udlfb: add more comprehensive support for DPMS FB_BLANK_* modes
Fixes earlier problems where monitor would not return from blank Test with any DisplayLink-based USB 2.0 graphics adapter sudo nano /sys/class/graphics/fb?/blank and write out single digit FB_BLANK_* code from include/linux/fb.h Supports on (0), blank (1), suspend (2,3), powerdown (4) Signed-off-by: Bernie Thompson <bernie@plugable.com> Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
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@ -94,17 +94,39 @@ static char *dlfb_vidreg_unlock(char *buf)
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}
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}
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/*
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/*
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* On/Off for driving the DisplayLink framebuffer to the display
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* Map FB_BLANK_* to DisplayLink register
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* 0x00 H and V sync on
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* DLReg FB_BLANK_*
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* 0x01 H and V sync off (screen blank but powered)
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* ----- -----------------------------
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* 0x07 DPMS powerdown (requires modeset to come back)
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* 0x00 FB_BLANK_UNBLANK (0)
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* 0x01 FB_BLANK (1)
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* 0x03 FB_BLANK_VSYNC_SUSPEND (2)
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* 0x05 FB_BLANK_HSYNC_SUSPEND (3)
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* 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back
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*/
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*/
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static char *dlfb_enable_hvsync(char *buf, bool enable)
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static char *dlfb_blanking(char *buf, int fb_blank)
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{
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{
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if (enable)
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u8 reg;
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return dlfb_set_register(buf, 0x1F, 0x00);
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else
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switch (fb_blank) {
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return dlfb_set_register(buf, 0x1F, 0x07);
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case FB_BLANK_POWERDOWN:
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reg = 0x07;
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break;
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case FB_BLANK_HSYNC_SUSPEND:
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reg = 0x05;
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break;
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case FB_BLANK_VSYNC_SUSPEND:
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reg = 0x03;
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break;
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case FB_BLANK_NORMAL:
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reg = 0x01;
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break;
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default:
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reg = 0x00;
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}
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buf = dlfb_set_register(buf, 0x1F, reg);
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return buf;
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}
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}
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static char *dlfb_set_color_depth(char *buf, u8 selection)
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static char *dlfb_set_color_depth(char *buf, u8 selection)
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@ -272,13 +294,15 @@ static int dlfb_set_video_mode(struct dlfb_data *dev,
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wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len);
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wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len);
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wrptr = dlfb_set_vid_cmds(wrptr, var);
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wrptr = dlfb_set_vid_cmds(wrptr, var);
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wrptr = dlfb_enable_hvsync(wrptr, true);
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wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK);
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wrptr = dlfb_vidreg_unlock(wrptr);
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wrptr = dlfb_vidreg_unlock(wrptr);
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writesize = wrptr - buf;
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writesize = wrptr - buf;
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retval = dlfb_submit_urb(dev, urb, writesize);
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retval = dlfb_submit_urb(dev, urb, writesize);
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dev->blank_mode = FB_BLANK_UNBLANK;
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return retval;
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return retval;
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}
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}
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@ -1039,32 +1063,57 @@ static int dlfb_ops_set_par(struct fb_info *info)
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return result;
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return result;
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}
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}
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/* To fonzi the jukebox (e.g. make blanking changes take effect) */
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static char *dlfb_dummy_render(char *buf)
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{
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*buf++ = 0xAF;
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*buf++ = 0x6A; /* copy */
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*buf++ = 0x00; /* from address*/
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*buf++ = 0x00;
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*buf++ = 0x00;
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*buf++ = 0x01; /* one pixel */
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*buf++ = 0x00; /* to address */
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*buf++ = 0x00;
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*buf++ = 0x00;
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return buf;
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}
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/*
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/*
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* In order to come back from full DPMS off, we need to set the mode again
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* In order to come back from full DPMS off, we need to set the mode again
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*/
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*/
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static int dlfb_ops_blank(int blank_mode, struct fb_info *info)
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static int dlfb_ops_blank(int blank_mode, struct fb_info *info)
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{
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{
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struct dlfb_data *dev = info->par;
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struct dlfb_data *dev = info->par;
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char *bufptr;
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struct urb *urb;
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if (blank_mode != FB_BLANK_UNBLANK) {
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pr_info("/dev/fb%d FB_BLANK mode %d --> %d\n",
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char *bufptr;
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info->node, dev->blank_mode, blank_mode);
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struct urb *urb;
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urb = dlfb_get_urb(dev);
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if ((dev->blank_mode == FB_BLANK_POWERDOWN) &&
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if (!urb)
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(blank_mode != FB_BLANK_POWERDOWN)) {
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return 0;
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bufptr = (char *) urb->transfer_buffer;
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/* returning from powerdown requires a fresh modeset */
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bufptr = dlfb_vidreg_lock(bufptr);
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bufptr = dlfb_enable_hvsync(bufptr, false);
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bufptr = dlfb_vidreg_unlock(bufptr);
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dlfb_submit_urb(dev, urb, bufptr -
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(char *) urb->transfer_buffer);
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} else {
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dlfb_set_video_mode(dev, &info->var);
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dlfb_set_video_mode(dev, &info->var);
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}
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}
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urb = dlfb_get_urb(dev);
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if (!urb)
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return 0;
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bufptr = (char *) urb->transfer_buffer;
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bufptr = dlfb_vidreg_lock(bufptr);
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bufptr = dlfb_blanking(bufptr, blank_mode);
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bufptr = dlfb_vidreg_unlock(bufptr);
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/* seems like a render op is needed to have blank change take effect */
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bufptr = dlfb_dummy_render(bufptr);
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dlfb_submit_urb(dev, urb, bufptr -
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(char *) urb->transfer_buffer);
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dev->blank_mode = blank_mode;
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return 0;
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return 0;
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}
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}
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@ -50,6 +50,7 @@ struct dlfb_data {
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int base16;
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int base16;
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int base8;
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int base8;
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u32 pseudo_palette[256];
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u32 pseudo_palette[256];
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int blank_mode; /*one of FB_BLANK_ */
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/* blit-only rendering path metrics, exposed through sysfs */
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/* blit-only rendering path metrics, exposed through sysfs */
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atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
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atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
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atomic_t bytes_identical; /* saved effort with backbuffer comparison */
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atomic_t bytes_identical; /* saved effort with backbuffer comparison */
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