[PATCH v2 00/47] tty: vt: cleanup and documentation

[PATCH v2 00/47] tty: vt: cleanup and documentation

[Jiri Slaby (SUSE)]

Push the console code (vt.c, vt.h, console.h, ...) into a bit more
maintainable state. Especially all around consw structure and document
it.

CSI parser is also a bit cleaned up. More to follow some time in the
next round.

[v2] See respective patches for changes. The major changes:
 * vesa.h introduced
 * parameters of csi*() simplified

Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: linux-fbdev@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Cc: Martin Hostettler <textshell@uchuujin.de>
Cc: Thomas Zimmermann <tzimmermann@suse.de>

Jiri Slaby (SUSE) (47):

  vgacon: inline vc_scrolldelta_helper() into vgacon_scrolldelta()
  fbcon: make display_desc a static array in fbcon_startup()
  tty: vt: fix 20 vs 0x20 typo in EScsiignore
  tty: vt: expect valid vc when in tty ops
  tty: vt: pass proper pointers from tioclinux()
  tty: vt: push console lock from tioclinux() down to 2 functions
  tty: vt: pass vc_resize_user as a parameter
  tty: vt: make vc_is_sel()'s vc const
  tty: vt: define an enum for CSI+m codes
  tty: vt: use case ranges for CSI+m fg/bg colors
  tty: vt: define an enum for CSI+J codes
  tty: vt: reflow csi_J()
  use clamp() for counts in csi_?() handlers
  don't pass vc->vc_par[0] to csi_?() handlers
  tty: vt: define an enum for CSI+K codes
  tty: vt: reflow csi_K()
  tty: vt: define an enum for ascii characters
  tty: vt: remove extern from functions in selection.h
  tty: vt: make consw::con_debug_*() return void
  tty: vt: make init parameter of consw::con_init() a bool
  tty: vt: sanitize arguments of consw::con_clear()
  tty: vt: remove checks for count in consw::con_clear() implementations
  tty: vt: add con_putc() helper
  tty: vt: eliminate unneeded consw::con_putc() implementations
  tty: vt: sanitize consw::con_putc() parameters
  tty: vt: sanitize consw::con_putcs() parameters
  consoles: use if instead of switch-case in consw::con_cursor()
  fbdev/core: simplify cursor_state setting in fbcon_ops::cursor()
  tty: vt: remove CM_* constants
  tty: vt: make consw::con_switch() return a bool
  tty: vt: stop using -1 for blank mode in consw::con_blank()
  tty: vt: define a common enum for VESA blanking constants
  tty: vt: use VESA blanking constants
  tty: vt: use enum constants for VESA blanking modes
  tty: vt: make types around consw::con_blank() bool
  tty: vt: make font of consw::con_font_set() const
  tty: vt: make consw::con_font_default()'s name const
  tty: vt: change consw::con_set_origin() return type
  fbcon: remove consw::con_screen_pos()
  tty: vt: remove consw::con_screen_pos()
  tty: vt: make types of screenpos() more consistent
  fbcon: remove fbcon_getxy()
  tty: vt: remove consw::con_getxy()
  tty: vt: remove unused consw::con_flush_scrollback()
  tty: vt: document the rest of struct consw
  tty: vt: fix up kernel-doc
  Documentation: add console.rst

 Documentation/driver-api/tty/console.rst |  45 ++
 Documentation/driver-api/tty/index.rst   |   1 +
 drivers/tty/vt/selection.c               |  43 +-
 drivers/tty/vt/vt.c                      | 645 +++++++++++------------
 drivers/tty/vt/vt_ioctl.c                |   6 +-
 drivers/video/console/dummycon.c         |  38 +-
 drivers/video/console/mdacon.c           |  43 +-
 drivers/video/console/newport_con.c      |  69 +--
 drivers/video/console/sticon.c           |  79 ++-
 drivers/video/console/vgacon.c           | 152 +++---
 drivers/video/fbdev/core/bitblit.c       |  13 +-
 drivers/video/fbdev/core/fbcon.c         | 123 ++---
 drivers/video/fbdev/core/fbcon.h         |   4 +-
 drivers/video/fbdev/core/fbcon_ccw.c     |  13 +-
 drivers/video/fbdev/core/fbcon_cw.c      |  13 +-
 drivers/video/fbdev/core/fbcon_ud.c      |  13 +-
 drivers/video/fbdev/core/tileblit.c      |   4 +-
 include/linux/console.h                  | 124 +++--
 include/linux/console_struct.h           |   1 -
 include/linux/selection.h                |  56 +-
 include/linux/vt_kern.h                  |  12 +-
 include/uapi/linux/fb.h                  |   8 +-
 include/uapi/linux/vesa.h                |  18 +
 23 files changed, 755 insertions(+), 768 deletions(-)
 create mode 100644 Documentation/driver-api/tty/console.rst
 create mode 100644 include/uapi/linux/vesa.h

-- 
2.43.0

[PATCH v2 20/47] tty: vt: make init parameter of consw::con_init() a bool

[Jiri Slaby (SUSE)]

The 'init' parameter of consw::con_init() is true for the first call of
the hook on a particular console. So make the parameter a bool.

And document the hook.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---

Notes:
    [v2] fix up the comment (Geert)

 drivers/tty/vt/vt.c                 | 8 ++++----
 drivers/video/console/dummycon.c    | 2 +-
 drivers/video/console/mdacon.c      | 2 +-
 drivers/video/console/newport_con.c | 2 +-
 drivers/video/console/sticon.c      | 2 +-
 drivers/video/console/vgacon.c      | 4 ++--
 drivers/video/fbdev/core/fbcon.c    | 2 +-
 include/linux/console.h             | 4 +++-
 8 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index bbfda0d33ca1..fcb41c8724f3 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -999,7 +999,7 @@ int vc_cons_allocated(unsigned int i)
 	return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 }
 
-static void visual_init(struct vc_data *vc, int num, int init)
+static void visual_init(struct vc_data *vc, int num, bool init)
 {
 	/* ++Geert: vc->vc_sw->con_init determines console size */
 	if (vc->vc_sw)
@@ -1083,7 +1083,7 @@ int vc_allocate(unsigned int currcons)	/* return 0 on success */
 	vc->port.ops = &vc_port_ops;
 	INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 
-	visual_init(vc, currcons, 1);
+	visual_init(vc, currcons, true);
 
 	if (!*vc->uni_pagedict_loc)
 		con_set_default_unimap(vc);
@@ -3513,7 +3513,7 @@ static int __init con_init(void)
 		vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
 		INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 		tty_port_init(&vc->port);
-		visual_init(vc, currcons, 1);
+		visual_init(vc, currcons, true);
 		/* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
 		vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
 		vc_init(vc, currcons || !vc->vc_sw->con_save_screen);
@@ -3682,7 +3682,7 @@ static int do_bind_con_driver(const struct consw *csw, int first, int last,
 		old_was_color = vc->vc_can_do_color;
 		vc->vc_sw->con_deinit(vc);
 		vc->vc_origin = (unsigned long)vc->vc_screenbuf;
-		visual_init(vc, i, 0);
+		visual_init(vc, i, false);
 		set_origin(vc);
 		update_attr(vc);
 
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
index 14af5d9e13b0..f2cef9d9a4b5 100644
--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -98,7 +98,7 @@ static const char *dummycon_startup(void)
     return "dummy device";
 }
 
-static void dummycon_init(struct vc_data *vc, int init)
+static void dummycon_init(struct vc_data *vc, bool init)
 {
     vc->vc_can_do_color = 1;
     if (init) {
diff --git a/drivers/video/console/mdacon.c b/drivers/video/console/mdacon.c
index ef29b321967f..c5b255c96879 100644
--- a/drivers/video/console/mdacon.c
+++ b/drivers/video/console/mdacon.c
@@ -352,7 +352,7 @@ static const char *mdacon_startup(void)
 	return "MDA-2";
 }
 
-static void mdacon_init(struct vc_data *c, int init)
+static void mdacon_init(struct vc_data *c, bool init)
 {
 	c->vc_complement_mask = 0x0800;	 /* reverse video */
 	c->vc_display_fg = &mda_display_fg;
diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index e8e4f82cd4a1..12c64ef47087 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -324,7 +324,7 @@ static const char *newport_startup(void)
 	return NULL;
 }
 
-static void newport_init(struct vc_data *vc, int init)
+static void newport_init(struct vc_data *vc, bool init)
 {
 	int cols, rows;
 
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index 992a4fa431aa..0bfeabc3f7c7 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -273,7 +273,7 @@ static int sticon_font_set(struct vc_data *vc, struct console_font *font,
 	return sticon_set_font(vc, font, vpitch);
 }
 
-static void sticon_init(struct vc_data *c, int init)
+static void sticon_init(struct vc_data *c, bool init)
 {
     struct sti_struct *sti = sticon_sti;
     int vc_cols, vc_rows;
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index 0c76e2817b49..5d523753def8 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -367,7 +367,7 @@ static const char *vgacon_startup(void)
 	return display_desc;
 }
 
-static void vgacon_init(struct vc_data *c, int init)
+static void vgacon_init(struct vc_data *c, bool init)
 {
 	struct uni_pagedict *p;
 
@@ -384,7 +384,7 @@ static void vgacon_init(struct vc_data *c, int init)
 	c->vc_scan_lines = vga_scan_lines;
 	c->vc_font.height = c->vc_cell_height = vga_video_font_height;
 
-	/* set dimensions manually if init != 0 since vc_resize() will fail */
+	/* set dimensions manually if init is true since vc_resize() will fail */
 	if (init) {
 		c->vc_cols = vga_video_num_columns;
 		c->vc_rows = vga_video_num_lines;
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index d3fb98084eda..939c5d893dfb 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -988,7 +988,7 @@ static const char *fbcon_startup(void)
 	return display_desc;
 }
 
-static void fbcon_init(struct vc_data *vc, int init)
+static void fbcon_init(struct vc_data *vc, bool init)
 {
 	struct fb_info *info;
 	struct fbcon_ops *ops;
diff --git a/include/linux/console.h b/include/linux/console.h
index 93a1db5bf3b5..fc9450e0c78f 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -36,6 +36,8 @@ enum vc_intensity;
 /**
  * struct consw - callbacks for consoles
  *
+ * @con_init:   initialize the console on @vc. @init is true for the very first
+ *		call on this @vc.
  * @con_scroll: move lines from @top to @bottom in direction @dir by @lines.
  *		Return true if no generic handling should be done.
  *		Invoked by csi_M and printing to the console.
@@ -46,7 +48,7 @@ enum vc_intensity;
 struct consw {
 	struct module *owner;
 	const char *(*con_startup)(void);
-	void	(*con_init)(struct vc_data *vc, int init);
+	void	(*con_init)(struct vc_data *vc, bool init);
 	void	(*con_deinit)(struct vc_data *vc);
 	void	(*con_clear)(struct vc_data *vc, int sy, int sx, int height,
 			int width);
-- 
2.43.0

[PATCH v2 21/47] tty: vt: sanitize arguments of consw::con_clear()

[Jiri Slaby (SUSE)]

In consw::con_clear():
* Height is always 1, so drop it.
* Offsets and width are always unsigned values, so re-type them as such.

This needs a new __fbcon_clear() in the fbcon code to still handle
height which might not be 1 when called internally.

Note that tests for negative count/width are left in place -- they are
taken care of in the next patches.

And document the hook.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---
 drivers/tty/vt/vt.c                 |  2 +-
 drivers/video/console/dummycon.c    |  4 ++--
 drivers/video/console/mdacon.c      | 15 +++++---------
 drivers/video/console/newport_con.c |  6 +++---
 drivers/video/console/sticon.c      |  8 ++++----
 drivers/video/console/vgacon.c      |  4 ++--
 drivers/video/fbdev/core/fbcon.c    | 32 +++++++++++++++++------------
 include/linux/console.h             |  5 +++--
 8 files changed, 39 insertions(+), 37 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index fcb41c8724f3..b6f1449421bc 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1585,7 +1585,7 @@ static void csi_X(struct vc_data *vc)
 	vc_uniscr_clear_line(vc, vc->state.x, count);
 	scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
 	if (con_should_update(vc))
-		vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
+		vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, count);
 	vc->vc_need_wrap = 0;
 }
 
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
index f2cef9d9a4b5..0a69d5c216ee 100644
--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -109,8 +109,8 @@ static void dummycon_init(struct vc_data *vc, bool init)
 }
 
 static void dummycon_deinit(struct vc_data *vc) { }
-static void dummycon_clear(struct vc_data *vc, int sy, int sx, int height,
-			   int width) { }
+static void dummycon_clear(struct vc_data *vc, unsigned int sy, unsigned int sx,
+			   unsigned int width) { }
 static void dummycon_cursor(struct vc_data *vc, int mode) { }
 
 static bool dummycon_scroll(struct vc_data *vc, unsigned int top,
diff --git a/drivers/video/console/mdacon.c b/drivers/video/console/mdacon.c
index c5b255c96879..1ddbb6cd5b0c 100644
--- a/drivers/video/console/mdacon.c
+++ b/drivers/video/console/mdacon.c
@@ -442,23 +442,18 @@ static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
 	}
 }
 
-static void mdacon_clear(struct vc_data *c, int y, int x, 
-			  int height, int width)
+static void mdacon_clear(struct vc_data *c, unsigned int y, unsigned int x,
+			 unsigned int width)
 {
 	u16 *dest = mda_addr(x, y);
 	u16 eattr = mda_convert_attr(c->vc_video_erase_char);
 
-	if (width <= 0 || height <= 0)
+	if (width <= 0)
 		return;
 
-	if (x==0 && width==mda_num_columns) {
-		scr_memsetw(dest, eattr, height*width*2);
-	} else {
-		for (; height > 0; height--, dest+=mda_num_columns)
-			scr_memsetw(dest, eattr, width*2);
-	}
+	scr_memsetw(dest, eattr, width * 2);
 }
-                        
+
 static int mdacon_switch(struct vc_data *c)
 {
 	return 1;	/* redrawing needed */
diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index 12c64ef47087..55c6106b3507 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -346,12 +346,12 @@ static void newport_deinit(struct vc_data *c)
 	}
 }
 
-static void newport_clear(struct vc_data *vc, int sy, int sx, int height,
-			  int width)
+static void newport_clear(struct vc_data *vc, unsigned int sy, unsigned int sx,
+			  unsigned int width)
 {
 	int xend = ((sx + width) << 3) - 1;
 	int ystart = ((sy << 4) + topscan) & 0x3ff;
-	int yend = (((sy + height) << 4) + topscan - 1) & 0x3ff;
+	int yend = (((sy + 1) << 4) + topscan - 1) & 0x3ff;
 
 	if (logo_active)
 		return;
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index 0bfeabc3f7c7..d99c2a659bfd 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -300,13 +300,13 @@ static void sticon_deinit(struct vc_data *c)
 	sticon_set_def_font(i);
 }
 
-static void sticon_clear(struct vc_data *conp, int sy, int sx, int height,
-			 int width)
+static void sticon_clear(struct vc_data *conp, unsigned int sy, unsigned int sx,
+			 unsigned int width)
 {
-    if (!height || !width)
+    if (!width)
 	return;
 
-    sti_clear(sticon_sti, sy, sx, height, width,
+    sti_clear(sticon_sti, sy, sx, 1, width,
 	      conp->vc_video_erase_char, font_data[conp->vc_num]);
 }
 
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index 5d523753def8..85f29dec2c3d 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -1191,8 +1191,8 @@ static bool vgacon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
  *  The console `switch' structure for the VGA based console
  */
 
-static void vgacon_clear(struct vc_data *vc, int sy, int sx, int height,
-			 int width) { }
+static void vgacon_clear(struct vc_data *vc, unsigned int sy, unsigned int sx,
+			 unsigned int width) { }
 static void vgacon_putc(struct vc_data *vc, int c, int ypos, int xpos) { }
 static void vgacon_putcs(struct vc_data *vc, const unsigned short *s,
 			 int count, int ypos, int xpos) { }
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 939c5d893dfb..8a31a36483ea 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -1235,8 +1235,8 @@ static void fbcon_deinit(struct vc_data *vc)
  *  restriction is simplicity & efficiency at the moment.
  */
 
-static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
-			int width)
+static void __fbcon_clear(struct vc_data *vc, unsigned int sy, unsigned int sx,
+			  unsigned int height, unsigned int width)
 {
 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
 	struct fbcon_ops *ops = info->fbcon_par;
@@ -1273,6 +1273,12 @@ static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 		ops->clear(vc, info, real_y(p, sy), sx, height, width);
 }
 
+static void fbcon_clear(struct vc_data *vc, unsigned int sy, unsigned int sx,
+			unsigned int width)
+{
+	__fbcon_clear(vc, sy, sx, 1, width);
+}
+
 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 			int count, int ypos, int xpos)
 {
@@ -1760,7 +1766,7 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 		case SCROLL_MOVE:
 			fbcon_redraw_blit(vc, info, p, t, b - t - count,
 				     count);
-			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
+			__fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
 			scr_memsetw((unsigned short *) (vc->vc_origin +
 							vc->vc_size_row *
 							(b - count)),
@@ -1783,7 +1789,7 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 					    b - t - count, vc->vc_cols);
 			else
 				goto redraw_up;
-			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
+			__fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
 			break;
 
 		case SCROLL_PAN_REDRAW:
@@ -1801,7 +1807,7 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 							  vc->vc_rows - b, b);
 			} else
 				fbcon_redraw_move(vc, p, t + count, b - t - count, t);
-			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
+			__fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
 			break;
 
 		case SCROLL_PAN_MOVE:
@@ -1824,14 +1830,14 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 					    b - t - count, vc->vc_cols);
 			else
 				goto redraw_up;
-			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
+			__fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
 			break;
 
 		case SCROLL_REDRAW:
 		      redraw_up:
 			fbcon_redraw(vc, t, b - t - count,
 				     count * vc->vc_cols);
-			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
+			__fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
 			scr_memsetw((unsigned short *) (vc->vc_origin +
 							vc->vc_size_row *
 							(b - count)),
@@ -1848,7 +1854,7 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 		case SCROLL_MOVE:
 			fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
 				     -count);
-			fbcon_clear(vc, t, 0, count, vc->vc_cols);
+			__fbcon_clear(vc, t, 0, count, vc->vc_cols);
 			scr_memsetw((unsigned short *) (vc->vc_origin +
 							vc->vc_size_row *
 							t),
@@ -1871,7 +1877,7 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 					    b - t - count, vc->vc_cols);
 			else
 				goto redraw_down;
-			fbcon_clear(vc, t, 0, count, vc->vc_cols);
+			__fbcon_clear(vc, t, 0, count, vc->vc_cols);
 			break;
 
 		case SCROLL_PAN_MOVE:
@@ -1893,7 +1899,7 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 					    b - t - count, vc->vc_cols);
 			else
 				goto redraw_down;
-			fbcon_clear(vc, t, 0, count, vc->vc_cols);
+			__fbcon_clear(vc, t, 0, count, vc->vc_cols);
 			break;
 
 		case SCROLL_PAN_REDRAW:
@@ -1910,14 +1916,14 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 					fbcon_redraw_move(vc, p, count, t, 0);
 			} else
 				fbcon_redraw_move(vc, p, t, b - t - count, t + count);
-			fbcon_clear(vc, t, 0, count, vc->vc_cols);
+			__fbcon_clear(vc, t, 0, count, vc->vc_cols);
 			break;
 
 		case SCROLL_REDRAW:
 		      redraw_down:
 			fbcon_redraw(vc, b - 1, b - t - count,
 				     -count * vc->vc_cols);
-			fbcon_clear(vc, t, 0, count, vc->vc_cols);
+			__fbcon_clear(vc, t, 0, count, vc->vc_cols);
 			scr_memsetw((unsigned short *) (vc->vc_origin +
 							vc->vc_size_row *
 							t),
@@ -2196,7 +2202,7 @@ static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
 
 		oldc = vc->vc_video_erase_char;
 		vc->vc_video_erase_char &= charmask;
-		fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
+		__fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
 		vc->vc_video_erase_char = oldc;
 	}
 }
diff --git a/include/linux/console.h b/include/linux/console.h
index fc9450e0c78f..8fd96a5fca5f 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -38,6 +38,7 @@ enum vc_intensity;
  *
  * @con_init:   initialize the console on @vc. @init is true for the very first
  *		call on this @vc.
+ * @con_clear:  erase @count characters at [@x, @y] on @vc. @count >= 1.
  * @con_scroll: move lines from @top to @bottom in direction @dir by @lines.
  *		Return true if no generic handling should be done.
  *		Invoked by csi_M and printing to the console.
@@ -50,8 +51,8 @@ struct consw {
 	const char *(*con_startup)(void);
 	void	(*con_init)(struct vc_data *vc, bool init);
 	void	(*con_deinit)(struct vc_data *vc);
-	void	(*con_clear)(struct vc_data *vc, int sy, int sx, int height,
-			int width);
+	void	(*con_clear)(struct vc_data *vc, unsigned int y,
+			     unsigned int x, unsigned int count);
 	void	(*con_putc)(struct vc_data *vc, int c, int ypos, int xpos);
 	void	(*con_putcs)(struct vc_data *vc, const unsigned short *s,
 			int count, int ypos, int xpos);
-- 
2.43.0

[PATCH v2 22/47] tty: vt: remove checks for count in consw::con_clear() implementations

[Jiri Slaby (SUSE)]

'count' in consw::con_clear() is guaranteed to be positive. csi_X() (the
only caller) takes the minimum of the vc parameter (which is at least 1)
and count of characters till the end of the line. The latter is computed
as a subtraction of vc->vc_cols (count) and vc->state.x (offset). So for
the worst case, full line, it is 1.

Therefore, there is no point in checking zero or negative values (width
is now unsigned anyway).

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---
 drivers/video/console/mdacon.c | 3 ---
 drivers/video/console/sticon.c | 3 ---
 2 files changed, 6 deletions(-)

diff --git a/drivers/video/console/mdacon.c b/drivers/video/console/mdacon.c
index 1ddbb6cd5b0c..2ff2c9394d40 100644
--- a/drivers/video/console/mdacon.c
+++ b/drivers/video/console/mdacon.c
@@ -448,9 +448,6 @@ static void mdacon_clear(struct vc_data *c, unsigned int y, unsigned int x,
 	u16 *dest = mda_addr(x, y);
 	u16 eattr = mda_convert_attr(c->vc_video_erase_char);
 
-	if (width <= 0)
-		return;
-
 	scr_memsetw(dest, eattr, width * 2);
 }
 
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index d99c2a659bfd..b1d972d9a31c 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -303,9 +303,6 @@ static void sticon_deinit(struct vc_data *c)
 static void sticon_clear(struct vc_data *conp, unsigned int sy, unsigned int sx,
 			 unsigned int width)
 {
-    if (!width)
-	return;
-
     sti_clear(sticon_sti, sy, sx, 1, width,
 	      conp->vc_video_erase_char, font_data[conp->vc_num]);
 }
-- 
2.43.0

[PATCH v2 24/47] tty: vt: eliminate unneeded consw::con_putc() implementations

[Jiri Slaby (SUSE)]

All these consw::con_putc() implementations do the same as
consw::con_putcs() (only for one charattr) or even call
consw::con_putcs() on their own.

Drop them, as thanks to the new con_putc() helper in the previous patch,
the console code performs this already -- exactly if consw::con_putc()
is missing (NULL).

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---
 drivers/video/console/mdacon.c   |  6 ------
 drivers/video/console/sticon.c   | 12 ------------
 drivers/video/console/vgacon.c   |  2 --
 drivers/video/fbdev/core/fbcon.c |  9 ---------
 4 files changed, 29 deletions(-)

diff --git a/drivers/video/console/mdacon.c b/drivers/video/console/mdacon.c
index 2ff2c9394d40..01e779943c00 100644
--- a/drivers/video/console/mdacon.c
+++ b/drivers/video/console/mdacon.c
@@ -427,11 +427,6 @@ static inline u16 *mda_addr(unsigned int x, unsigned int y)
 	return mda_vram_base + y * mda_num_columns + x;
 }
 
-static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
-{
-	scr_writew(mda_convert_attr(ch), mda_addr(x, y));
-}
-
 static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
 		         int count, int y, int x)
 {
@@ -536,7 +531,6 @@ static const struct consw mda_con = {
 	.con_init =		mdacon_init,
 	.con_deinit =		mdacon_deinit,
 	.con_clear =		mdacon_clear,
-	.con_putc =		mdacon_putc,
 	.con_putcs =		mdacon_putcs,
 	.con_cursor =		mdacon_cursor,
 	.con_scroll =		mdacon_scroll,
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index b1d972d9a31c..2f87b5909d0d 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -71,17 +71,6 @@ static const char *sticon_startup(void)
     return "STI console";
 }
 
-static void sticon_putc(struct vc_data *conp, int c, int ypos, int xpos)
-{
-    if (vga_is_gfx || console_blanked)
-	    return;
-
-    if (conp->vc_mode != KD_TEXT)
-    	    return;
-
-    sti_putc(sticon_sti, c, ypos, xpos, font_data[conp->vc_num]);
-}
-
 static void sticon_putcs(struct vc_data *conp, const unsigned short *s,
 			 int count, int ypos, int xpos)
 {
@@ -362,7 +351,6 @@ static const struct consw sti_con = {
 	.con_init		= sticon_init,
 	.con_deinit		= sticon_deinit,
 	.con_clear		= sticon_clear,
-	.con_putc		= sticon_putc,
 	.con_putcs		= sticon_putcs,
 	.con_cursor		= sticon_cursor,
 	.con_scroll		= sticon_scroll,
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index 85f29dec2c3d..4beab11f87eb 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -1193,7 +1193,6 @@ static bool vgacon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
 
 static void vgacon_clear(struct vc_data *vc, unsigned int sy, unsigned int sx,
 			 unsigned int width) { }
-static void vgacon_putc(struct vc_data *vc, int c, int ypos, int xpos) { }
 static void vgacon_putcs(struct vc_data *vc, const unsigned short *s,
 			 int count, int ypos, int xpos) { }
 
@@ -1203,7 +1202,6 @@ const struct consw vga_con = {
 	.con_init = vgacon_init,
 	.con_deinit = vgacon_deinit,
 	.con_clear = vgacon_clear,
-	.con_putc = vgacon_putc,
 	.con_putcs = vgacon_putcs,
 	.con_cursor = vgacon_cursor,
 	.con_scroll = vgacon_scroll,
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 8a31a36483ea..38de0f8723aa 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -1292,14 +1292,6 @@ static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 			   get_color(vc, info, scr_readw(s), 0));
 }
 
-static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
-{
-	unsigned short chr;
-
-	scr_writew(c, &chr);
-	fbcon_putcs(vc, &chr, 1, ypos, xpos);
-}
-
 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
 {
 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
@@ -3159,7 +3151,6 @@ static const struct consw fb_con = {
 	.con_init 		= fbcon_init,
 	.con_deinit 		= fbcon_deinit,
 	.con_clear 		= fbcon_clear,
-	.con_putc 		= fbcon_putc,
 	.con_putcs 		= fbcon_putcs,
 	.con_cursor 		= fbcon_cursor,
 	.con_scroll 		= fbcon_scroll,
-- 
2.43.0

[PATCH v2 29/47] tty: vt: remove CM_* constants

[Jiri Slaby (SUSE)]

There is no difference between CM_MOVE and CM_DRAW. Either of them
enables the cursor. CM_ERASE then disables cursor.

So get rid of all of them and use simple "bool enable".

Note that this propagates down to the fbcon code.

And document the hook.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---
 drivers/tty/vt/vt.c                  |  4 ++--
 drivers/video/console/dummycon.c     |  2 +-
 drivers/video/console/mdacon.c       |  4 ++--
 drivers/video/console/newport_con.c  |  4 ++--
 drivers/video/console/sticon.c       |  6 +++---
 drivers/video/console/vgacon.c       |  6 +++---
 drivers/video/fbdev/core/bitblit.c   |  4 ++--
 drivers/video/fbdev/core/fbcon.c     | 19 +++++++++----------
 drivers/video/fbdev/core/fbcon.h     |  4 ++--
 drivers/video/fbdev/core/fbcon_ccw.c |  4 ++--
 drivers/video/fbdev/core/fbcon_cw.c  |  4 ++--
 drivers/video/fbdev/core/fbcon_ud.c  |  4 ++--
 drivers/video/fbdev/core/tileblit.c  |  4 ++--
 include/linux/console.h              |  8 ++------
 14 files changed, 36 insertions(+), 41 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 6091ffcf93d8..e4edcaf9d0a3 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -860,7 +860,7 @@ static void hide_cursor(struct vc_data *vc)
 	if (vc_is_sel(vc))
 		clear_selection();
 
-	vc->vc_sw->con_cursor(vc, CM_ERASE);
+	vc->vc_sw->con_cursor(vc, false);
 	hide_softcursor(vc);
 }
 
@@ -873,7 +873,7 @@ static void set_cursor(struct vc_data *vc)
 			clear_selection();
 		add_softcursor(vc);
 		if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
-			vc->vc_sw->con_cursor(vc, CM_DRAW);
+			vc->vc_sw->con_cursor(vc, true);
 	} else
 		hide_cursor(vc);
 }
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
index 188d9f3e201c..1171e27edef7 100644
--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -113,7 +113,7 @@ static void dummycon_init(struct vc_data *vc, bool init)
 static void dummycon_deinit(struct vc_data *vc) { }
 static void dummycon_clear(struct vc_data *vc, unsigned int sy, unsigned int sx,
 			   unsigned int width) { }
-static void dummycon_cursor(struct vc_data *vc, int mode) { }
+static void dummycon_cursor(struct vc_data *vc, bool enable) { }
 
 static bool dummycon_scroll(struct vc_data *vc, unsigned int top,
 			    unsigned int bottom, enum con_scroll dir,
diff --git a/drivers/video/console/mdacon.c b/drivers/video/console/mdacon.c
index b8822b615b2f..bc851a1d9f4d 100644
--- a/drivers/video/console/mdacon.c
+++ b/drivers/video/console/mdacon.c
@@ -470,9 +470,9 @@ static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
 	}
 }
 
-static void mdacon_cursor(struct vc_data *c, int mode)
+static void mdacon_cursor(struct vc_data *c, bool enable)
 {
-	if (mode == CM_ERASE) {
+	if (!enable) {
 		mda_set_cursor(mda_vram_len - 1);
 		return;
 	}
diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index f852717b88f0..e35406dea7c7 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -438,14 +438,14 @@ static void newport_putcs(struct vc_data *vc, const u16 *s,
 	}
 }
 
-static void newport_cursor(struct vc_data *vc, int mode)
+static void newport_cursor(struct vc_data *vc, bool enable)
 {
 	unsigned short treg;
 	int xcurs, ycurs;
 
 	treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
 
-	if (mode == CM_ERASE) {
+	if (!enable) {
 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
 				(treg & ~(VC2_CTRL_ECDISP)));
 		return;
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index 42480874db00..786e1b3a98ea 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -86,7 +86,7 @@ static void sticon_putcs(struct vc_data *conp, const u16 *s, unsigned int count,
     }
 }
 
-static void sticon_cursor(struct vc_data *conp, int mode)
+static void sticon_cursor(struct vc_data *conp, bool enable)
 {
     unsigned short car1;
 
@@ -95,7 +95,7 @@ static void sticon_cursor(struct vc_data *conp, int mode)
 	return;
 
     car1 = conp->vc_screenbuf[conp->state.x + conp->state.y * conp->vc_cols];
-    if (mode == CM_ERASE) {
+    if (!enable) {
 	sti_putc(sticon_sti, car1, conp->state.y, conp->state.x,
 		 font_data[conp->vc_num]);
 	return;
@@ -121,7 +121,7 @@ static bool sticon_scroll(struct vc_data *conp, unsigned int t,
     if (vga_is_gfx)
         return false;
 
-    sticon_cursor(conp, CM_ERASE);
+    sticon_cursor(conp, false);
 
     switch (dir) {
     case SM_UP:
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index 82d01a9ccd6d..d93eb15da435 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -503,7 +503,7 @@ static void vgacon_set_cursor_size(int from, int to)
 	raw_spin_unlock_irqrestore(&vga_lock, flags);
 }
 
-static void vgacon_cursor(struct vc_data *c, int mode)
+static void vgacon_cursor(struct vc_data *c, bool enable)
 {
 	unsigned int c_height;
 
@@ -516,7 +516,7 @@ static void vgacon_cursor(struct vc_data *c, int mode)
 
 	write_vga(14, (c->vc_pos - vga_vram_base) / 2);
 
-	if (mode == CM_ERASE) {
+	if (!enable) {
 	        if (vga_video_type >= VIDEO_TYPE_VGAC)
 			vgacon_set_cursor_size(31, 30);
 		else
@@ -1030,7 +1030,7 @@ static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight)
 			        /* void size to cause regs to be rewritten */
 				cursor_size_lastfrom = 0;
 				cursor_size_lastto = 0;
-				c->vc_sw->con_cursor(c, CM_DRAW);
+				c->vc_sw->con_cursor(c, true);
 			}
 			c->vc_font.height = c->vc_cell_height = fontheight;
 			vc_resize(c, 0, rows);	/* Adjust console size */
diff --git a/drivers/video/fbdev/core/bitblit.c b/drivers/video/fbdev/core/bitblit.c
index daff152f4c22..3ff1b2a8659e 100644
--- a/drivers/video/fbdev/core/bitblit.c
+++ b/drivers/video/fbdev/core/bitblit.c
@@ -233,7 +233,7 @@ static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
 	}
 }
 
-static void bit_cursor(struct vc_data *vc, struct fb_info *info, int mode,
+static void bit_cursor(struct vc_data *vc, struct fb_info *info, bool enable,
 		       int fg, int bg)
 {
 	struct fb_cursor cursor;
@@ -348,7 +348,7 @@ static void bit_cursor(struct vc_data *vc, struct fb_info *info, int mode,
 			mask[i++] = msk;
 	}
 
-	ops->cursor_state.enable = (mode != CM_ERASE) && !use_sw;
+	ops->cursor_state.enable = enable && !use_sw;
 
 	cursor.image.data = src;
 	cursor.image.fg_color = ops->cursor_state.image.fg_color;
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 7a7b2ac0d7a9..c1765a6ef490 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -351,7 +351,7 @@ static void fb_flashcursor(struct work_struct *work)
 	struct fb_info *info;
 	struct vc_data *vc = NULL;
 	int c;
-	int mode;
+	bool enable;
 	int ret;
 
 	/* FIXME: we should sort out the unbind locking instead */
@@ -375,9 +375,8 @@ static void fb_flashcursor(struct work_struct *work)
 	}
 
 	c = scr_readw((u16 *) vc->vc_pos);
-	mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
-		CM_ERASE : CM_DRAW;
-	ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
+	enable = ops->cursor_flash && !ops->cursor_state.enable;
+	ops->cursor(vc, info, enable, get_color(vc, info, c, 1),
 		    get_color(vc, info, c, 0));
 	console_unlock();
 
@@ -1301,7 +1300,7 @@ static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
 		ops->clear_margins(vc, info, margin_color, bottom_only);
 }
 
-static void fbcon_cursor(struct vc_data *vc, int mode)
+static void fbcon_cursor(struct vc_data *vc, bool enable)
 {
 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
 	struct fbcon_ops *ops = info->fbcon_par;
@@ -1317,12 +1316,12 @@ static void fbcon_cursor(struct vc_data *vc, int mode)
 	else
 		fbcon_add_cursor_work(info);
 
-	ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
+	ops->cursor_flash = enable;
 
 	if (!ops->cursor)
 		return;
 
-	ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
+	ops->cursor(vc, info, enable, get_color(vc, info, c, 1),
 		    get_color(vc, info, c, 0));
 }
 
@@ -1742,7 +1741,7 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 	if (fbcon_is_inactive(vc, info))
 		return true;
 
-	fbcon_cursor(vc, CM_ERASE);
+	fbcon_cursor(vc, false);
 
 	/*
 	 * ++Geert: Only use ywrap/ypan if the console is in text mode
@@ -2221,7 +2220,7 @@ static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
  	if (!fbcon_is_inactive(vc, info)) {
 		if (ops->blank_state != blank) {
 			ops->blank_state = blank;
-			fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
+			fbcon_cursor(vc, !blank);
 			ops->cursor_flash = (!blank);
 
 			if (fb_blank(info, blank))
@@ -2649,7 +2648,7 @@ void fbcon_suspended(struct fb_info *info)
 	vc = vc_cons[ops->currcon].d;
 
 	/* Clear cursor, restore saved data */
-	fbcon_cursor(vc, CM_ERASE);
+	fbcon_cursor(vc, false);
 }
 
 void fbcon_resumed(struct fb_info *info)
diff --git a/drivers/video/fbdev/core/fbcon.h b/drivers/video/fbdev/core/fbcon.h
index 0eaf54a21151..df70ea5ec5b3 100644
--- a/drivers/video/fbdev/core/fbcon.h
+++ b/drivers/video/fbdev/core/fbcon.h
@@ -61,8 +61,8 @@ struct fbcon_ops {
 		      int fg, int bg);
 	void (*clear_margins)(struct vc_data *vc, struct fb_info *info,
 			      int color, int bottom_only);
-	void (*cursor)(struct vc_data *vc, struct fb_info *info, int mode,
-		       int fg, int bg);
+	void (*cursor)(struct vc_data *vc, struct fb_info *info,
+		       bool enable, int fg, int bg);
 	int  (*update_start)(struct fb_info *info);
 	int  (*rotate_font)(struct fb_info *info, struct vc_data *vc);
 	struct fb_var_screeninfo var;  /* copy of the current fb_var_screeninfo */
diff --git a/drivers/video/fbdev/core/fbcon_ccw.c b/drivers/video/fbdev/core/fbcon_ccw.c
index 889423d580bc..f9b794ff7d39 100644
--- a/drivers/video/fbdev/core/fbcon_ccw.c
+++ b/drivers/video/fbdev/core/fbcon_ccw.c
@@ -218,7 +218,7 @@ static void ccw_clear_margins(struct vc_data *vc, struct fb_info *info,
 	}
 }
 
-static void ccw_cursor(struct vc_data *vc, struct fb_info *info, int mode,
+static void ccw_cursor(struct vc_data *vc, struct fb_info *info, bool enable,
 		       int fg, int bg)
 {
 	struct fb_cursor cursor;
@@ -349,7 +349,7 @@ static void ccw_cursor(struct vc_data *vc, struct fb_info *info, int mode,
 		kfree(tmp);
 	}
 
-	ops->cursor_state.enable = (mode != CM_ERASE) && !use_sw;
+	ops->cursor_state.enable = enable && !use_sw;
 
 	cursor.image.data = src;
 	cursor.image.fg_color = ops->cursor_state.image.fg_color;
diff --git a/drivers/video/fbdev/core/fbcon_cw.c b/drivers/video/fbdev/core/fbcon_cw.c
index a306ca5802e8..903f6fc174e1 100644
--- a/drivers/video/fbdev/core/fbcon_cw.c
+++ b/drivers/video/fbdev/core/fbcon_cw.c
@@ -201,7 +201,7 @@ static void cw_clear_margins(struct vc_data *vc, struct fb_info *info,
 	}
 }
 
-static void cw_cursor(struct vc_data *vc, struct fb_info *info, int mode,
+static void cw_cursor(struct vc_data *vc, struct fb_info *info, bool enable,
 		      int fg, int bg)
 {
 	struct fb_cursor cursor;
@@ -332,7 +332,7 @@ static void cw_cursor(struct vc_data *vc, struct fb_info *info, int mode,
 		kfree(tmp);
 	}
 
-	ops->cursor_state.enable = (mode != CM_ERASE) && !use_sw;
+	ops->cursor_state.enable = enable && !use_sw;
 
 	cursor.image.data = src;
 	cursor.image.fg_color = ops->cursor_state.image.fg_color;
diff --git a/drivers/video/fbdev/core/fbcon_ud.c b/drivers/video/fbdev/core/fbcon_ud.c
index f6fc458b46c7..594331936fd3 100644
--- a/drivers/video/fbdev/core/fbcon_ud.c
+++ b/drivers/video/fbdev/core/fbcon_ud.c
@@ -248,7 +248,7 @@ static void ud_clear_margins(struct vc_data *vc, struct fb_info *info,
 	}
 }
 
-static void ud_cursor(struct vc_data *vc, struct fb_info *info, int mode,
+static void ud_cursor(struct vc_data *vc, struct fb_info *info, bool enable,
 		      int fg, int bg)
 {
 	struct fb_cursor cursor;
@@ -372,7 +372,7 @@ static void ud_cursor(struct vc_data *vc, struct fb_info *info, int mode,
 			mask[i++] = ~msk;
 	}
 
-	ops->cursor_state.enable = (mode != CM_ERASE) && !use_sw;
+	ops->cursor_state.enable = enable && !use_sw;
 
 	cursor.image.data = src;
 	cursor.image.fg_color = ops->cursor_state.image.fg_color;
diff --git a/drivers/video/fbdev/core/tileblit.c b/drivers/video/fbdev/core/tileblit.c
index 2768eff247ba..eff7ec4da167 100644
--- a/drivers/video/fbdev/core/tileblit.c
+++ b/drivers/video/fbdev/core/tileblit.c
@@ -79,7 +79,7 @@ static void tile_clear_margins(struct vc_data *vc, struct fb_info *info,
 	return;
 }
 
-static void tile_cursor(struct vc_data *vc, struct fb_info *info, int mode,
+static void tile_cursor(struct vc_data *vc, struct fb_info *info, bool enable,
 			int fg, int bg)
 {
 	struct fb_tilecursor cursor;
@@ -87,7 +87,7 @@ static void tile_cursor(struct vc_data *vc, struct fb_info *info, int mode,
 
 	cursor.sx = vc->state.x;
 	cursor.sy = vc->state.y;
-	cursor.mode = (mode == CM_ERASE || use_sw) ? 0 : 1;
+	cursor.mode = enable && !use_sw;
 	cursor.fg = fg;
 	cursor.bg = bg;
 
diff --git a/include/linux/console.h b/include/linux/console.h
index 82d55764a66f..a6a46b5efd66 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -42,6 +42,7 @@ enum vc_intensity;
  * @con_putc:   emit one character with attributes @ca to [@x, @y] on @vc.
  *		(optional -- @con_putcs would be called instead)
  * @con_putcs:  emit @count characters with attributes @s to [@x, @y] on @vc.
+ * @con_cursor: enable/disable cursor depending on @enable
  * @con_scroll: move lines from @top to @bottom in direction @dir by @lines.
  *		Return true if no generic handling should be done.
  *		Invoked by csi_M and printing to the console.
@@ -61,7 +62,7 @@ struct consw {
 	void	(*con_putcs)(struct vc_data *vc, const u16 *s,
 			     unsigned int count, unsigned int ypos,
 			     unsigned int xpos);
-	void	(*con_cursor)(struct vc_data *vc, int mode);
+	void	(*con_cursor)(struct vc_data *vc, bool enable);
 	bool	(*con_scroll)(struct vc_data *vc, unsigned int top,
 			unsigned int bottom, enum con_scroll dir,
 			unsigned int lines);
@@ -128,11 +129,6 @@ static inline void con_debug_enter(struct vc_data *vc) { }
 static inline void con_debug_leave(void) { }
 #endif
 
-/* cursor */
-#define CM_DRAW     (1)
-#define CM_ERASE    (2)
-#define CM_MOVE     (3)
-
 /*
  * The interface for a console, or any other device that wants to capture
  * console messages (printer driver?)
-- 
2.43.0

[PATCH v2 30/47] tty: vt: make consw::con_switch() return a bool

[Jiri Slaby (SUSE)]

The non-zero (true) return value from consw::con_switch() means a redraw
is needed. So make this return type a bool explicitly instead of int.
The latter might imply that -Eerrors are expected. They are not.

And document the hook.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---
 drivers/tty/vt/vt.c                 | 2 +-
 drivers/video/console/dummycon.c    | 4 ++--
 drivers/video/console/mdacon.c      | 4 ++--
 drivers/video/console/newport_con.c | 4 ++--
 drivers/video/console/sticon.c      | 4 ++--
 drivers/video/console/vgacon.c      | 4 ++--
 drivers/video/fbdev/core/fbcon.c    | 6 +++---
 include/linux/console.h             | 4 +++-
 8 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index e4edcaf9d0a3..fd868046f586 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -970,7 +970,7 @@ void redraw_screen(struct vc_data *vc, int is_switch)
 	}
 
 	if (redraw) {
-		int update;
+		bool update;
 		int old_was_color = vc->vc_can_do_color;
 
 		set_origin(vc);
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
index 1171e27edef7..c8d5aa0e3ed0 100644
--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -122,9 +122,9 @@ static bool dummycon_scroll(struct vc_data *vc, unsigned int top,
 	return false;
 }
 
-static int dummycon_switch(struct vc_data *vc)
+static bool dummycon_switch(struct vc_data *vc)
 {
-	return 0;
+	return false;
 }
 
 /*
diff --git a/drivers/video/console/mdacon.c b/drivers/video/console/mdacon.c
index bc851a1d9f4d..4485ef923bb3 100644
--- a/drivers/video/console/mdacon.c
+++ b/drivers/video/console/mdacon.c
@@ -446,9 +446,9 @@ static void mdacon_clear(struct vc_data *c, unsigned int y, unsigned int x,
 	scr_memsetw(dest, eattr, width * 2);
 }
 
-static int mdacon_switch(struct vc_data *c)
+static bool mdacon_switch(struct vc_data *c)
 {
-	return 1;	/* redrawing needed */
+	return true;	/* redrawing needed */
 }
 
 static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index e35406dea7c7..039d1c9937d2 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -459,7 +459,7 @@ static void newport_cursor(struct vc_data *vc, bool enable)
 	newport_vc2_set(npregs, VC2_IREG_CURSY, ycurs);
 }
 
-static int newport_switch(struct vc_data *vc)
+static bool newport_switch(struct vc_data *vc)
 {
 	static int logo_drawn = 0;
 
@@ -473,7 +473,7 @@ static int newport_switch(struct vc_data *vc)
 		}
 	}
 
-	return 1;
+	return true;
 }
 
 static int newport_blank(struct vc_data *c, int blank, int mode_switch)
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index 786e1b3a98ea..f3bb48a0e980 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -293,9 +293,9 @@ static void sticon_clear(struct vc_data *conp, unsigned int sy, unsigned int sx,
 	      conp->vc_video_erase_char, font_data[conp->vc_num]);
 }
 
-static int sticon_switch(struct vc_data *conp)
+static bool sticon_switch(struct vc_data *conp)
 {
-    return 1;	/* needs refreshing */
+    return true;	/* needs refreshing */
 }
 
 static int sticon_blank(struct vc_data *c, int blank, int mode_switch)
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index d93eb15da435..f89eb53c0b79 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -614,7 +614,7 @@ static void vgacon_doresize(struct vc_data *c,
 	raw_spin_unlock_irqrestore(&vga_lock, flags);
 }
 
-static int vgacon_switch(struct vc_data *c)
+static bool vgacon_switch(struct vc_data *c)
 {
 	int x = c->vc_cols * VGA_FONTWIDTH;
 	int y = c->vc_rows * c->vc_cell_height;
@@ -643,7 +643,7 @@ static int vgacon_switch(struct vc_data *c)
 			vgacon_doresize(c, c->vc_cols, c->vc_rows);
 	}
 
-	return 0;		/* Redrawing not needed */
+	return false;		/* Redrawing not needed */
 }
 
 static void vga_set_palette(struct vc_data *vc, const unsigned char *table)
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index c1765a6ef490..d5d924225209 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -2056,7 +2056,7 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,
 	return 0;
 }
 
-static int fbcon_switch(struct vc_data *vc)
+static bool fbcon_switch(struct vc_data *vc)
 {
 	struct fb_info *info, *old_info = NULL;
 	struct fbcon_ops *ops;
@@ -2178,9 +2178,9 @@ static int fbcon_switch(struct vc_data *vc)
 			      vc->vc_origin + vc->vc_size_row * vc->vc_top,
 			      vc->vc_size_row * (vc->vc_bottom -
 						 vc->vc_top) / 2);
-		return 0;
+		return false;
 	}
-	return 1;
+	return true;
 }
 
 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
diff --git a/include/linux/console.h b/include/linux/console.h
index a6a46b5efd66..f7c6b5fc3a36 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -46,6 +46,8 @@ enum vc_intensity;
  * @con_scroll: move lines from @top to @bottom in direction @dir by @lines.
  *		Return true if no generic handling should be done.
  *		Invoked by csi_M and printing to the console.
+ * @con_switch: notifier about the console switch; it is supposed to return
+ *		true if a redraw is needed.
  * @con_set_palette: sets the palette of the console to @table (optional)
  * @con_scrolldelta: the contents of the console should be scrolled by @lines.
  *		     Invoked by user. (optional)
@@ -66,7 +68,7 @@ struct consw {
 	bool	(*con_scroll)(struct vc_data *vc, unsigned int top,
 			unsigned int bottom, enum con_scroll dir,
 			unsigned int lines);
-	int	(*con_switch)(struct vc_data *vc);
+	bool	(*con_switch)(struct vc_data *vc);
 	int	(*con_blank)(struct vc_data *vc, int blank, int mode_switch);
 	int	(*con_font_set)(struct vc_data *vc, struct console_font *font,
 			unsigned int vpitch, unsigned int flags);
-- 
2.43.0

[PATCH v2 33/47] tty: vt: use VESA blanking constants

[Jiri Slaby (SUSE)]

There are VESA blanking constants defined in vesa.h. So use them in the
console code instead of constant values.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---

Notes:
    [v2] reword the commit log after vesa.h introduction

 drivers/tty/vt/vt.c                 | 9 +++++----
 drivers/video/console/newport_con.c | 2 +-
 drivers/video/console/sticon.c      | 2 +-
 drivers/video/console/vgacon.c      | 6 +++---
 4 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 13be125a06aa..0d5d7b5074a4 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -4320,7 +4320,7 @@ static int set_vesa_blanking(u8 __user *mode_user)
 		return -EFAULT;
 
 	console_lock();
-	vesa_blank_mode = (mode < 4) ? mode : 0;
+	vesa_blank_mode = (mode < 4) ? mode : VESA_NO_BLANKING;
 	console_unlock();
 
 	return 0;
@@ -4347,7 +4347,7 @@ void do_blank_screen(int entering_gfx)
 	if (entering_gfx) {
 		hide_cursor(vc);
 		save_screen(vc);
-		vc->vc_sw->con_blank(vc, 1, 1);
+		vc->vc_sw->con_blank(vc, VESA_VSYNC_SUSPEND, 1);
 		console_blanked = fg_console + 1;
 		blank_state = blank_off;
 		set_origin(vc);
@@ -4368,7 +4368,8 @@ void do_blank_screen(int entering_gfx)
 
 	save_screen(vc);
 	/* In case we need to reset origin, blanking hook returns 1 */
-	i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
+	i = vc->vc_sw->con_blank(vc, vesa_off_interval ? VESA_VSYNC_SUSPEND :
+				 (vesa_blank_mode + 1), 0);
 	console_blanked = fg_console + 1;
 	if (i)
 		set_origin(vc);
@@ -4419,7 +4420,7 @@ void do_unblank_screen(int leaving_gfx)
 	}
 
 	console_blanked = 0;
-	if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
+	if (vc->vc_sw->con_blank(vc, VESA_NO_BLANKING, leaving_gfx))
 		/* Low-level driver cannot restore -> do it ourselves */
 		update_screen(vc);
 	if (console_blank_hook)
diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index 039d1c9937d2..ad3a09142770 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -480,7 +480,7 @@ static int newport_blank(struct vc_data *c, int blank, int mode_switch)
 {
 	unsigned short treg;
 
-	if (blank == 0) {
+	if (blank == VESA_NO_BLANKING) {
 		/* unblank console */
 		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index f3bb48a0e980..817b89c45e81 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -300,7 +300,7 @@ static bool sticon_switch(struct vc_data *conp)
 
 static int sticon_blank(struct vc_data *c, int blank, int mode_switch)
 {
-    if (blank == 0) {
+    if (blank == VESA_NO_BLANKING) {
 	if (mode_switch)
 	    vga_is_gfx = 0;
 	return 1;
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index 804b6a180b60..02eccd9b3542 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -800,10 +800,10 @@ static void vga_pal_blank(struct vgastate *state)
 static int vgacon_blank(struct vc_data *c, int blank, int mode_switch)
 {
 	switch (blank) {
-	case 0:		/* Unblank */
+	case VESA_NO_BLANKING:		/* Unblank */
 		if (vga_vesa_blanked) {
 			vga_vesa_unblank(&vgastate);
-			vga_vesa_blanked = 0;
+			vga_vesa_blanked = VESA_NO_BLANKING;
 		}
 		if (vga_palette_blanked) {
 			vga_set_palette(c, color_table);
@@ -813,7 +813,7 @@ static int vgacon_blank(struct vc_data *c, int blank, int mode_switch)
 		vga_is_gfx = false;
 		/* Tell console.c that it has to restore the screen itself */
 		return 1;
-	case 1:		/* Normal blanking */
+	case VESA_VSYNC_SUSPEND:	/* Normal blanking */
 		if (!mode_switch && vga_video_type == VIDEO_TYPE_VGAC) {
 			vga_pal_blank(&vgastate);
 			vga_palette_blanked = true;
-- 
2.43.0

[PATCH v2 34/47] tty: vt: use enum constants for VESA blanking modes

[Jiri Slaby (SUSE)]

Use the new enum for VESA constants. This improves type checking in
consw::con_blank().

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---

Notes:
    [v2] the enum is added earlier, so reword and rebase

 drivers/tty/vt/vt.c                 | 4 ++--
 drivers/video/console/dummycon.c    | 6 ++++--
 drivers/video/console/mdacon.c      | 3 ++-
 drivers/video/console/newport_con.c | 3 ++-
 drivers/video/console/sticon.c      | 3 ++-
 drivers/video/console/vgacon.c      | 7 ++++---
 drivers/video/fbdev/core/fbcon.c    | 3 ++-
 include/linux/console.h             | 3 ++-
 8 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 0d5d7b5074a4..de9148094c2d 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -175,7 +175,7 @@ int do_poke_blanked_console;
 int console_blanked;
 EXPORT_SYMBOL(console_blanked);
 
-static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
+static enum vesa_blank_mode vesa_blank_mode;
 static int vesa_off_interval;
 static int blankinterval;
 core_param(consoleblank, blankinterval, int, 0444);
@@ -4320,7 +4320,7 @@ static int set_vesa_blanking(u8 __user *mode_user)
 		return -EFAULT;
 
 	console_lock();
-	vesa_blank_mode = (mode < 4) ? mode : VESA_NO_BLANKING;
+	vesa_blank_mode = (mode <= VESA_BLANK_MAX) ? mode : VESA_NO_BLANKING;
 	console_unlock();
 
 	return 0;
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
index c8d5aa0e3ed0..d86c1d798690 100644
--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -79,7 +79,8 @@ static void dummycon_putcs(struct vc_data *vc, const u16 *s, unsigned int count,
 	raw_notifier_call_chain(&dummycon_output_nh, 0, NULL);
 }
 
-static int dummycon_blank(struct vc_data *vc, int blank, int mode_switch)
+static int dummycon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
+			  int mode_switch)
 {
 	/* Redraw, so that we get putc(s) for output done while blanked */
 	return 1;
@@ -89,7 +90,8 @@ static void dummycon_putc(struct vc_data *vc, u16 c, unsigned int y,
 			  unsigned int x) { }
 static void dummycon_putcs(struct vc_data *vc, const u16 *s, unsigned int count,
 			   unsigned int ypos, unsigned int xpos) { }
-static int dummycon_blank(struct vc_data *vc, int blank, int mode_switch)
+static int dummycon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
+			  int mode_switch)
 {
 	return 0;
 }
diff --git a/drivers/video/console/mdacon.c b/drivers/video/console/mdacon.c
index 4485ef923bb3..63e3ce678aab 100644
--- a/drivers/video/console/mdacon.c
+++ b/drivers/video/console/mdacon.c
@@ -451,7 +451,8 @@ static bool mdacon_switch(struct vc_data *c)
 	return true;	/* redrawing needed */
 }
 
-static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
+static int mdacon_blank(struct vc_data *c, enum vesa_blank_mode blank,
+			int mode_switch)
 {
 	if (mda_type == TYPE_MDA) {
 		if (blank) 
diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index ad3a09142770..38437a53b7f1 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -476,7 +476,8 @@ static bool newport_switch(struct vc_data *vc)
 	return true;
 }
 
-static int newport_blank(struct vc_data *c, int blank, int mode_switch)
+static int newport_blank(struct vc_data *c, enum vesa_blank_mode blank,
+			 int mode_switch)
 {
 	unsigned short treg;
 
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index 817b89c45e81..e9d5d1f92883 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -298,7 +298,8 @@ static bool sticon_switch(struct vc_data *conp)
     return true;	/* needs refreshing */
 }
 
-static int sticon_blank(struct vc_data *c, int blank, int mode_switch)
+static int sticon_blank(struct vc_data *c, enum vesa_blank_mode blank,
+			int mode_switch)
 {
     if (blank == VESA_NO_BLANKING) {
 	if (mode_switch)
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index 02eccd9b3542..84f3682704c7 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -81,7 +81,7 @@ static unsigned int	vga_video_num_lines;			/* Number of text lines */
 static bool		vga_can_do_color;			/* Do we support colors? */
 static unsigned int	vga_default_font_height __read_mostly;	/* Height of default screen font */
 static unsigned char	vga_video_type		__read_mostly;	/* Card type */
-static int		vga_vesa_blanked;
+static enum vesa_blank_mode vga_vesa_blanked;
 static bool 		vga_palette_blanked;
 static bool 		vga_is_gfx;
 static bool 		vga_512_chars;
@@ -683,7 +683,7 @@ static struct {
 	unsigned char ClockingMode;	/* Seq-Controller:01h */
 } vga_state;
 
-static void vga_vesa_blank(struct vgastate *state, int mode)
+static void vga_vesa_blank(struct vgastate *state, enum vesa_blank_mode mode)
 {
 	/* save original values of VGA controller registers */
 	if (!vga_vesa_blanked) {
@@ -797,7 +797,8 @@ static void vga_pal_blank(struct vgastate *state)
 	}
 }
 
-static int vgacon_blank(struct vc_data *c, int blank, int mode_switch)
+static int vgacon_blank(struct vc_data *c, enum vesa_blank_mode blank,
+			int mode_switch)
 {
 	switch (blank) {
 	case VESA_NO_BLANKING:		/* Unblank */
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index d5d924225209..69be5f2106bc 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -2198,7 +2198,8 @@ static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
 	}
 }
 
-static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
+static int fbcon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
+		       int mode_switch)
 {
 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
 	struct fbcon_ops *ops = info->fbcon_par;
diff --git a/include/linux/console.h b/include/linux/console.h
index 860f82756c9c..69040d7c8f97 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -70,7 +70,8 @@ struct consw {
 			unsigned int bottom, enum con_scroll dir,
 			unsigned int lines);
 	bool	(*con_switch)(struct vc_data *vc);
-	int	(*con_blank)(struct vc_data *vc, int blank, int mode_switch);
+	int	(*con_blank)(struct vc_data *vc, enum vesa_blank_mode blank,
+			     int mode_switch);
 	int	(*con_font_set)(struct vc_data *vc, struct console_font *font,
 			unsigned int vpitch, unsigned int flags);
 	int	(*con_font_get)(struct vc_data *vc, struct console_font *font,
-- 
2.43.0

[PATCH v2 35/47] tty: vt: make types around consw::con_blank() bool

[Jiri Slaby (SUSE)]

Both the mode_switch parameter and the return value (a redraw needed)
are true/false. So switch them to bool, so that users won't return
-Eerrors or anything else.

And document the hook.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---
 drivers/video/console/dummycon.c    | 12 ++++++------
 drivers/video/console/mdacon.c      |  8 ++++----
 drivers/video/console/newport_con.c |  7 ++++---
 drivers/video/console/sticon.c      |  9 +++++----
 drivers/video/console/vgacon.c      |  4 ++--
 drivers/video/fbdev/core/fbcon.c    |  6 +++---
 include/linux/console.h             |  7 +++++--
 7 files changed, 29 insertions(+), 24 deletions(-)

diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
index d86c1d798690..139049368fdc 100644
--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -79,21 +79,21 @@ static void dummycon_putcs(struct vc_data *vc, const u16 *s, unsigned int count,
 	raw_notifier_call_chain(&dummycon_output_nh, 0, NULL);
 }
 
-static int dummycon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
-			  int mode_switch)
+static bool dummycon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
+			   bool mode_switch)
 {
 	/* Redraw, so that we get putc(s) for output done while blanked */
-	return 1;
+	return true;
 }
 #else
 static void dummycon_putc(struct vc_data *vc, u16 c, unsigned int y,
 			  unsigned int x) { }
 static void dummycon_putcs(struct vc_data *vc, const u16 *s, unsigned int count,
 			   unsigned int ypos, unsigned int xpos) { }
-static int dummycon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
-			  int mode_switch)
+static bool dummycon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
+			   bool mode_switch)
 {
-	return 0;
+	return false;
 }
 #endif
 
diff --git a/drivers/video/console/mdacon.c b/drivers/video/console/mdacon.c
index 63e3ce678aab..c0e1f4554a44 100644
--- a/drivers/video/console/mdacon.c
+++ b/drivers/video/console/mdacon.c
@@ -451,8 +451,8 @@ static bool mdacon_switch(struct vc_data *c)
 	return true;	/* redrawing needed */
 }
 
-static int mdacon_blank(struct vc_data *c, enum vesa_blank_mode blank,
-			int mode_switch)
+static bool mdacon_blank(struct vc_data *c, enum vesa_blank_mode blank,
+			 bool mode_switch)
 {
 	if (mda_type == TYPE_MDA) {
 		if (blank) 
@@ -460,14 +460,14 @@ static int mdacon_blank(struct vc_data *c, enum vesa_blank_mode blank,
 				mda_convert_attr(c->vc_video_erase_char),
 				c->vc_screenbuf_size);
 		/* Tell console.c that it has to restore the screen itself */
-		return 1;
+		return true;
 	} else {
 		if (blank)
 			outb_p(0x00, mda_mode_port);	/* disable video */
 		else
 			outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, 
 				mda_mode_port);
-		return 0;
+		return false;
 	}
 }
 
diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index 38437a53b7f1..dbb31bf87bf1 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -476,8 +476,8 @@ static bool newport_switch(struct vc_data *vc)
 	return true;
 }
 
-static int newport_blank(struct vc_data *c, enum vesa_blank_mode blank,
-			 int mode_switch)
+static bool newport_blank(struct vc_data *c, enum vesa_blank_mode blank,
+			  bool mode_switch)
 {
 	unsigned short treg;
 
@@ -492,7 +492,8 @@ static int newport_blank(struct vc_data *c, enum vesa_blank_mode blank,
 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
 				(treg & ~(VC2_CTRL_EDISP)));
 	}
-	return 1;
+
+	return true;
 }
 
 static int newport_set_font(int unit, struct console_font *op, unsigned int vpitch)
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index e9d5d1f92883..cbb9ef438214 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -298,19 +298,20 @@ static bool sticon_switch(struct vc_data *conp)
     return true;	/* needs refreshing */
 }
 
-static int sticon_blank(struct vc_data *c, enum vesa_blank_mode blank,
-			int mode_switch)
+static bool sticon_blank(struct vc_data *c, enum vesa_blank_mode blank,
+			 bool mode_switch)
 {
     if (blank == VESA_NO_BLANKING) {
 	if (mode_switch)
 	    vga_is_gfx = 0;
-	return 1;
+	return true;
     }
     sti_clear(sticon_sti, 0, 0, c->vc_rows, c->vc_cols, BLANK,
 	      font_data[c->vc_num]);
     if (mode_switch)
 	vga_is_gfx = 1;
-    return 1;
+
+    return true;
 }
 
 static u8 sticon_build_attr(struct vc_data *conp, u8 color,
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index 84f3682704c7..c9a22118102f 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -797,8 +797,8 @@ static void vga_pal_blank(struct vgastate *state)
 	}
 }
 
-static int vgacon_blank(struct vc_data *c, enum vesa_blank_mode blank,
-			int mode_switch)
+static bool vgacon_blank(struct vc_data *c, enum vesa_blank_mode blank,
+			 bool mode_switch)
 {
 	switch (blank) {
 	case VESA_NO_BLANKING:		/* Unblank */
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 69be5f2106bc..eee2adf5c682 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -2198,8 +2198,8 @@ static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
 	}
 }
 
-static int fbcon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
-		       int mode_switch)
+static bool fbcon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
+			bool mode_switch)
 {
 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
 	struct fbcon_ops *ops = info->fbcon_par;
@@ -2238,7 +2238,7 @@ static int fbcon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
 	else
 		fbcon_add_cursor_work(info);
 
-	return 0;
+	return false;
 }
 
 static void fbcon_debug_enter(struct vc_data *vc)
diff --git a/include/linux/console.h b/include/linux/console.h
index 69040d7c8f97..6392bcd2fe7c 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -49,6 +49,9 @@ enum vc_intensity;
  *		Invoked by csi_M and printing to the console.
  * @con_switch: notifier about the console switch; it is supposed to return
  *		true if a redraw is needed.
+ * @con_blank:  blank/unblank the console. The target mode is passed in @blank.
+ *		@mode_switch is set if changing from/to text/graphics. The hook
+ *		is supposed to return true if a redraw is needed.
  * @con_set_palette: sets the palette of the console to @table (optional)
  * @con_scrolldelta: the contents of the console should be scrolled by @lines.
  *		     Invoked by user. (optional)
@@ -70,8 +73,8 @@ struct consw {
 			unsigned int bottom, enum con_scroll dir,
 			unsigned int lines);
 	bool	(*con_switch)(struct vc_data *vc);
-	int	(*con_blank)(struct vc_data *vc, enum vesa_blank_mode blank,
-			     int mode_switch);
+	bool	(*con_blank)(struct vc_data *vc, enum vesa_blank_mode blank,
+			     bool mode_switch);
 	int	(*con_font_set)(struct vc_data *vc, struct console_font *font,
 			unsigned int vpitch, unsigned int flags);
 	int	(*con_font_get)(struct vc_data *vc, struct console_font *font,
-- 
2.43.0

[PATCH v2 36/47] tty: vt: make font of consw::con_font_set() const

[Jiri Slaby (SUSE)]

Provided the font parameter of consw::con_font_set() is not supposed to
be changed, make it const.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---
 drivers/tty/vt/vt.c                 | 2 +-
 drivers/video/console/newport_con.c | 5 +++--
 drivers/video/console/sticon.c      | 4 ++--
 drivers/video/console/vgacon.c      | 2 +-
 drivers/video/fbdev/core/fbcon.c    | 2 +-
 include/linux/console.h             | 5 +++--
 6 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index de9148094c2d..0ac537f82f7a 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -4625,7 +4625,7 @@ static int con_font_get(struct vc_data *vc, struct console_font_op *op)
 	return rc;
 }
 
-static int con_font_set(struct vc_data *vc, struct console_font_op *op)
+static int con_font_set(struct vc_data *vc, const struct console_font_op *op)
 {
 	struct console_font font;
 	int rc = -EINVAL;
diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index dbb31bf87bf1..4203bd5fd0a1 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -496,7 +496,8 @@ static bool newport_blank(struct vc_data *c, enum vesa_blank_mode blank,
 	return true;
 }
 
-static int newport_set_font(int unit, struct console_font *op, unsigned int vpitch)
+static int newport_set_font(int unit, const struct console_font *op,
+			    unsigned int vpitch)
 {
 	int w = op->width;
 	int h = op->height;
@@ -568,7 +569,7 @@ static int newport_font_default(struct vc_data *vc, struct console_font *op, cha
 	return newport_set_def_font(vc->vc_num, op);
 }
 
-static int newport_font_set(struct vc_data *vc, struct console_font *font,
+static int newport_font_set(struct vc_data *vc, const struct console_font *font,
 			    unsigned int vpitch, unsigned int flags)
 {
 	return newport_set_font(vc->vc_num, font, vpitch);
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index cbb9ef438214..710201fb8ce4 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -153,7 +153,7 @@ static void sticon_set_def_font(int unit)
 	}
 }
 
-static int sticon_set_font(struct vc_data *vc, struct console_font *op,
+static int sticon_set_font(struct vc_data *vc, const struct console_font *op,
 			   unsigned int vpitch)
 {
 	struct sti_struct *sti = sticon_sti;
@@ -253,7 +253,7 @@ static int sticon_font_default(struct vc_data *vc, struct console_font *op, char
 	return 0;
 }
 
-static int sticon_font_set(struct vc_data *vc, struct console_font *font,
+static int sticon_font_set(struct vc_data *vc, const struct console_font *font,
 			   unsigned int vpitch, unsigned int flags)
 {
 	return sticon_set_font(vc, font, vpitch);
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index c9a22118102f..4d1c8f5863af 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -1039,7 +1039,7 @@ static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight)
 	return 0;
 }
 
-static int vgacon_font_set(struct vc_data *c, struct console_font *font,
+static int vgacon_font_set(struct vc_data *c, const struct console_font *font,
 			   unsigned int vpitch, unsigned int flags)
 {
 	unsigned charcount = font->charcount;
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index eee2adf5c682..62474630c4d4 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -2460,7 +2460,7 @@ static int fbcon_do_set_font(struct vc_data *vc, int w, int h, int charcount,
  *  but lets not assume that, since charcount of 512 is small for unicode support.
  */
 
-static int fbcon_set_font(struct vc_data *vc, struct console_font *font,
+static int fbcon_set_font(struct vc_data *vc, const struct console_font *font,
 			  unsigned int vpitch, unsigned int flags)
 {
 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
diff --git a/include/linux/console.h b/include/linux/console.h
index 6392bcd2fe7c..0a9f4cbdde83 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -75,8 +75,9 @@ struct consw {
 	bool	(*con_switch)(struct vc_data *vc);
 	bool	(*con_blank)(struct vc_data *vc, enum vesa_blank_mode blank,
 			     bool mode_switch);
-	int	(*con_font_set)(struct vc_data *vc, struct console_font *font,
-			unsigned int vpitch, unsigned int flags);
+	int	(*con_font_set)(struct vc_data *vc,
+				const struct console_font *font,
+				unsigned int vpitch, unsigned int flags);
 	int	(*con_font_get)(struct vc_data *vc, struct console_font *font,
 			unsigned int vpitch);
 	int	(*con_font_default)(struct vc_data *vc,
-- 
2.43.0

[PATCH v2 37/47] tty: vt: make consw::con_font_default()'s name const

[Jiri Slaby (SUSE)]

It's a name after all and that is not supposed to be changed. So make it
const to make this obvious.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-parisc@vger.kernel.org
---
 drivers/video/console/newport_con.c | 3 ++-
 drivers/video/console/sticon.c      | 3 ++-
 drivers/video/fbdev/core/fbcon.c    | 3 ++-
 include/linux/console.h             | 2 +-
 4 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index 4203bd5fd0a1..a51cfc1d560e 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -564,7 +564,8 @@ static int newport_set_def_font(int unit, struct console_font *op)
 	return 0;
 }
 
-static int newport_font_default(struct vc_data *vc, struct console_font *op, char *name)
+static int newport_font_default(struct vc_data *vc, struct console_font *op,
+				const char *name)
 {
 	return newport_set_def_font(vc->vc_num, op);
 }
diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c
index 710201fb8ce4..4c7b4959a1aa 100644
--- a/drivers/video/console/sticon.c
+++ b/drivers/video/console/sticon.c
@@ -246,7 +246,8 @@ static int sticon_set_font(struct vc_data *vc, const struct console_font *op,
 	return 0;
 }
 
-static int sticon_font_default(struct vc_data *vc, struct console_font *op, char *name)
+static int sticon_font_default(struct vc_data *vc, struct console_font *op,
+			       const char *name)
 {
 	sticon_set_def_font(vc->vc_num);
 
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 62474630c4d4..657160eec0a5 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -2533,7 +2533,8 @@ static int fbcon_set_font(struct vc_data *vc, const struct console_font *font,
 	return fbcon_do_set_font(vc, font->width, font->height, charcount, new_data, 1);
 }
 
-static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
+static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font,
+			      const char *name)
 {
 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
 	const struct font_desc *f;
diff --git a/include/linux/console.h b/include/linux/console.h
index 0a9f4cbdde83..6bb7e5e37ae4 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -81,7 +81,7 @@ struct consw {
 	int	(*con_font_get)(struct vc_data *vc, struct console_font *font,
 			unsigned int vpitch);
 	int	(*con_font_default)(struct vc_data *vc,
-			struct console_font *font, char *name);
+			struct console_font *font, const char *name);
 	int     (*con_resize)(struct vc_data *vc, unsigned int width,
 			      unsigned int height, bool from_user);
 	void	(*con_set_palette)(struct vc_data *vc,
-- 
2.43.0

Re: [PATCH v2 00/47] tty: vt: cleanup and documentation

[Helge Deller]

On 1/22/24 12:03, Jiri Slaby (SUSE) wrote:
> Push the console code (vt.c, vt.h, console.h, ...) into a bit more
> maintainable state. Especially all around consw structure and document
> it.
>
> CSI parser is also a bit cleaned up. More to follow some time in the
> next round.

I've not yet looked through all of those patches, but I
tried to boot up a machine with the STI console driver
and I've not seen any issues yet.
So far:

Tested-by: Helge Deller <deller@gmx.de> # parisc STI console

Helge

> [v2] See respective patches for changes. The major changes:
>   * vesa.h introduced
>   * parameters of csi*() simplified
>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: dri-devel@lists.freedesktop.org
> Cc: Helge Deller <deller@gmx.de>
> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: linux-doc@vger.kernel.org
> Cc: linux-fbdev@vger.kernel.org
> Cc: linux-parisc@vger.kernel.org
> Cc: Martin Hostettler <textshell@uchuujin.de>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
>
> Jiri Slaby (SUSE) (47):
>
>    vgacon: inline vc_scrolldelta_helper() into vgacon_scrolldelta()
>    fbcon: make display_desc a static array in fbcon_startup()
>    tty: vt: fix 20 vs 0x20 typo in EScsiignore
>    tty: vt: expect valid vc when in tty ops
>    tty: vt: pass proper pointers from tioclinux()
>    tty: vt: push console lock from tioclinux() down to 2 functions
>    tty: vt: pass vc_resize_user as a parameter
>    tty: vt: make vc_is_sel()'s vc const
>    tty: vt: define an enum for CSI+m codes
>    tty: vt: use case ranges for CSI+m fg/bg colors
>    tty: vt: define an enum for CSI+J codes
>    tty: vt: reflow csi_J()
>    use clamp() for counts in csi_?() handlers
>    don't pass vc->vc_par[0] to csi_?() handlers
>    tty: vt: define an enum for CSI+K codes
>    tty: vt: reflow csi_K()
>    tty: vt: define an enum for ascii characters
>    tty: vt: remove extern from functions in selection.h
>    tty: vt: make consw::con_debug_*() return void
>    tty: vt: make init parameter of consw::con_init() a bool
>    tty: vt: sanitize arguments of consw::con_clear()
>    tty: vt: remove checks for count in consw::con_clear() implementations
>    tty: vt: add con_putc() helper
>    tty: vt: eliminate unneeded consw::con_putc() implementations
>    tty: vt: sanitize consw::con_putc() parameters
>    tty: vt: sanitize consw::con_putcs() parameters
>    consoles: use if instead of switch-case in consw::con_cursor()
>    fbdev/core: simplify cursor_state setting in fbcon_ops::cursor()
>    tty: vt: remove CM_* constants
>    tty: vt: make consw::con_switch() return a bool
>    tty: vt: stop using -1 for blank mode in consw::con_blank()
>    tty: vt: define a common enum for VESA blanking constants
>    tty: vt: use VESA blanking constants
>    tty: vt: use enum constants for VESA blanking modes
>    tty: vt: make types around consw::con_blank() bool
>    tty: vt: make font of consw::con_font_set() const
>    tty: vt: make consw::con_font_default()'s name const
>    tty: vt: change consw::con_set_origin() return type
>    fbcon: remove consw::con_screen_pos()
>    tty: vt: remove consw::con_screen_pos()
>    tty: vt: make types of screenpos() more consistent
>    fbcon: remove fbcon_getxy()
>    tty: vt: remove consw::con_getxy()
>    tty: vt: remove unused consw::con_flush_scrollback()
>    tty: vt: document the rest of struct consw
>    tty: vt: fix up kernel-doc
>    Documentation: add console.rst
>
>   Documentation/driver-api/tty/console.rst |  45 ++
>   Documentation/driver-api/tty/index.rst   |   1 +
>   drivers/tty/vt/selection.c               |  43 +-
>   drivers/tty/vt/vt.c                      | 645 +++++++++++------------
>   drivers/tty/vt/vt_ioctl.c                |   6 +-
>   drivers/video/console/dummycon.c         |  38 +-
>   drivers/video/console/mdacon.c           |  43 +-
>   drivers/video/console/newport_con.c      |  69 +--
>   drivers/video/console/sticon.c           |  79 ++-
>   drivers/video/console/vgacon.c           | 152 +++---
>   drivers/video/fbdev/core/bitblit.c       |  13 +-
>   drivers/video/fbdev/core/fbcon.c         | 123 ++---
>   drivers/video/fbdev/core/fbcon.h         |   4 +-
>   drivers/video/fbdev/core/fbcon_ccw.c     |  13 +-
>   drivers/video/fbdev/core/fbcon_cw.c      |  13 +-
>   drivers/video/fbdev/core/fbcon_ud.c      |  13 +-
>   drivers/video/fbdev/core/tileblit.c      |   4 +-
>   include/linux/console.h                  | 124 +++--
>   include/linux/console_struct.h           |   1 -
>   include/linux/selection.h                |  56 +-
>   include/linux/vt_kern.h                  |  12 +-
>   include/uapi/linux/fb.h                  |   8 +-
>   include/uapi/linux/vesa.h                |  18 +
>   23 files changed, 755 insertions(+), 768 deletions(-)
>   create mode 100644 Documentation/driver-api/tty/console.rst
>   create mode 100644 include/uapi/linux/vesa.h
>