viafb: make single framebuffer multiple adapter mode work

This patch implementes this mode (viafb_SAMM_ON set and
viafb_dual_fb not set) in a useful way for CRT and DVI devices.
The same content is shown on both devices in different video modes.
The first (primary) resolution must not be bigger than the secondary
one and determines the visible region. The same content is shown
centered on the secondary output.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

diff --git a/drivers/video/via/dvi.c b/drivers/video/via/dvi.c
index 9138e517267c1e67cfeed4db7ad111dd379eb426..3312c81e861cc6226677a401d2fa903f11450a5e 100644 (file)
--- a/drivers/video/via/dvi.c
+++ b/drivers/video/via/dvi.c
@@ -172,7 +172,8 @@ static int tmds_register_read_bytes(int index, u8 *buff, int buff_len)
 }
 
 /* DVI Set Mode */
-void viafb_dvi_set_mode(const struct fb_var_screeninfo *var, int iga)
+void viafb_dvi_set_mode(const struct fb_var_screeninfo *var,
+       u16 cxres, u16 cyres, int iga)
 {
        struct fb_var_screeninfo dvi_var = *var;
        struct crt_mode_table *rb_mode;
@@ -185,7 +186,7 @@ void viafb_dvi_set_mode(const struct fb_var_screeninfo *var, int iga)
                        viafb_fill_var_timing_info(&dvi_var, rb_mode);
        }
 
-       viafb_fill_crtc_timing(&dvi_var, iga);
+       viafb_fill_crtc_timing(&dvi_var, cxres, cyres, iga);
 }
 
 /* Sense DVI Connector */

diff --git a/drivers/video/via/dvi.h b/drivers/video/via/dvi.h
index e2116aaf797a23973c91baefaf837dfe14828935..db757850c2167228ab315a10321aec7ef0db8291 100644 (file)
--- a/drivers/video/via/dvi.h
+++ b/drivers/video/via/dvi.h
@@ -59,6 +59,7 @@ void viafb_dvi_enable(void);
 bool __devinit viafb_tmds_trasmitter_identify(void);
 void __devinit viafb_init_dvi_size(struct tmds_chip_information *tmds_chip,
        struct tmds_setting_information *tmds_setting);
-void viafb_dvi_set_mode(const struct fb_var_screeninfo *var, int iga);
+void viafb_dvi_set_mode(const struct fb_var_screeninfo *var,
+       u16 cxres, u16 cyres, int iga);
 
 #endif /* __DVI_H__ */

diff --git a/drivers/video/via/hw.c b/drivers/video/via/hw.c
index 399d50754c435180e1c8dbb42a76ebd8fc941568..e8725c5235c8f0cc9d1d29fc27cc13e7fda861a3 100644 (file)
--- a/drivers/video/via/hw.c
+++ b/drivers/video/via/hw.c
@@ -1467,28 +1467,31 @@ void viafb_set_vclock(u32 clk, int set_iga)
        via_write_misc_reg_mask(0x0C, 0x0C); /* select external clock */
 }
 
-static struct display_timing var_to_timing(const struct fb_var_screeninfo *var)
+static struct display_timing var_to_timing(const struct fb_var_screeninfo *var, u16 cxres, u16 cyres)
 {
        struct display_timing timing;
+       u16 dx = (var->xres - cxres) / 2, dy = (var->yres - cyres) / 2;
 
-       timing.hor_addr = var->xres;
-       timing.hor_sync_start = timing.hor_addr + var->right_margin;
+       timing.hor_addr = cxres;
+       timing.hor_sync_start = timing.hor_addr + var->right_margin + dx;
        timing.hor_sync_end = timing.hor_sync_start + var->hsync_len;
-       timing.hor_total = timing.hor_sync_end + var->left_margin;
-       timing.hor_blank_start = timing.hor_addr;
-       timing.hor_blank_end = timing.hor_total;
-       timing.ver_addr = var->yres;
-       timing.ver_sync_start = timing.ver_addr + var->lower_margin;
+       timing.hor_total = timing.hor_sync_end + var->left_margin + dx;
+       timing.hor_blank_start = timing.hor_addr + dx;
+       timing.hor_blank_end = timing.hor_total - dy;
+       timing.ver_addr = cyres;
+       timing.ver_sync_start = timing.ver_addr + var->lower_margin + dy;
        timing.ver_sync_end = timing.ver_sync_start + var->vsync_len;
-       timing.ver_total = timing.ver_sync_end + var->upper_margin;
-       timing.ver_blank_start = timing.ver_addr;
-       timing.ver_blank_end = timing.ver_total;
+       timing.ver_total = timing.ver_sync_end + var->upper_margin + dy;
+       timing.ver_blank_start = timing.ver_addr + dy;
+       timing.ver_blank_end = timing.ver_total - dy;
        return timing;
 }
 
-void viafb_fill_crtc_timing(const struct fb_var_screeninfo *var, int iga)
+void viafb_fill_crtc_timing(const struct fb_var_screeninfo *var,
+       u16 cxres, u16 cyres, int iga)
 {
-       struct display_timing crt_reg = var_to_timing(var);
+       struct display_timing crt_reg = var_to_timing(var,
+               cxres ? cxres : var->xres, cyres ? cyres : var->yres);
 
        if (iga == IGA1)
                via_set_primary_timing(&crt_reg);
@@ -1842,7 +1845,7 @@ static void hw_init(void)
 
 int viafb_setmode(int video_bpp, int video_bpp1)
 {
-       int j;
+       int j, cxres = 0, cyres = 0;
        int port;
        u32 devices = viaparinfo->shared->iga1_devices
                | viaparinfo->shared->iga2_devices;
@@ -1891,6 +1894,8 @@ int viafb_setmode(int video_bpp, int video_bpp1)
        } else if (viafb_SAMM_ON) {
                viafb_fill_var_timing_info(&var2, viafb_get_best_mode(
                        viafb_second_xres, viafb_second_yres, viafb_refresh1));
+               cxres = viafbinfo->var.xres;
+               cyres = viafbinfo->var.yres;
                var2.bits_per_pixel = viafbinfo->var.bits_per_pixel;
        }
 
@@ -1898,9 +1903,9 @@ int viafb_setmode(int video_bpp, int video_bpp1)
        if (viafb_CRT_ON) {
                if (viaparinfo->shared->iga2_devices & VIA_CRT
                        && viafb_SAMM_ON)
-                       viafb_fill_crtc_timing(&var2, IGA2);
+                       viafb_fill_crtc_timing(&var2, cxres, cyres, IGA2);
                else
-                       viafb_fill_crtc_timing(&viafbinfo->var,
+                       viafb_fill_crtc_timing(&viafbinfo->var, 0, 0,
                                (viaparinfo->shared->iga1_devices & VIA_CRT)
                                ? IGA1 : IGA2);
 
@@ -1918,9 +1923,9 @@ int viafb_setmode(int video_bpp, int video_bpp1)
        if (viafb_DVI_ON) {
                if (viaparinfo->shared->tmds_setting_info.iga_path == IGA2
                        && viafb_SAMM_ON)
-                       viafb_dvi_set_mode(&var2, IGA2);
+                       viafb_dvi_set_mode(&var2, cxres, cyres, IGA2);
                else
-                       viafb_dvi_set_mode(&viafbinfo->var,
+                       viafb_dvi_set_mode(&viafbinfo->var, 0, 0,
                                viaparinfo->tmds_setting_info->iga_path);
        }
 

diff --git a/drivers/video/via/hw.h b/drivers/video/via/hw.h
index 4db5b6e8d8d092cfe4ad59f922010552277d40a0..f8129e49aa2c1dae9f27072c59ab3075bce858a1 100644 (file)
--- a/drivers/video/via/hw.h
+++ b/drivers/video/via/hw.h
@@ -637,7 +637,8 @@ extern int viafb_LCD_ON;
 extern int viafb_DVI_ON;
 extern int viafb_hotplug;
 
-void viafb_fill_crtc_timing(const struct fb_var_screeninfo *var, int iga);
+void viafb_fill_crtc_timing(const struct fb_var_screeninfo *var,
+       u16 cxres, u16 cyres, int iga);
 void viafb_set_vclock(u32 CLK, int set_iga);
 void viafb_load_reg(int timing_value, int viafb_load_reg_num,
        struct io_register *reg,