adp->event);
+ adp->event = NULL;
+ drm_crtc_vblank_put(&adp->crtc);
+ }
+ }
+ spin_unlock(&adp->crtc.dev->event_lock);
+ }
+
+ writel(int_status, adp->fe + ADP_INT_STATUS);
+
+ spin_unlock(&adp->irq_lock);
+
+ return IRQ_HANDLED;
+}
+
+static int adp_probe(struct platform_device *pdev)
+{
+ struct adp_drv_private *adp;
+ int err;
+
+ adp = devm_drm_dev_alloc(&pdev->dev, &adp_driver, struct adp_drv_private, drm);
+ if (IS_ERR(adp))
+ return PTR_ERR(adp);
+
+ spin_lock_init(&adp->irq_lock);
+
+ dev_set_drvdata(&pdev->dev, &adp->drm);
+
+ err = adp_parse_of(pdev, adp);
+ if (err < 0)
+ return err;
+
+ adp->dsi.dev = &pdev->dev;
+ adp->dsi.ops = &adp_dsi_host_ops;
+ err = mipi_dsi_host_register(&adp->dsi);
+ if (err < 0)
+ return err;
+
+ adp_disable_vblank(adp);
+ writel(ADP_CTRL_FIFO_ON | ADP_CTRL_VBLANK_ON, adp->fe + ADP_CTRL);
+
+ err = adp_setup_mode_config(adp);
+ if (err < 0)
+ return err;
+
+ err = devm_request_irq(&pdev->dev, adp->fe_irq, adp_fe_irq, 0,
+ "adp-fe", adp);
+ if (err)
+ return err;
+
+ err = drm_dev_register(&adp->drm, 0);
+ if (err)
+ return err;
+ return 0;
+}
+
+static void adp_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct drm_device *drm = dev_get_drvdata(dev);
+ struct adp_drv_private *adp = to_adp(drm);
+
+ adp_disable_vblank(adp);
+ mipi_dsi_host_unregister(&adp->dsi);
+ drm_dev_unregister(drm);
+ dev_set_drvdata(dev, NULL);
+ drm_atomic_helper_shutdown(drm);
+}
+
+static const struct of_device_id adp_of_match[] = {
+ { .compatible = "apple,h7-display-pipe", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, adp_of_match);
+
+static struct platform_driver adp_platform_driver = {
+ .driver = {
+ .name = "adp",
+ .of_match_table = adp_of_match,
+ },
+ .probe = adp_probe,
+ .remove = adp_remove,
+};
+
+module_platform_driver(adp_platform_driver);
+
+MODULE_DESCRIPTION("Apple Display Pipe DRM driver");
+MODULE_LICENSE("GPL");
--
2.47.0
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