From 38a3dc51852d8350b156ea909c5aa8767d71b005 Mon Sep 17 00:00:00 2001 From: "Antonino A. Daplas" Date: Tue, 8 May 2007 00:39:37 -0700 Subject: [PATCH] fbdev: fbcon: check if mode can handle new screen Check if the mode can properly display the screen. This will be needed by drivers where the capability is not constant with each mode. The function fb_set_var() will query fbcon the requirement, then it will query the driver (via a new hook fb_get_caps()) its capability. If the driver's capability cannot handle fbcon's requirement, then fb_set_var() will fail. For example, if a particular driver supports 2 modes where: mode1 = can only display 8x16 bitmaps mode2 = can display any bitmap then if current mode = mode2 and current font = 12x22 fbset /* mode1 cannot handle 12x22 */ fbset will fail Signed-off-by: Antonino Daplas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/console/fbcon.c | 42 +++++++++++++++++++++++++++++++++++ drivers/video/fbmem.c | 33 +++++++++++++++++++++++++++ include/linux/fb.h | 12 ++++++++++ 3 files changed, 87 insertions(+) diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c index 6fc3501581..34899bd7c9 100644 --- a/drivers/video/console/fbcon.c +++ b/drivers/video/console/fbcon.c @@ -3043,6 +3043,43 @@ static void fbcon_new_modelist(struct fb_info *info) } } +static void fbcon_get_requirement(struct fb_info *info, + struct fb_blit_caps *caps) +{ + struct vc_data *vc; + struct display *p; + int charcnt; + + if (caps->flags) { + int i; + + for (i = first_fb_vc; i <= last_fb_vc; i++) { + vc = vc_cons[i].d; + if (vc && vc->vc_mode == KD_TEXT) { + p = &fb_display[i]; + caps->x |= 1 << (vc->vc_font.width - 1); + caps->y |= 1 << (vc->vc_font.height - 1); + charcnt = (p->userfont) ? + FNTCHARCNT(p->fontdata) : 256; + if (caps->len < charcnt) + caps->len = charcnt; + } + } + } else { + vc = vc_cons[fg_console].d; + + if (vc && vc->vc_mode == KD_TEXT) { + p = &fb_display[fg_console]; + caps->x |= 1 << (vc->vc_font.width - 1); + caps->y |= 1 << (vc->vc_font.height - 1); + charcnt = (p->userfont) ? + FNTCHARCNT(p->fontdata) : 256; + if (caps->len < charcnt) + caps->len = charcnt; + } + } +} + static int fbcon_event_notify(struct notifier_block *self, unsigned long action, void *data) { @@ -3050,6 +3087,7 @@ static int fbcon_event_notify(struct notifier_block *self, struct fb_info *info = event->info; struct fb_videomode *mode; struct fb_con2fbmap *con2fb; + struct fb_blit_caps *caps; int ret = 0; /* @@ -3098,6 +3136,10 @@ static int fbcon_event_notify(struct notifier_block *self, case FB_EVENT_NEW_MODELIST: fbcon_new_modelist(info); break; + case FB_EVENT_GET_REQ: + caps = event->data; + fbcon_get_requirement(info, caps); + break; } done: diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c index cd1407921a..354711c84a 100644 --- a/drivers/video/fbmem.c +++ b/drivers/video/fbmem.c @@ -773,6 +773,29 @@ fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) return 0; } +static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, + u32 activate) +{ + struct fb_event event; + struct fb_blit_caps caps, fbcaps; + int err = 0; + + memset(&caps, 0, sizeof(caps)); + memset(&fbcaps, 0, sizeof(fbcaps)); + caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; + event.info = info; + event.data = ∩︀ + fb_notifier_call_chain(FB_EVENT_GET_REQ, &event); + info->fbops->fb_get_caps(info, &fbcaps, var); + + if (((fbcaps.x ^ caps.x) & caps.x) || + ((fbcaps.y ^ caps.y) & caps.y) || + (fbcaps.len < caps.len)) + err = -EINVAL; + + return err; +} + int fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) { @@ -817,7 +840,15 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) struct fb_videomode mode; int err = 0; + if (info->fbops->fb_get_caps) { + err = fb_check_caps(info, var, activate); + + if (err) + goto done; + } + info->var = *var; + if (info->fbops->fb_set_par) info->fbops->fb_set_par(info); @@ -843,6 +874,8 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) } } } + + done: return 0; } diff --git a/include/linux/fb.h b/include/linux/fb.h index a2f382c01c..dff7a72894 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -527,12 +527,20 @@ struct fb_cursor_user { #define FB_EVENT_MODE_CHANGE_ALL 0x0B /* A software display blank change occured */ #define FB_EVENT_CONBLANK 0x0C +/* Get drawing requirements */ +#define FB_EVENT_GET_REQ 0x0D struct fb_event { struct fb_info *info; void *data; }; +struct fb_blit_caps { + u32 x; + u32 y; + u32 len; + u32 flags; +}; extern int fb_register_client(struct notifier_block *nb); extern int fb_unregister_client(struct notifier_block *nb); @@ -652,6 +660,10 @@ struct fb_ops { /* restore saved state */ void (*fb_restore_state)(struct fb_info *info); + + /* get capability given var */ + void (*fb_get_caps)(struct fb_info *info, struct fb_blit_caps *caps, + struct fb_var_screeninfo *var); }; #ifdef CONFIG_FB_TILEBLITTING -- 2.39.5