diff options
Diffstat (limited to 'drivers/gpu/drm/drm_modes.c')
| -rw-r--r-- | drivers/gpu/drm/drm_modes.c | 53 |
1 files changed, 51 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index 1c72208d8133..3f819c7a021b 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -35,6 +35,7 @@ #include <linux/list_sort.h> #include <linux/export.h> +#include <video/of_display_timing.h> #include <video/of_videomode.h> #include <video/videomode.h> @@ -127,7 +128,7 @@ EXPORT_SYMBOL(drm_mode_probed_add); * according to the hdisplay, vdisplay, vrefresh. * It is based from the VESA(TM) Coordinated Video Timing Generator by * Graham Loveridge April 9, 2003 available at - * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls + * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls * * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c. * What I have done is to translate it by using integer calculation. @@ -727,6 +728,54 @@ int of_get_drm_display_mode(struct device_node *np, return 0; } EXPORT_SYMBOL_GPL(of_get_drm_display_mode); + +/** + * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree + * @np: device_node with the panel-timing specification + * @dmode: will be set to the return value + * @bus_flags: information about pixelclk, sync and DE polarity + * + * The Device Tree properties width-mm and height-mm will be read and set on + * the display mode if they are present. + * + * Returns: + * Zero on success, negative error code on failure. + */ +int of_get_drm_panel_display_mode(struct device_node *np, + struct drm_display_mode *dmode, u32 *bus_flags) +{ + u32 width_mm = 0, height_mm = 0; + struct display_timing timing; + struct videomode vm; + int ret; + + ret = of_get_display_timing(np, "panel-timing", &timing); + if (ret) + return ret; + + videomode_from_timing(&timing, &vm); + + memset(dmode, 0, sizeof(*dmode)); + drm_display_mode_from_videomode(&vm, dmode); + if (bus_flags) + drm_bus_flags_from_videomode(&vm, bus_flags); + + ret = of_property_read_u32(np, "width-mm", &width_mm); + if (ret && ret != -EINVAL) + return ret; + + ret = of_property_read_u32(np, "height-mm", &height_mm); + if (ret && ret != -EINVAL) + return ret; + + dmode->width_mm = width_mm; + dmode->height_mm = height_mm; + + drm_mode_debug_printmodeline(dmode); + + return 0; +} +EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode); #endif /* CONFIG_OF */ #endif /* CONFIG_VIDEOMODE_HELPERS */ @@ -880,7 +929,7 @@ EXPORT_SYMBOL(drm_mode_set_crtcinfo); * @dst: mode to overwrite * @src: mode to copy * - * Copy an existing mode into another mode, preserving the object id and + * Copy an existing mode into another mode, preserving the * list head of the destination mode. */ void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src) |