// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Red Hat
*
* based in parts on udlfb.c:
* Copyright (C) 2009 Roberto De Ioris <[email protected]>
* Copyright (C) 2009 Jaya Kumar <[email protected]>
* Copyright (C) 2009 Bernie Thompson <[email protected]>
*/
#include <linux/bitfield.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include "udl_drv.h"
#include "udl_edid.h"
#include "udl_proto.h"
/*
* All DisplayLink bulk operations start with 0xaf (UDL_MSG_BULK), followed by
* a specific command code. All operations are written to a command buffer, which
* the driver sends to the device.
*/
static char *udl_set_register(char *buf, u8 reg, u8 val)
{
*buf++ = UDL_MSG_BULK;
*buf++ = UDL_CMD_WRITEREG;
*buf++ = reg;
*buf++ = val;
return buf;
}
static char *udl_vidreg_lock(char *buf)
{
return udl_set_register(buf, UDL_REG_VIDREG, UDL_VIDREG_LOCK);
}
static char *udl_vidreg_unlock(char *buf)
{
return udl_set_register(buf, UDL_REG_VIDREG, UDL_VIDREG_UNLOCK);
}
static char *udl_set_blank_mode(char *buf, u8 mode)
{
return udl_set_register(buf, UDL_REG_BLANKMODE, mode);
}
static char *udl_set_color_depth(char *buf, u8 selection)
{
return udl_set_register(buf, UDL_REG_COLORDEPTH, selection);
}
static char *udl_set_base16bpp(char *buf, u32 base)
{
/* the base pointer is 24 bits wide, 0x20 is hi byte. */
u8 reg20 = FIELD_GET(UDL_BASE_ADDR2_MASK, base);
u8 reg21 = FIELD_GET(UDL_BASE_ADDR1_MASK, base);
u8 reg22 = FIELD_GET(UDL_BASE_ADDR0_MASK, base);
buf = udl_set_register(buf, UDL_REG_BASE16BPP_ADDR2, reg20);
buf = udl_set_register(buf, UDL_REG_BASE16BPP_ADDR1, reg21);
buf = udl_set_register(buf, UDL_REG_BASE16BPP_ADDR0, reg22);
return buf;
}
/*
* DisplayLink HW has separate 16bpp and 8bpp framebuffers.
* In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
*/
static char *udl_set_base8bpp(char *buf, u32 base)
{
/* the base pointer is 24 bits wide, 0x26 is hi byte. */
u8 reg26 = FIELD_GET(UDL_BASE_ADDR2_MASK, base);
u8 reg27 = FIELD_GET(UDL_BASE_ADDR1_MASK, base);
u8 reg28 = FIELD_GET(UDL_BASE_ADDR0_MASK, base);
buf = udl_set_register(buf, UDL_REG_BASE8BPP_ADDR2, reg26);
buf = udl_set_register(buf, UDL_REG_BASE8BPP_ADDR1, reg27);
buf = udl_set_register(buf, UDL_REG_BASE8BPP_ADDR0, reg28);
return buf;
}
static char *udl_set_register_16(char *wrptr, u8 reg, u16 value)
{
wrptr = udl_set_register(wrptr, reg, value >> 8);
return udl_set_register(wrptr, reg+1, value);
}
/*
* This is kind of weird because the controller takes some
* register values in a different byte order than other registers.
*/
static char *udl_set_register_16be(char *wrptr, u8 reg, u16 value)
{
wrptr = udl_set_register(wrptr, reg, value);
return udl_set_register(wrptr, reg+1, value >> 8);
}
/*
* LFSR is linear feedback shift register. The reason we have this is
* because the display controller needs to minimize the clock depth of
* various counters used in the display path. So this code reverses the
* provided value into the lfsr16 value by counting backwards to get
* the value that needs to be set in the hardware comparator to get the
* same actual count. This makes sense once you read above a couple of
* times and think about it from a hardware perspective.
*/
static u16 udl_lfsr16(u16 actual_count)
{
u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
while (actual_count--) {
lv = ((lv << 1) |
(((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))
& 0xFFFF;
}
return (u16) lv;
}
/*
* This does LFSR conversion on the value that is to be written.
* See LFSR explanation above for more detail.
*/
static char *udl_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
{
return udl_set_register_16(wrptr, reg, udl_lfsr16(value));
}
/*
* Takes a DRM display mode and converts it into the DisplayLink
* equivalent register commands.
*/
static char *udl_set_display_mode(char *buf, struct drm_display_mode *mode)
{
u16 reg01 = mode->crtc_htotal - mode->crtc_hsync_start;
u16 reg03 = reg01 + mode->crtc_hdisplay;
u16 reg05 = mode->crtc_vtotal - mode->crtc_vsync_start;
u16 reg07 = reg05 + mode->crtc_vdisplay;
u16 reg09 = mode->crtc_htotal - 1;
u16 reg0b = 1; /* libdlo hardcodes hsync start to 1 */
u16 reg0d = mode->crtc_hsync_end - mode->crtc_hsync_start + 1;
u16 reg0f = mode->hdisplay;
u16 reg11 = mode->crtc_vtotal;
u16 reg13 = 0; /* libdlo hardcodes vsync start to 0 */
u16 reg15 = mode->crtc_vsync_end - mode->crtc_vsync_start;
u16 reg17 = mode->crtc_vdisplay;
u16 reg1b = mode->clock / 5;
buf = udl_set_register_lfsr16(buf, UDL_REG_XDISPLAYSTART, reg01);
buf = udl_set_register_lfsr16(buf, UDL_REG_XDISPLAYEND, reg03);
buf = udl_set_register_lfsr16(buf, UDL_REG_YDISPLAYSTART, reg05);
buf = udl_set_register_lfsr16(buf, UDL_REG_YDISPLAYEND, reg07);
buf = udl_set_register_lfsr16(buf, UDL_REG_XENDCOUNT, reg09);
buf = udl_set_register_lfsr16(buf, UDL_REG_HSYNCSTART, reg0b);
buf = udl_set_register_lfsr16(buf, UDL_REG_HSYNCEND, reg0d);
buf = udl_set_register_16(buf, UDL_REG_HPIXELS, reg0f);
buf = udl_set_register_lfsr16(buf, UDL_REG_YENDCOUNT, reg11);
buf = udl_set_register_lfsr16(buf, UDL_REG_VSYNCSTART, reg13);
buf = udl_set_register_lfsr16(buf, UDL_REG_VSYNCEND, reg15);
buf = udl_set_register_16(buf, UDL_REG_VPIXELS, reg17);
buf = udl_set_register_16be(buf, UDL_REG_PIXELCLOCK5KHZ, reg1b);
return buf;
}
static char *udl_dummy_render(char *wrptr)
{
*wrptr++ = UDL_MSG_BULK;
*wrptr++ = UDL_CMD_WRITECOPY16;
*wrptr++ = 0x00; /* from addr */
*wrptr++ = 0x00;
*wrptr++ = 0x00;
*wrptr++ = 0x01; /* one pixel */
*wrptr++ = 0x00; /* to address */
*wrptr++ = 0x00;
*wrptr++ = 0x00;
return wrptr;
}
static long udl_log_cpp(unsigned int cpp)
{
if (WARN_ON(!is_power_of_2(cpp)))
return -EINVAL;
return __ffs(cpp);
}
static int udl_handle_damage(struct drm_framebuffer *fb,
const struct iosys_map *map,
const struct drm_rect *clip)
{
struct drm_device *dev = fb->dev;
void *vaddr = map->vaddr; /* TODO: Use mapping abstraction properly */
int i, ret;
char *cmd;
struct urb *urb;
int log_bpp;
ret = udl_log_cpp(fb->format->cpp[0]);
if (ret < 0)
return ret;
log_bpp = ret;
urb = udl_get_urb(dev);
if (!urb)
return -ENOMEM;
cmd = urb->transfer_buffer;
for (i = clip->y1; i < clip->y2; i++) {
const int line_offset = fb->pitches[0] * i;
const int byte_offset = line_offset + (clip->x1 << log_bpp);
const int dev_byte_offset = (fb->width * i + clip->x1) << log_bpp;
const int byte_width = drm_rect_width(clip) << log_bpp;
ret = udl_render_hline(dev, log_bpp, &urb, (char *)vaddr,
&cmd, byte_offset, dev_byte_offset,
byte_width);
if (ret)
return ret;
}
if (cmd > (char *)urb->transfer_buffer) {
/* Send partial buffer remaining before exiting */
int len;
if (cmd < (char *)urb->transfer_buffer + urb->transfer_buffer_length)
*cmd++ = UDL_MSG_BULK;
len = cmd - (char *)urb->transfer_buffer;
ret = udl_submit_urb(dev, urb, len);
} else {
udl_urb_completion(urb);
}
return 0;
}
/*
* Primary plane
*/
static const uint32_t udl_primary_plane_formats[] = {
DRM_FORMAT_RGB565,
DRM_FORMAT_XRGB8888,
};
static const uint64_t udl_primary_plane_fmtmods[] = {
DRM_FORMAT_MOD_LINEAR,
DRM_FORMAT_MOD_INVALID
};
static int udl_primary_plane_helper_atomic_check(struct drm_plane *plane,
struct drm_atomic_state *state)
{
struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
struct drm_crtc *new_crtc = new_plane_state->crtc;
struct drm_crtc_state *new_crtc_state = NULL;
if (new_crtc)
new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
DRM_PLANE_NO_SCALING,
DRM_PLANE_NO_SCALING,
false, false);
}
static void udl_primary_plane_helper_atomic_update(struct drm_plane *plane,
struct drm_atomic_state *state)
{
struct drm_device *dev = plane->dev;
struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
struct drm_framebuffer *fb = plane_state->fb;
struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
struct drm_atomic_helper_damage_iter iter;
struct drm_rect damage;
int ret, idx;
if (!fb)
return; /* no framebuffer; plane is disabled */
ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
if (ret)
return;
if (!drm_dev_enter(dev, &idx))
goto out_drm_gem_fb_end_cpu_access;
drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
drm_atomic_for_each_plane_damage(&iter, &damage) {
udl_handle_damage(fb, &shadow_plane_state->data[0], &damage);
}
drm_dev_exit(idx);
out_drm_gem_fb_end_cpu_access:
drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
}
static const struct drm_plane_helper_funcs udl_primary_plane_helper_funcs = {
DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
.atomic_check = udl_primary_plane_helper_atomic_check,
.atomic_update = udl_primary_plane_helper_atomic_update,
};
static const struct drm_plane_funcs udl_primary_plane_funcs = {
.update_plane = drm_atomic_helper_update_plane,
.disable_plane = drm_atomic_helper_disable_plane,
.destroy = drm_plane_cleanup,
DRM_GEM_SHADOW_PLANE_FUNCS,
};
/*
* CRTC
*/
static void udl_crtc_helper_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_state *state)
{
struct drm_device *dev = crtc->dev;
struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
struct drm_display_mode *mode = &crtc_state->mode;
struct urb *urb;
char *buf;
int idx;
if (!drm_dev_enter(dev, &idx))
return;
urb = udl_get_urb(dev);
if (!urb)
goto out;
buf = (char *)urb->transfer_buffer;
buf = udl_vidreg_lock(buf);
buf = udl_set_color_depth(buf, UDL_COLORDEPTH_16BPP);
/* set base for 16bpp segment to 0 */
buf = udl_set_base16bpp(buf, 0);
/* set base for 8bpp segment to end of fb */
buf = udl_set_base8bpp(buf, 2 * mode->vdisplay * mode->hdisplay);
buf = udl_set_display_mode(buf, mode);
buf = udl_set_blank_mode(buf, UDL_BLANKMODE_ON);
buf = udl_vidreg_unlock(buf);
buf = udl_dummy_render(buf);
udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer);
out:
drm_dev_exit(idx);
}
static void udl_crtc_helper_atomic_disable(struct drm_crtc *crtc, struct drm_atomic_state *state)
{
struct drm_device *dev = crtc->dev;
struct urb *urb;
char *buf;
int idx;
if (!drm_dev_enter(dev, &idx))
return;
urb = udl_get_urb(dev);
if (!urb)
goto out;
buf = (char *)urb->transfer_buffer;
buf = udl_vidreg_lock(buf);
buf = udl_set_blank_mode(buf, UDL_BLANKMODE_POWERDOWN);
buf = udl_vidreg_unlock(buf);
buf = udl_dummy_render(buf);
udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer);
out:
drm_dev_exit(idx);
}
static const struct drm_crtc_helper_funcs udl_crtc_helper_funcs = {
.atomic_check = drm_crtc_helper_atomic_check,
.atomic_enable = udl_crtc_helper_atomic_enable,
.atomic_disable = udl_crtc_helper_atomic_disable,
};
static const struct drm_crtc_funcs udl_crtc_funcs = {
.reset = drm_atomic_helper_crtc_reset,
.destroy = drm_crtc_cleanup,
.set_config = drm_atomic_helper_set_config,
.page_flip = drm_atomic_helper_page_flip,
.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
};
/*
* Encoder
*/
static const struct drm_encoder_funcs udl_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
/*
* Connector
*/
static int udl_connector_helper_get_modes(struct drm_connector *connector)
{
const struct drm_edid *drm_edid;
int count;
drm_edid = udl_edid_read(connector);
drm_edid_connector_update(connector, drm_edid);
count = drm_edid_connector_add_modes(connector);
drm_edid_free(drm_edid);
return count;
}
static int udl_connector_helper_detect_ctx(struct drm_connector *connector,
struct drm_modeset_acquire_ctx *ctx,
bool force)
{
struct udl_device *udl = to_udl(connector->dev);
if (udl_probe_edid(udl))
return connector_status_connected;
return connector_status_disconnected;
}
static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
.get_modes = udl_connector_helper_get_modes,
.detect_ctx = udl_connector_helper_detect_ctx,
};
static const struct drm_connector_funcs udl_connector_funcs = {
.reset = drm_atomic_helper_connector_reset,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
/*
* Modesetting
*/
static enum drm_mode_status udl_mode_config_mode_valid(struct drm_device *dev,
const struct drm_display_mode *mode)
{
struct udl_device *udl = to_udl(dev);
if (udl->sku_pixel_limit) {
if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
return MODE_MEM;
}
return MODE_OK;
}
static const struct drm_mode_config_funcs udl_mode_config_funcs = {
.fb_create = drm_gem_fb_create_with_dirty,
.mode_valid = udl_mode_config_mode_valid,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
int udl_modeset_init(struct drm_device *dev)
{
struct udl_device *udl = to_udl(dev);
struct drm_plane *primary_plane;
struct drm_crtc *crtc;
struct drm_encoder *encoder;
struct drm_connector *connector;
int ret;
ret = drmm_mode_config_init(dev);
if (ret)
return ret;
dev->mode_config.min_width = 640;
dev->mode_config.min_height = 480;
dev->mode_config.max_width = 2048;
dev->mode_config.max_height = 2048;
dev->mode_config.preferred_depth = 16;
dev->mode_config.funcs = &udl_mode_config_funcs;
primary_plane = &udl->primary_plane;
ret = drm_universal_plane_init(dev, primary_plane, 0,
&udl_primary_plane_funcs,
udl_primary_plane_formats,
ARRAY_SIZE(udl_primary_plane_formats),
udl_primary_plane_fmtmods,
DRM_PLANE_TYPE_PRIMARY, NULL);
if (ret)
return ret;
drm_plane_helper_add(primary_plane, &udl_primary_plane_helper_funcs);
drm_plane_enable_fb_damage_clips(primary_plane);
crtc = &udl->crtc;
ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
&udl_crtc_funcs, NULL);
if (ret)
return ret;
drm_crtc_helper_add(crtc, &udl_crtc_helper_funcs);
encoder = &udl->encoder;
ret = drm_encoder_init(dev, encoder, &udl_encoder_funcs, DRM_MODE_ENCODER_DAC, NULL);
if (ret)
return ret;
encoder->possible_crtcs = drm_crtc_mask(crtc);
connector = &udl->connector;
ret = drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_VGA);
if (ret)
return ret;
drm_connector_helper_add(connector, &udl_connector_helper_funcs);
connector->polled = DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT;
ret = drm_connector_attach_encoder(connector, encoder);
if (ret)
return ret;
drm_mode_config_reset(dev);
return 0;
}
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