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author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2010-09-03 07:20:39 +0000 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2010-09-14 17:23:39 +0900 |
commit | afe417c0355154c8b2547619771d6053b3c0aad7 (patch) | |
tree | 39c2a88283848450c0a9eee36acd71c09f918ccf /drivers/video/sh_mobile_hdmi.c | |
parent | 9289c475823b6eee1f68af2a71243d0cff126948 (diff) | |
download | kernel_samsung_tuna-afe417c0355154c8b2547619771d6053b3c0aad7.zip kernel_samsung_tuna-afe417c0355154c8b2547619771d6053b3c0aad7.tar.gz kernel_samsung_tuna-afe417c0355154c8b2547619771d6053b3c0aad7.tar.bz2 |
fbdev: sh_mobile_hdmi: support hot-plugging of different HDMI / DVI displays
With this patch hot-plugging of an HDMI or a DVI monitor can select a different
video mode and reconfigure the LCDC and HDMI controllers accordingly. Due to a
lack of a standard API to inform framebuffer users of a changed video mode, the
framebuffer configuration is preserved regardless of a specific mode, selected
for the monitor. As described in a previous patch, this leads to smaller
framebuffers being displayed on larger monitors or a part of a larger
framebuffer being displayed on a smaller resolution monitor.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video/sh_mobile_hdmi.c')
-rw-r--r-- | drivers/video/sh_mobile_hdmi.c | 203 |
1 files changed, 164 insertions, 39 deletions
diff --git a/drivers/video/sh_mobile_hdmi.c b/drivers/video/sh_mobile_hdmi.c index 2260fd7..4d6ab86 100644 --- a/drivers/video/sh_mobile_hdmi.c +++ b/drivers/video/sh_mobile_hdmi.c @@ -214,6 +214,7 @@ struct sh_hdmi { struct mutex mutex; /* Protect the info pointer */ struct delayed_work edid_work; struct fb_var_screeninfo var; + struct fb_monspecs monspec; }; static void hdmi_write(struct sh_hdmi *hdmi, u8 data, u8 reg) @@ -610,11 +611,12 @@ static void sh_hdmi_configure(struct sh_hdmi *hdmi) hdmi_write(hdmi, 0x40, HDMI_SYSTEM_CTRL); } -static void sh_hdmi_read_edid(struct sh_hdmi *hdmi) +static int sh_hdmi_read_edid(struct sh_hdmi *hdmi) { struct fb_var_screeninfo tmpvar; /* TODO: When we are ready to use EDID, use this to fill &hdmi->var */ struct fb_var_screeninfo *var = &tmpvar; + const struct fb_videomode *mode, *found = NULL; int i; u8 edid[128]; @@ -634,20 +636,84 @@ static void sh_hdmi_read_edid(struct sh_hdmi *hdmi) #ifdef DEBUG printk(KERN_CONT "\n"); #endif - fb_parse_edid(edid, var); - dev_dbg(hdmi->dev, "%u-%u-%u-%u x %u-%u-%u-%u @ %lu kHz monitor detected\n", - var->left_margin, var->xres, var->right_margin, var->hsync_len, - var->upper_margin, var->yres, var->lower_margin, var->vsync_len, - PICOS2KHZ(var->pixclock)); - - if ((hdmi->var.xres == 720 && hdmi->var.yres == 480) || - (hdmi->var.xres == 1280 && hdmi->var.yres == 720) || - (hdmi->var.xres == 1920 && hdmi->var.yres == 1080)) + + fb_edid_to_monspecs(edid, &hdmi->monspec); + + /* First look for an exact match */ + for (i = 0, mode = hdmi->monspec.modedb; i < hdmi->monspec.modedb_len; + i++, mode++) { + dev_dbg(hdmi->dev, "%u-%u-%u-%u x %u-%u-%u-%u @ %lu kHz monitor detected\n", + mode->left_margin, mode->xres, + mode->right_margin, mode->hsync_len, + mode->upper_margin, mode->yres, + mode->lower_margin, mode->vsync_len, + PICOS2KHZ(mode->pixclock)); + if (!found && hdmi->info) { + fb_videomode_to_var(var, mode); + found = fb_match_mode(var, &hdmi->info->modelist); + /* + * If an exact match found, we're good to bail out, but + * continue to print out all modes + */ + } + } + + /* + * The monitor might also work with a mode, that is smaller, than one of + * its modes, use the first (default) one for this + */ + if (!found && hdmi->info && hdmi->monspec.modedb_len) { + struct fb_modelist *modelist; + unsigned int min_err = UINT_MAX, err; + const struct fb_videomode *mon_mode = hdmi->monspec.modedb; + + list_for_each_entry(modelist, &hdmi->info->modelist, list) { + mode = &modelist->mode; + dev_dbg(hdmi->dev, "matching %ux%u to %ux%u\n", mode->xres, mode->yres, + mon_mode->xres, mon_mode->yres); + if (mode->xres <= mon_mode->xres && mode->yres <= mon_mode->yres) { + err = mon_mode->xres - mode->xres + mon_mode->yres - mode->yres; + if (!err) { + found = mode; + break; + } + if (err < min_err) { + found = mode; + min_err = err; + } + } + } + } + + /* Nothing suitable specified by the platform: use monitor's first mode */ + if (!found && hdmi->monspec.modedb_len) + found = hdmi->monspec.modedb; + + /* No valid timing info in EDID - last resort: use platform default mode */ + if (!found && hdmi->info) { + struct fb_modelist *modelist = list_entry(hdmi->info->modelist.next, + struct fb_modelist, list); + found = &modelist->mode; + } + + /* No cookie today */ + if (!found) + return -ENXIO; + + dev_dbg(hdmi->dev, "best \"%s\" %ux%u@%ups\n", found->name, + found->xres, found->yres, found->pixclock); + + if ((found->xres == 720 && found->yres == 480) || + (found->xres == 1280 && found->yres == 720) || + (found->xres == 1920 && found->yres == 1080)) hdmi->preprogrammed_mode = true; else hdmi->preprogrammed_mode = false; + fb_videomode_to_var(&hdmi->var, found); sh_hdmi_external_video_param(hdmi); + + return 0; } static irqreturn_t sh_hdmi_hotplug(int irq, void *dev_id) @@ -770,12 +836,73 @@ static void sh_hdmi_display_off(void *arg) hdmi_write(hdmi, 0x10, HDMI_SYSTEM_CTRL); } +static bool sh_hdmi_must_reconfigure(struct sh_hdmi *hdmi) +{ + struct fb_info *info = hdmi->info; + struct sh_mobile_lcdc_chan *ch = info->par; + struct fb_var_screeninfo *new_var = &hdmi->var, *old_var = &ch->display_var; + struct fb_videomode mode1, mode2; + + fb_var_to_videomode(&mode1, old_var); + fb_var_to_videomode(&mode2, new_var); + + dev_dbg(info->dev, "Old %ux%u, new %ux%u\n", + mode1.xres, mode1.yres, mode2.xres, mode2.yres); + + if (fb_mode_is_equal(&mode1, &mode2)) + return false; + + dev_dbg(info->dev, "Switching %u -> %u lines\n", + mode1.yres, mode2.yres); + *old_var = *new_var; + + return true; +} + +/** + * sh_hdmi_clk_configure() - set HDMI clock frequency and enable the clock + * @hdmi: driver context + * @pixclock: pixel clock period in picoseconds + * return: configured positive rate if successful + * 0 if couldn't set the rate, but managed to enable the clock + * negative error, if couldn't enable the clock + */ +static long sh_hdmi_clk_configure(struct sh_hdmi *hdmi, unsigned long pixclock) +{ + long rate; + int ret; + + rate = PICOS2KHZ(pixclock) * 1000; + rate = clk_round_rate(hdmi->hdmi_clk, rate); + if (rate > 0) { + ret = clk_set_rate(hdmi->hdmi_clk, rate); + if (ret < 0) { + dev_warn(hdmi->dev, "Cannot set rate %ld: %d\n", rate, ret); + rate = 0; + } else { + dev_dbg(hdmi->dev, "HDMI set frequency %lu\n", rate); + } + } else { + rate = 0; + dev_warn(hdmi->dev, "Cannot get suitable rate: %ld\n", rate); + } + + ret = clk_enable(hdmi->hdmi_clk); + if (ret < 0) { + dev_err(hdmi->dev, "Cannot enable clock: %d\n", ret); + return ret; + } + + return rate; +} + /* Hotplug interrupt occurred, read EDID */ static void sh_hdmi_edid_work_fn(struct work_struct *work) { struct sh_hdmi *hdmi = container_of(work, struct sh_hdmi, edid_work.work); struct sh_mobile_hdmi_info *pdata = hdmi->dev->platform_data; struct sh_mobile_lcdc_chan *ch; + int ret; dev_dbg(hdmi->dev, "%s(%p): begin, hotplug status %d\n", __func__, pdata->lcd_dev, hdmi->hp_state); @@ -786,9 +913,19 @@ static void sh_hdmi_edid_work_fn(struct work_struct *work) mutex_lock(&hdmi->mutex); if (hdmi->hp_state == HDMI_HOTPLUG_EDID_DONE) { - pm_runtime_get_sync(hdmi->dev); /* A device has been plugged in */ - sh_hdmi_read_edid(hdmi); + pm_runtime_get_sync(hdmi->dev); + + ret = sh_hdmi_read_edid(hdmi); + if (ret < 0) + goto out; + + /* Reconfigure the clock */ + clk_disable(hdmi->hdmi_clk); + ret = sh_hdmi_clk_configure(hdmi, hdmi->var.pixclock); + if (ret < 0) + goto out; + msleep(10); sh_hdmi_configure(hdmi); /* Switched to another (d) power-save mode */ @@ -802,18 +939,24 @@ static void sh_hdmi_edid_work_fn(struct work_struct *work) acquire_console_sem(); /* HDMI plug in */ - ch->display_var = hdmi->var; - if (hdmi->info->state != FBINFO_STATE_RUNNING) { - fb_set_suspend(hdmi->info, 0); - } else { + if (!sh_hdmi_must_reconfigure(hdmi) && + hdmi->info->state == FBINFO_STATE_RUNNING) { + /* + * First activation with the default monitor - just turn + * on, if we run a resume here, the logo disappears + */ if (lock_fb_info(hdmi->info)) { sh_hdmi_display_on(hdmi, hdmi->info); unlock_fb_info(hdmi->info); } + } else { + /* New monitor or have to wake up */ + fb_set_suspend(hdmi->info, 0); } release_console_sem(); } else { + ret = 0; if (!hdmi->info) goto out; @@ -824,9 +967,12 @@ static void sh_hdmi_edid_work_fn(struct work_struct *work) release_console_sem(); pm_runtime_put(hdmi->dev); + fb_destroy_modedb(hdmi->monspec.modedb); } out: + if (ret < 0) + hdmi->hp_state = HDMI_HOTPLUG_DISCONNECTED; mutex_unlock(&hdmi->mutex); dev_dbg(hdmi->dev, "%s(%p): end\n", __func__, pdata->lcd_dev); @@ -905,31 +1051,13 @@ static int __init sh_hdmi_probe(struct platform_device *pdev) goto egetclk; } - /* TODO: reconfigure the clock on monitor plug in */ - rate = PICOS2KHZ(pdata->lcd_chan->lcd_cfg[0].pixclock) * 1000; - - rate = clk_round_rate(hdmi->hdmi_clk, rate); + rate = sh_hdmi_clk_configure(hdmi, pdata->lcd_chan->lcd_cfg[0].pixclock); if (rate < 0) { ret = rate; - dev_err(&pdev->dev, "Cannot get suitable rate: %ld\n", rate); - goto erate; - } - - ret = clk_set_rate(hdmi->hdmi_clk, rate); - if (ret < 0) { - dev_err(&pdev->dev, "Cannot set rate %ld: %d\n", rate, ret); goto erate; } - dev_dbg(hdmi->dev, "HDMI set frequency %lu\n", rate); - - ret = clk_enable(hdmi->hdmi_clk); - if (ret < 0) { - dev_err(&pdev->dev, "Cannot enable clock: %d\n", ret); - goto eclkenable; - } - - dev_info(&pdev->dev, "Enabled HDMI clock at %luHz\n", rate); + dev_dbg(&pdev->dev, "Enabled HDMI clock at %luHz\n", rate); if (!request_mem_region(res->start, resource_size(res), dev_name(&pdev->dev))) { dev_err(&pdev->dev, "HDMI register region already claimed\n"); @@ -946,11 +1074,9 @@ static int __init sh_hdmi_probe(struct platform_device *pdev) platform_set_drvdata(pdev, hdmi); -#if 1 /* Product and revision IDs are 0 in sh-mobile version */ dev_info(&pdev->dev, "Detected HDMI controller 0x%x:0x%x\n", hdmi_read(hdmi, HDMI_PRODUCT_ID), hdmi_read(hdmi, HDMI_REVISION_ID)); -#endif /* Set up LCDC callbacks */ board_cfg = &pdata->lcd_chan->board_cfg; @@ -980,7 +1106,6 @@ emap: release_mem_region(res->start, resource_size(res)); ereqreg: clk_disable(hdmi->hdmi_clk); -eclkenable: erate: clk_put(hdmi->hdmi_clk); egetclk: |