video: mxsfb: get display timings from device tree

Use videomode helpers to get display timings and configurations from
device tree when platform_data is absent.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

1 files changed, 110 insertions, 12 deletions

diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c
index a89901c7f5e9..e5ceba54d22f 100644
--- a/drivers/video/mxsfb.c
+++ b/drivers/video/mxsfb.c
@@ -43,12 +43,14 @@
 #include <linux/kernel.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
+#include <video/of_display_timing.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/mxsfb.h>
+#include <video/videomode.h>
 
 #define REG_SET 4
 #define REG_CLR 8
@@ -678,6 +680,97 @@ static int mxsfb_restore_mode(struct mxsfb_info *host)
         return 0;
 }
 
+static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host)
+{
+        struct fb_info *fb_info = &host->fb_info;
+        struct fb_var_screeninfo *var = &fb_info->var;
+        struct device *dev = &host->pdev->dev;
+        struct device_node *np = host->pdev->dev.of_node;
+        struct device_node *display_np;
+        struct device_node *timings_np;
+        struct display_timings *timings;
+        u32 width;
+        int i;
+        int ret = 0;
+
+        display_np = of_parse_phandle(np, "display", 0);
+        if (!display_np) {
+                dev_err(dev, "failed to find display phandle\n");
+                return -ENOENT;
+        }
+
+        ret = of_property_read_u32(display_np, "bus-width", &width);
+        if (ret < 0) {
+                dev_err(dev, "failed to get property bus-width\n");
+                goto put_display_node;
+        }
+
+        switch (width) {
+        case 8:
+                host->ld_intf_width = STMLCDIF_8BIT;
+                break;
+        case 16:
+                host->ld_intf_width = STMLCDIF_16BIT;
+                break;
+        case 18:
+                host->ld_intf_width = STMLCDIF_18BIT;
+                break;
+        case 24:
+                host->ld_intf_width = STMLCDIF_24BIT;
+                break;
+        default:
+                dev_err(dev, "invalid bus-width value\n");
+                ret = -EINVAL;
+                goto put_display_node;
+        }
+
+        ret = of_property_read_u32(display_np, "bits-per-pixel",
+                                   &var->bits_per_pixel);
+        if (ret < 0) {
+                dev_err(dev, "failed to get property bits-per-pixel\n");
+                goto put_display_node;
+        }
+
+        timings = of_get_display_timings(display_np);
+        if (!timings) {
+                dev_err(dev, "failed to get display timings\n");
+                ret = -ENOENT;
+                goto put_display_node;
+        }
+
+        timings_np = of_find_node_by_name(display_np,
+                                          "display-timings");
+        if (!timings_np) {
+                dev_err(dev, "failed to find display-timings node\n");
+                ret = -ENOENT;
+                goto put_display_node;
+        }
+
+        for (i = 0; i < of_get_child_count(timings_np); i++) {
+                struct videomode vm;
+                struct fb_videomode fb_vm;
+
+                ret = videomode_from_timing(timings, &vm, i);
+                if (ret < 0)
+                        goto put_timings_node;
+                ret = fb_videomode_from_videomode(&vm, &fb_vm);
+                if (ret < 0)
+                        goto put_timings_node;
+
+                if (vm.data_flags & DISPLAY_FLAGS_DE_HIGH)
+                        host->sync |= MXSFB_SYNC_DATA_ENABLE_HIGH_ACT;
+                if (vm.data_flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+                        host->sync |= MXSFB_SYNC_DOTCLK_FAILING_ACT;
+                fb_add_videomode(&fb_vm, &fb_info->modelist);
+        }
+
+put_timings_node:
+        of_node_put(timings_np);
+put_display_node:
+        of_node_put(display_np);
+        return ret;
+}
+
 static int mxsfb_init_fbinfo(struct mxsfb_info *host)
 {
         struct fb_info *fb_info = &host->fb_info;
@@ -686,6 +779,7 @@ static int mxsfb_init_fbinfo(struct mxsfb_info *host)
         dma_addr_t fb_phys;
         void *fb_virt;
         unsigned fb_size;
+        int ret;
 
         fb_info->fbops = &mxsfb_ops;
         fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
@@ -695,14 +789,21 @@ static int mxsfb_init_fbinfo(struct mxsfb_info *host)
         fb_info->fix.visual = FB_VISUAL_TRUECOLOR,
         fb_info->fix.accel = FB_ACCEL_NONE;
 
-        var->bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
+        if (pdata) {
+                host->ld_intf_width = pdata->ld_intf_width;
+                var->bits_per_pixel =
+                        pdata->default_bpp ? pdata->default_bpp : 16;
+        } else {
+                ret = mxsfb_init_fbinfo_dt(host);
+                if (ret)
+                        return ret;
+        }
+
         var->nonstd = 0;
         var->activate = FB_ACTIVATE_NOW;
         var->accel_flags = 0;
         var->vmode = FB_VMODE_NONINTERLACED;
 
-        host->ld_intf_width = pdata->ld_intf_width;
-
         /* Memory allocation for framebuffer */
         fb_size = SZ_2M;
         fb_virt = alloc_pages_exact(fb_size, GFP_DMA);
@@ -765,11 +866,6 @@ static int mxsfb_probe(struct platform_device *pdev)
         if (of_id)
                 pdev->id_entry = of_id->data;
 
-        if (!pdata) {
-                dev_err(&pdev->dev, "No platformdata. Giving up\n");
-                return -ENODEV;
-        }
-
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (!res) {
                 dev_err(&pdev->dev, "Cannot get memory IO resource\n");
@@ -833,14 +929,16 @@ static int mxsfb_probe(struct platform_device *pdev)
 
         INIT_LIST_HEAD(&fb_info->modelist);
 
-        host->sync = pdata->sync;
-
         ret = mxsfb_init_fbinfo(host);
         if (ret != 0)
                 goto fb_release;
 
-        for (i = 0; i < pdata->mode_count; i++)
-                fb_add_videomode(&pdata->mode_list[i], &fb_info->modelist);
+        if (pdata) {
+                host->sync = pdata->sync;
+                for (i = 0; i < pdata->mode_count; i++)
+                        fb_add_videomode(&pdata->mode_list[i],
+                                         &fb_info->modelist);
+        }
 
         modelist = list_first_entry(&fb_info->modelist,
                         struct fb_modelist, list);