diff options
| author | Rayyan Ansari <rayyan@ansari.sh> | 2023-01-26 21:24:34 +0300 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2023-01-31 12:38:59 +0300 |
| commit | 2a6d731a8f16192ece8e1649ca13e55d80561594 (patch) | |
| tree | 9c81e331734944ca14d63d4d4344aa6e49e34678 /drivers | |
| parent | 3524c96a121952f214271622bb372661ced86101 (diff) | |
| download | linux-2a6d731a8f16192ece8e1649ca13e55d80561594.tar.xz | |
drm/simpledrm: Allow physical width and height configuration via panel node
Parse the width-mm and height-mm devicetree properties of the panel node,
and use this to set the DRM Display Mode instead of calculating it
based on a hardcoded DPI.
Signed-off-by: Rayyan Ansari <rayyan@ansari.sh>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230126182435.70544-2-rayyan@ansari.sh
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/tiny/simpledrm.c | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c index 63881a3754f8..c38d85848af8 100644 --- a/drivers/gpu/drm/tiny/simpledrm.c +++ b/drivers/gpu/drm/tiny/simpledrm.c @@ -606,16 +606,12 @@ static const struct drm_mode_config_funcs simpledrm_mode_config_funcs = { */ static struct drm_display_mode simpledrm_mode(unsigned int width, - unsigned int height) + unsigned int height, + unsigned int width_mm, + unsigned int height_mm) { - /* - * Assume a monitor resolution of 96 dpi to - * get a somewhat reasonable screen size. - */ const struct drm_display_mode mode = { - DRM_MODE_INIT(60, width, height, - DRM_MODE_RES_MM(width, 96ul), - DRM_MODE_RES_MM(height, 96ul)) + DRM_MODE_INIT(60, width, height, width_mm, height_mm) }; return mode; @@ -629,6 +625,8 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv, struct simpledrm_device *sdev; struct drm_device *dev; int width, height, stride; + int width_mm = 0, height_mm = 0; + struct device_node *panel_node; const struct drm_format_info *format; struct resource *res, *mem = NULL; struct drm_plane *primary_plane; @@ -685,6 +683,12 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv, mem = simplefb_get_memory_of(dev, of_node); if (IS_ERR(mem)) return ERR_CAST(mem); + panel_node = of_parse_phandle(of_node, "panel", 0); + if (panel_node) { + simplefb_read_u32_of(dev, panel_node, "width-mm", &width_mm); + simplefb_read_u32_of(dev, panel_node, "height-mm", &height_mm); + of_node_put(panel_node); + } } else { drm_err(dev, "no simplefb configuration found\n"); return ERR_PTR(-ENODEV); @@ -695,7 +699,16 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv, return ERR_PTR(-EINVAL); } - sdev->mode = simpledrm_mode(width, height); + /* + * Assume a monitor resolution of 96 dpi if physical dimensions + * are not specified to get a somewhat reasonable screen size. + */ + if (!width_mm) + width_mm = DRM_MODE_RES_MM(width, 96ul); + if (!height_mm) + height_mm = DRM_MODE_RES_MM(height, 96ul); + + sdev->mode = simpledrm_mode(width, height, width_mm, height_mm); sdev->format = format; sdev->pitch = stride; |