[PATCH v2 2/2] tridentfb: Add DDC support

Ondrej Zary
2015-09-24T22:14:41Z

Add DDC support for Trident cards.

Tested on TGUI9440, TGUI9680, 3DImage 9750, Blade3D 9880 and Blade XP.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
---
drivers/video/fbdev/Kconfig | 2 +
drivers/video/fbdev/tridentfb.c | 182 +++++++++++++++++++++++++++++++++++++--
2 files changed, 179 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index 8b1d371..5d67226 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -1666,6 +1666,8 @@ config FB_TRIDENT
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
+ select FB_DDC
+ select FB_MODE_HELPERS
---help---
This is the frame buffer device driver for Trident PCI/AGP chipsets.
Supported chipset families are TGUI 9440/96XX, 3DImage, Blade3D
diff --git a/drivers/video/fbdev/tridentfb.c b/drivers/video/fbdev/tridentfb.c
index 01b43e9..8a5bbc1 100644
--- a/drivers/video/fbdev/tridentfb.c
+++ b/drivers/video/fbdev/tridentfb.c
@@ -25,6 +25,9 @@
#include <video/vga.h>
#include <video/trident.h>

+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
struct tridentfb_par {
void __iomem *io_virt; /* iospace virtual memory address */
u32 pseudo_pal[16];
@@ -40,6 +43,9 @@ struct tridentfb_par {
(struct tridentfb_par *par, const char*,
u32, u32, u32, u32, u32, u32);
unsigned char eng_oper; /* engine operation... */
+ bool ddc_registered;
+ struct i2c_adapter ddc_adapter;
+ struct i2c_algo_bit_data ddc_algo;
};

static struct fb_fix_screeninfo tridentfb_fix = {
@@ -53,7 +59,7 @@ static struct fb_fix_screeninfo tridentfb_fix = {
/* defaults which are normally overriden by user values */

/* video mode */
-static char *mode_option = "640x480-8@60";
+static char *mode_option;
static int bpp = 8;

static int noaccel;
@@ -174,6 +180,121 @@ static inline u32 readmmr(struct tridentfb_par *par, u16 r)
return fb_readl(par->io_virt + r);
}

+#define DDC_SDA_TGUI BIT(0)
+#define DDC_SCL_TGUI BIT(1)
+#define DDC_SCL_DRIVE_TGUI BIT(2)
+#define DDC_SDA_DRIVE_TGUI BIT(3)
+#define DDC_MASK_TGUI (DDC_SCL_DRIVE_TGUI | DDC_SDA_DRIVE_TGUI)
+
+static void tridentfb_ddc_setscl_tgui(void *data, int val)
+{
+ struct tridentfb_par *par = data;
+ u8 reg = vga_mm_rcrt(par->io_virt, I2C) & DDC_MASK_TGUI;
+
+ if (val)
+ reg &= ~DDC_SCL_DRIVE_TGUI; /* disable drive - don't drive hi */
+ else
+ reg |= DDC_SCL_DRIVE_TGUI; /* drive low */
+
+ vga_mm_wcrt(par->io_virt, I2C, reg);
+}
+
+static void tridentfb_ddc_setsda_tgui(void *data, int val)
+{
+ struct tridentfb_par *par = data;
+ u8 reg = vga_mm_rcrt(par->io_virt, I2C) & DDC_MASK_TGUI;
+
+ if (val)
+ reg &= ~DDC_SDA_DRIVE_TGUI; /* disable drive - don't drive hi */
+ else
+ reg |= DDC_SDA_DRIVE_TGUI; /* drive low */
+
+ vga_mm_wcrt(par->io_virt, I2C, reg);
+}
+
+static int tridentfb_ddc_getsda_tgui(void *data)
+{
+ struct tridentfb_par *par = data;
+
+ return !!(vga_mm_rcrt(par->io_virt, I2C) & DDC_SDA_TGUI);
+}
+
+#define DDC_SDA_IN BIT(0)
+#define DDC_SCL_OUT BIT(1)
+#define DDC_SDA_OUT BIT(3)
+#define DDC_SCL_IN BIT(6)
+#define DDC_MASK (DDC_SCL_OUT | DDC_SDA_OUT)
+
+static void tridentfb_ddc_setscl(void *data, int val)
+{
+ struct tridentfb_par *par = data;
+ unsigned char reg;
+
+ reg = vga_mm_rcrt(par->io_virt, I2C) & DDC_MASK;
+ if (val)
+ reg |= DDC_SCL_OUT;
+ else
+ reg &= ~DDC_SCL_OUT;
+ vga_mm_wcrt(par->io_virt, I2C, reg);
+}
+
+static void tridentfb_ddc_setsda(void *data, int val)
+{
+ struct tridentfb_par *par = data;
+ unsigned char reg;
+
+ reg = vga_mm_rcrt(par->io_virt, I2C) & DDC_MASK;
+ if (!val)
+ reg |= DDC_SDA_OUT;
+ else
+ reg &= ~DDC_SDA_OUT;
+ vga_mm_wcrt(par->io_virt, I2C, reg);
+}
+
+static int tridentfb_ddc_getscl(void *data)
+{
+ struct tridentfb_par *par = data;
+
+ return !!(vga_mm_rcrt(par->io_virt, I2C) & DDC_SCL_IN);
+}
+
+static int tridentfb_ddc_getsda(void *data)
+{
+ struct tridentfb_par *par = data;
+
+ return !!(vga_mm_rcrt(par->io_virt, I2C) & DDC_SDA_IN);
+}
+
+static int tridentfb_setup_ddc_bus(struct fb_info *info)
+{
+ struct tridentfb_par *par = info->par;
+
+ strlcpy(par->ddc_adapter.name, info->fix.id,
+ sizeof(par->ddc_adapter.name));
+ par->ddc_adapter.owner = THIS_MODULE;
+ par->ddc_adapter.class = I2C_CLASS_DDC;
+ par->ddc_adapter.algo_data = &par->ddc_algo;
+ par->ddc_adapter.dev.parent = info->device;
+ if (is_oldclock(par->chip_id)) { /* not sure if this check is OK */
+ par->ddc_algo.setsda = tridentfb_ddc_setsda_tgui;
+ par->ddc_algo.setscl = tridentfb_ddc_setscl_tgui;
+ par->ddc_algo.getsda = tridentfb_ddc_getsda_tgui;
+ /* no getscl */
+ } else {
+ par->ddc_algo.setsda = tridentfb_ddc_setsda;
+ par->ddc_algo.setscl = tridentfb_ddc_setscl;
+ par->ddc_algo.getsda = tridentfb_ddc_getsda;
+ par->ddc_algo.getscl = tridentfb_ddc_getscl;
+ }
+ par->ddc_algo.udelay = 10;
+ par->ddc_algo.timeout = 20;
+ par->ddc_algo.data = par;
+
+ i2c_set_adapdata(&par->ddc_adapter, par);
+
+ return i2c_bit_add_bus(&par->ddc_adapter);
+}
+
/*
* Blade specific acceleration.
*/
@@ -1346,6 +1467,7 @@ static int trident_pci_probe(struct pci_dev *dev,
struct tridentfb_par *default_par;
int chip3D;
int chip_id;
+ bool found = false;

err = pci_enable_device(dev);
if (err)
@@ -1499,6 +1621,7 @@ static int trident_pci_probe(struct pci_dev *dev,
info->pixmap.scan_align = 1;
info->pixmap.access_align = 32;
info->pixmap.flags = FB_PIXMAP_SYSTEM;
+ info->var.bits_per_pixel = 8;

if (default_par->image_blit) {
info->flags |= FBINFO_HWACCEL_IMAGEBLIT;
@@ -1511,11 +1634,56 @@ static int trident_pci_probe(struct pci_dev *dev,
info->pixmap.scan_align = 1;
}

- if (!fb_find_mode(&info->var, info,
- mode_option, NULL, 0, NULL, bpp)) {
- err = -EINVAL;
- goto out_unmap2;
+ if (tridentfb_setup_ddc_bus(info) == 0) {
+ u8 *edid = fb_ddc_read(&default_par->ddc_adapter);
+
+ default_par->ddc_registered = true;
+ if (edid) {
+ fb_edid_to_monspecs(edid, &info->monspecs);
+ kfree(edid);
+ if (!info->monspecs.modedb)
+ dev_err(info->device, "error getting mode database\n");
+ else {
+ const struct fb_videomode *m;
+
+ fb_videomode_to_modelist(info->monspecs.modedb,
+ info->monspecs.modedb_len,
+ &info->modelist);
+ m = fb_find_best_display(&info->monspecs,
+ &info->modelist);
+ if (m) {
+ fb_videomode_to_var(&info->var, m);
+ /* fill all other info->var's fields */
+ if (tridentfb_check_var(&info->var,
+ info) == 0)
+ found = true;
+ }
+ }
+ }
}
+
+ if (!mode_option && !found)
+ mode_option = "640x480-8@60";
+
+ /* Prepare startup mode */
+ if (mode_option) {
+ err = fb_find_mode(&info->var, info, mode_option,
+ info->monspecs.modedb,
+ info->monspecs.modedb_len,
+ NULL, info->var.bits_per_pixel);
+ if (!err || err == 4) {
+ err = -EINVAL;
+ dev_err(info->device, "mode %s not found\n",
+ mode_option);
+ fb_destroy_modedb(info->monspecs.modedb);
+ info->monspecs.modedb = NULL;
+ goto out_unmap2;
+ }
+ }
+
+ fb_destroy_modedb(info->monspecs.modedb);
+ info->monspecs.modedb = NULL;
+
err = fb_alloc_cmap(&info->cmap, 256, 0);
if (err < 0)
goto out_unmap2;
@@ -1536,6 +1704,8 @@ static int trident_pci_probe(struct pci_dev *dev,
return 0;

out_unmap2:
+ if (default_par->ddc_registered)
+ i2c_del_adapter(&default_par->ddc_adapter);
kfree(info->pixmap.addr);
if (info->screen_base)
iounmap(info->screen_base);
@@ -1555,6 +1725,8 @@ static void trident_pci_remove(struct pci_dev *dev)
struct tridentfb_par *par = info->par;

unregister_framebuffer(info);
+ if (par->ddc_registered)
+ i2c_del_adapter(&par->ddc_adapter);
iounmap(par->io_virt);
iounmap(info->screen_base);
release_mem_region(tridentfb_fix.smem_start, tridentfb_fix.smem_len);
--
Ondrej Zary