diff options
Diffstat (limited to 'drivers/gpu/drm/udl/udl_modeset.c')
| -rw-r--r-- | drivers/gpu/drm/udl/udl_modeset.c | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c new file mode 100644 index 000000000000..b3ecb3d12a1d --- /dev/null +++ b/drivers/gpu/drm/udl/udl_modeset.c @@ -0,0 +1,414 @@ +/* + * Copyright (C) 2012 Red Hat + * + * based in parts on udlfb.c: + * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it> + * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com> + * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com> + + * This file is subject to the terms and conditions of the GNU General Public + * License v2. See the file COPYING in the main directory of this archive for + * more details. + */ + +#include "drmP.h" +#include "drm_crtc.h" +#include "drm_crtc_helper.h" +#include "udl_drv.h" + +/* + * All DisplayLink bulk operations start with 0xAF, followed by specific code + * All operations are written to buffers which then later get sent to device + */ +static char *udl_set_register(char *buf, u8 reg, u8 val) +{ + *buf++ = 0xAF; + *buf++ = 0x20; + *buf++ = reg; + *buf++ = val; + return buf; +} + +static char *udl_vidreg_lock(char *buf) +{ + return udl_set_register(buf, 0xFF, 0x00); +} + +static char *udl_vidreg_unlock(char *buf) +{ + return udl_set_register(buf, 0xFF, 0xFF); +} + +/* + * On/Off for driving the DisplayLink framebuffer to the display + * 0x00 H and V sync on + * 0x01 H and V sync off (screen blank but powered) + * 0x07 DPMS powerdown (requires modeset to come back) + */ +static char *udl_enable_hvsync(char *buf, bool enable) +{ + if (enable) + return udl_set_register(buf, 0x1F, 0x00); + else + return udl_set_register(buf, 0x1F, 0x07); +} + +static char *udl_set_color_depth(char *buf, u8 selection) +{ + return udl_set_register(buf, 0x00, selection); +} + +static char *udl_set_base16bpp(char *wrptr, u32 base) +{ + /* the base pointer is 16 bits wide, 0x20 is hi byte. */ + wrptr = udl_set_register(wrptr, 0x20, base >> 16); + wrptr = udl_set_register(wrptr, 0x21, base >> 8); + return udl_set_register(wrptr, 0x22, base); +} + +/* + * 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 *wrptr, u32 base) +{ + wrptr = udl_set_register(wrptr, 0x26, base >> 16); + wrptr = udl_set_register(wrptr, 0x27, base >> 8); + return udl_set_register(wrptr, 0x28, base); +} + +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)); +} + +/* + * This takes a standard fbdev screeninfo struct and all of its monitor mode + * details and converts them into the DisplayLink equivalent register commands. + ERR(vreg(dev, 0x00, (color_depth == 16) ? 0 : 1)); + ERR(vreg_lfsr16(dev, 0x01, xDisplayStart)); + ERR(vreg_lfsr16(dev, 0x03, xDisplayEnd)); + ERR(vreg_lfsr16(dev, 0x05, yDisplayStart)); + ERR(vreg_lfsr16(dev, 0x07, yDisplayEnd)); + ERR(vreg_lfsr16(dev, 0x09, xEndCount)); + ERR(vreg_lfsr16(dev, 0x0B, hSyncStart)); + ERR(vreg_lfsr16(dev, 0x0D, hSyncEnd)); + ERR(vreg_big_endian(dev, 0x0F, hPixels)); + ERR(vreg_lfsr16(dev, 0x11, yEndCount)); + ERR(vreg_lfsr16(dev, 0x13, vSyncStart)); + ERR(vreg_lfsr16(dev, 0x15, vSyncEnd)); + ERR(vreg_big_endian(dev, 0x17, vPixels)); + ERR(vreg_little_endian(dev, 0x1B, pixelClock5KHz)); + + ERR(vreg(dev, 0x1F, 0)); + + ERR(vbuf(dev, WRITE_VIDREG_UNLOCK, DSIZEOF(WRITE_VIDREG_UNLOCK))); + */ +static char *udl_set_vid_cmds(char *wrptr, struct drm_display_mode *mode) +{ + u16 xds, yds; + u16 xde, yde; + u16 yec; + + /* x display start */ + xds = mode->crtc_htotal - mode->crtc_hsync_start; + wrptr = udl_set_register_lfsr16(wrptr, 0x01, xds); + /* x display end */ + xde = xds + mode->crtc_hdisplay; + wrptr = udl_set_register_lfsr16(wrptr, 0x03, xde); + + /* y display start */ + yds = mode->crtc_vtotal - mode->crtc_vsync_start; + wrptr = udl_set_register_lfsr16(wrptr, 0x05, yds); + /* y display end */ + yde = yds + mode->crtc_vdisplay; + wrptr = udl_set_register_lfsr16(wrptr, 0x07, yde); + + /* x end count is active + blanking - 1 */ + wrptr = udl_set_register_lfsr16(wrptr, 0x09, + mode->crtc_htotal - 1); + + /* libdlo hardcodes hsync start to 1 */ + wrptr = udl_set_register_lfsr16(wrptr, 0x0B, 1); + + /* hsync end is width of sync pulse + 1 */ + wrptr = udl_set_register_lfsr16(wrptr, 0x0D, + mode->crtc_hsync_end - mode->crtc_hsync_start + 1); + + /* hpixels is active pixels */ + wrptr = udl_set_register_16(wrptr, 0x0F, mode->hdisplay); + + /* yendcount is vertical active + vertical blanking */ + yec = mode->crtc_vtotal; + wrptr = udl_set_register_lfsr16(wrptr, 0x11, yec); + + /* libdlo hardcodes vsync start to 0 */ + wrptr = udl_set_register_lfsr16(wrptr, 0x13, 0); + + /* vsync end is width of vsync pulse */ + wrptr = udl_set_register_lfsr16(wrptr, 0x15, mode->crtc_vsync_end - mode->crtc_vsync_start); + + /* vpixels is active pixels */ + wrptr = udl_set_register_16(wrptr, 0x17, mode->crtc_vdisplay); + + wrptr = udl_set_register_16be(wrptr, 0x1B, + mode->clock / 5); + + return wrptr; +} + +static int udl_crtc_write_mode_to_hw(struct drm_crtc *crtc) +{ + struct drm_device *dev = crtc->dev; + struct udl_device *udl = dev->dev_private; + struct urb *urb; + char *buf; + int retval; + + urb = udl_get_urb(dev); + if (!urb) + return -ENOMEM; + + buf = (char *)urb->transfer_buffer; + + memcpy(buf, udl->mode_buf, udl->mode_buf_len); + retval = udl_submit_urb(dev, urb, udl->mode_buf_len); + DRM_INFO("write mode info %d\n", udl->mode_buf_len); + return retval; +} + + +static void udl_crtc_dpms(struct drm_crtc *crtc, int mode) +{ + struct drm_device *dev = crtc->dev; + struct udl_device *udl = dev->dev_private; + int retval; + + if (mode == DRM_MODE_DPMS_OFF) { + char *buf; + struct urb *urb; + urb = udl_get_urb(dev); + if (!urb) + return; + + buf = (char *)urb->transfer_buffer; + buf = udl_vidreg_lock(buf); + buf = udl_enable_hvsync(buf, false); + buf = udl_vidreg_unlock(buf); + + retval = udl_submit_urb(dev, urb, buf - (char *) + urb->transfer_buffer); + } else { + if (udl->mode_buf_len == 0) { + DRM_ERROR("Trying to enable DPMS with no mode\n"); + return; + } + udl_crtc_write_mode_to_hw(crtc); + } + +} + +static bool udl_crtc_mode_fixup(struct drm_crtc *crtc, + struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode) + +{ + return true; +} + +#if 0 +static int +udl_pipe_set_base_atomic(struct drm_crtc *crtc, struct drm_framebuffer *fb, + int x, int y, enum mode_set_atomic state) +{ + return 0; +} + +static int +udl_pipe_set_base(struct drm_crtc *crtc, int x, int y, + struct drm_framebuffer *old_fb) +{ + return 0; +} +#endif + +static int udl_crtc_mode_set(struct drm_crtc *crtc, + struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode, + int x, int y, + struct drm_framebuffer *old_fb) + +{ + struct drm_device *dev = crtc->dev; + struct udl_framebuffer *ufb = to_udl_fb(crtc->fb); + struct udl_device *udl = dev->dev_private; + char *buf; + char *wrptr; + int color_depth = 0; + + buf = (char *)udl->mode_buf; + + /* for now we just clip 24 -> 16 - if we fix that fix this */ + /*if (crtc->fb->bits_per_pixel != 16) + color_depth = 1; */ + + /* This first section has to do with setting the base address on the + * controller * associated with the display. There are 2 base + * pointers, currently, we only * use the 16 bpp segment. + */ + wrptr = udl_vidreg_lock(buf); + wrptr = udl_set_color_depth(wrptr, color_depth); + /* set base for 16bpp segment to 0 */ + wrptr = udl_set_base16bpp(wrptr, 0); + /* set base for 8bpp segment to end of fb */ + wrptr = udl_set_base8bpp(wrptr, 2 * mode->vdisplay * mode->hdisplay); + + wrptr = udl_set_vid_cmds(wrptr, adjusted_mode); + wrptr = udl_enable_hvsync(wrptr, true); + wrptr = udl_vidreg_unlock(wrptr); + + ufb->active_16 = true; + if (old_fb) { + struct udl_framebuffer *uold_fb = to_udl_fb(old_fb); + uold_fb->active_16 = false; + } + udl->mode_buf_len = wrptr - buf; + + /* damage all of it */ + udl_handle_damage(ufb, 0, 0, ufb->base.width, ufb->base.height); + return 0; +} + + +static void udl_crtc_disable(struct drm_crtc *crtc) +{ + + +} + +static void udl_crtc_destroy(struct drm_crtc *crtc) +{ + drm_crtc_cleanup(crtc); + kfree(crtc); +} + +static void udl_load_lut(struct drm_crtc *crtc) +{ +} + +static void udl_crtc_prepare(struct drm_crtc *crtc) +{ +} + +static void udl_crtc_commit(struct drm_crtc *crtc) +{ + udl_crtc_dpms(crtc, DRM_MODE_DPMS_ON); +} + +static struct drm_crtc_helper_funcs udl_helper_funcs = { + .dpms = udl_crtc_dpms, + .mode_fixup = udl_crtc_mode_fixup, + .mode_set = udl_crtc_mode_set, + .prepare = udl_crtc_prepare, + .commit = udl_crtc_commit, + .disable = udl_crtc_disable, + .load_lut = udl_load_lut, +}; + +static const struct drm_crtc_funcs udl_crtc_funcs = { + .set_config = drm_crtc_helper_set_config, + .destroy = udl_crtc_destroy, +}; + +int udl_crtc_init(struct drm_device *dev) +{ + struct drm_crtc *crtc; + + crtc = kzalloc(sizeof(struct drm_crtc) + sizeof(struct drm_connector *), GFP_KERNEL); + if (crtc == NULL) + return -ENOMEM; + + drm_crtc_init(dev, crtc, &udl_crtc_funcs); + drm_crtc_helper_add(crtc, &udl_helper_funcs); + + return 0; +} + +static const struct drm_mode_config_funcs udl_mode_funcs = { + .fb_create = udl_fb_user_fb_create, + .output_poll_changed = NULL, +}; + +int udl_modeset_init(struct drm_device *dev) +{ + struct drm_encoder *encoder; + drm_mode_config_init(dev); + + 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.prefer_shadow = 0; + dev->mode_config.preferred_depth = 24; + + dev->mode_config.funcs = (void *)&udl_mode_funcs; + + drm_mode_create_dirty_info_property(dev); + + udl_crtc_init(dev); + + encoder = udl_encoder_init(dev); + + udl_connector_init(dev, encoder); + + return 0; +} + +void udl_modeset_cleanup(struct drm_device *dev) +{ + drm_mode_config_cleanup(dev); +} |