diff options
Diffstat (limited to 'drivers/gpu/drm/drm_modes.c')
| -rw-r--r-- | drivers/gpu/drm/drm_modes.c | 74 |
1 files changed, 71 insertions, 3 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index 1c72208d8133..14b746f7ba97 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 mandatory Device Tree properties width-mm and height-mm + * are read and set on the display mode. + * + * 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) + return ret; + + ret = of_property_read_u32(np, "height-mm", &height_mm); + if (ret) + 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 */ @@ -788,7 +837,9 @@ EXPORT_SYMBOL(drm_mode_vrefresh); void drm_mode_get_hv_timing(const struct drm_display_mode *mode, int *hdisplay, int *vdisplay) { - struct drm_display_mode adjusted = *mode; + struct drm_display_mode adjusted; + + drm_mode_init(&adjusted, mode); drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY); *hdisplay = adjusted.crtc_hdisplay; @@ -880,7 +931,7 @@ 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) @@ -893,6 +944,23 @@ void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode * EXPORT_SYMBOL(drm_mode_copy); /** + * drm_mode_init - initialize the mode from another mode + * @dst: mode to overwrite + * @src: mode to copy + * + * Copy an existing mode into another mode, zeroing the + * list head of the destination mode. Typically used + * to guarantee the list head is not left with stack + * garbage in on-stack modes. + */ +void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src) +{ + memset(dst, 0, sizeof(*dst)); + drm_mode_copy(dst, src); +} +EXPORT_SYMBOL(drm_mode_init); + +/** * drm_mode_duplicate - allocate and duplicate an existing mode * @dev: drm_device to allocate the duplicated mode for * @mode: mode to duplicate |