mirror of https://gitee.com/openkylin/linux.git
video: fbdev: pxafb: initial devicetree conversion
This patch brings a first support of pxa framebuffer devices to a devicetree pxa platform, as was before platform data. There are restrictions with this port, the biggest one being the lack of support of smart panels. Moreover the conversion doesn't provide a way to declare multiple framebuffer configurations with different bits per pixel, only the LCD hardware bus width is used. The patch was tested on both pxa25x, pxa27x and pxa3xx platform (namely lubbock, mainstone and zylonite). Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Robert Jarzmik
Tomi Valkeinen
parent
f3621a60b2
commit
420a488278
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@ -1885,6 +1885,8 @@ config FB_PXA
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select FB_CFB_FILLRECT
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select FB_CFB_COPYAREA
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select FB_CFB_IMAGEBLIT
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select VIDEOMODE_HELPERS if OF
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select FB_MODE_HELPERS if OF
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---help---
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Frame buffer driver for the built-in LCD controller in the Intel
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PXA2x0 processor.
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@ -55,6 +55,9 @@
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <linux/console.h>
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#include <linux/of_graph.h>
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#include <video/of_display_timing.h>
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#include <video/videomode.h>
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#include <mach/hardware.h>
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#include <asm/io.h>
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@ -2092,6 +2095,148 @@ static void pxafb_check_options(struct device *dev, struct pxafb_mach_info *inf)
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#define pxafb_check_options(...) do {} while (0)
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#endif
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#if defined(CONFIG_OF)
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static const char * const lcd_types[] = {
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"unknown", "mono-stn", "mono-dstn", "color-stn", "color-dstn",
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"color-tft", "smart-panel", NULL
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};
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static int of_get_pxafb_display(struct device *dev, struct device_node *disp,
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struct pxafb_mach_info *info, u32 bus_width)
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{
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struct display_timings *timings;
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struct videomode vm;
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int i, ret = -EINVAL;
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const char *s;
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ret = of_property_read_string(disp, "lcd-type", &s);
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if (ret)
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s = "color-tft";
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for (i = 0; lcd_types[i]; i++)
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if (!strcmp(s, lcd_types[i]))
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break;
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if (!i || !lcd_types[i]) {
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dev_err(dev, "lcd-type %s is unknown\n", s);
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return -EINVAL;
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}
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info->lcd_conn |= LCD_CONN_TYPE(i);
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info->lcd_conn |= LCD_CONN_WIDTH(bus_width);
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timings = of_get_display_timings(disp);
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if (!timings)
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goto out;
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ret = -ENOMEM;
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info->modes = kmalloc_array(timings->num_timings,
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sizeof(info->modes[0]), GFP_KERNEL);
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if (!info->modes)
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goto out;
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info->num_modes = timings->num_timings;
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for (i = 0; i < timings->num_timings; i++) {
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ret = videomode_from_timings(timings, &vm, i);
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if (ret) {
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dev_err(dev, "videomode_from_timings %d failed: %d\n",
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i, ret);
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goto out;
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}
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if (vm.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
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info->lcd_conn |= LCD_PCLK_EDGE_RISE;
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if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
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info->lcd_conn |= LCD_PCLK_EDGE_FALL;
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if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
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info->lcd_conn |= LCD_BIAS_ACTIVE_HIGH;
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if (vm.flags & DISPLAY_FLAGS_DE_LOW)
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info->lcd_conn |= LCD_BIAS_ACTIVE_LOW;
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if (vm.flags & DISPLAY_FLAGS_HSYNC_HIGH)
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info->modes[i].sync |= FB_SYNC_HOR_HIGH_ACT;
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if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH)
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info->modes[i].sync |= FB_SYNC_VERT_HIGH_ACT;
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info->modes[i].pixclock = 1000000000UL / (vm.pixelclock / 1000);
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info->modes[i].xres = vm.hactive;
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info->modes[i].yres = vm.vactive;
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info->modes[i].hsync_len = vm.hsync_len;
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info->modes[i].left_margin = vm.hback_porch;
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info->modes[i].right_margin = vm.hfront_porch;
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info->modes[i].vsync_len = vm.vsync_len;
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info->modes[i].upper_margin = vm.vback_porch;
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info->modes[i].lower_margin = vm.vfront_porch;
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}
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ret = 0;
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out:
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display_timings_release(timings);
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return ret;
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}
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static int of_get_pxafb_mode_info(struct device *dev,
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struct pxafb_mach_info *info)
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{
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struct device_node *display, *np;
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u32 bus_width;
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int ret, i;
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np = of_graph_get_next_endpoint(dev->of_node, NULL);
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if (!np) {
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dev_err(dev, "could not find endpoint\n");
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return -EINVAL;
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}
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ret = of_property_read_u32(np, "bus-width", &bus_width);
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if (ret) {
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dev_err(dev, "no bus-width specified: %d\n", ret);
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return ret;
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}
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display = of_graph_get_remote_port_parent(np);
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of_node_put(np);
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if (!display) {
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dev_err(dev, "no display defined\n");
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return -EINVAL;
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}
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ret = of_get_pxafb_display(dev, display, info, bus_width);
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of_node_put(display);
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if (ret)
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return ret;
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for (i = 0; i < info->num_modes; i++)
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info->modes[i].bpp = bus_width;
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return 0;
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}
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static struct pxafb_mach_info *of_pxafb_of_mach_info(struct device *dev)
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{
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int ret;
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struct pxafb_mach_info *info;
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if (!dev->of_node)
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return NULL;
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info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return ERR_PTR(-ENOMEM);
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ret = of_get_pxafb_mode_info(dev, info);
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if (ret) {
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kfree(info->modes);
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return ERR_PTR(ret);
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}
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/*
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* On purpose, neither lccrX registers nor video memory size can be
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* specified through device-tree, they are considered more a debug hack
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* available through command line.
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*/
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return info;
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}
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#else
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static struct pxafb_mach_info *of_pxafb_of_mach_info(struct device *dev)
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{
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return NULL;
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}
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#endif
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static int pxafb_probe(struct platform_device *dev)
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{
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struct pxafb_info *fbi;
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@ -2104,8 +2249,7 @@ static int pxafb_probe(struct platform_device *dev)
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ret = -ENOMEM;
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pdata = dev_get_platdata(&dev->dev);
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inf = devm_kmalloc(&dev->dev, sizeof(*inf), GFP_KERNEL);
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if (!inf)
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goto failed;
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if (pdata) {
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*inf = *pdata;
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inf->modes =
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@ -2117,8 +2261,9 @@ static int pxafb_probe(struct platform_device *dev)
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inf->modes[i] = pdata->modes[i];
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}
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fbi = NULL;
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if (!pdata)
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inf = of_pxafb_of_mach_info(&dev->dev);
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if (IS_ERR_OR_NULL(inf))
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goto failed;
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ret = pxafb_parse_options(&dev->dev, g_options, inf);
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@ -2313,11 +2458,20 @@ static int pxafb_remove(struct platform_device *dev)
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return 0;
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}
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static const struct of_device_id pxafb_of_dev_id[] = {
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{ .compatible = "marvell,pxa270-lcdc", },
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{ .compatible = "marvell,pxa300-lcdc", },
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{ .compatible = "marvell,pxa2xx-lcdc", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, pxafb_of_dev_id);
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static struct platform_driver pxafb_driver = {
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.probe = pxafb_probe,
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.remove = pxafb_remove,
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.driver = {
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.name = "pxa2xx-fb",
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.of_match_table = pxafb_of_dev_id,
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#ifdef CONFIG_PM
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.pm = &pxafb_pm_ops,
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#endif
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