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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
This commit is contained in:
Rayyan Ansari 2023-01-26 18:24:34 +00:00 committed by Thomas Zimmermann
parent 3524c96a12
commit 2a6d731a8f
1 changed files with 22 additions and 9 deletions
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31
drivers/gpu/drm/tiny/simpledrm.c
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@ -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;