On Fri, 11 Oct 2024, Jocelyn Falempe <[email protected]> wrote:
> Add a module parameter, to increase the font size for HiDPI screen.
> Even with CONFIG_FONT_TER16x32, it can still be a bit small to read.
> In this case, adding drm_log.scale=2 to your kernel command line will
> double the character size.
>
> Signed-off-by: Jocelyn Falempe <[email protected]>
> ---
> drivers/gpu/drm/drm_log.c | 27 ++++++++++++++++++---------
> 1 file changed, 18 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_log.c b/drivers/gpu/drm/drm_log.c
> index 07d151300146..e44c10819bd0 100644
> --- a/drivers/gpu/drm/drm_log.c
> +++ b/drivers/gpu/drm/drm_log.c
> @@ -25,6 +25,10 @@ MODULE_AUTHOR("Jocelyn Falempe");
> MODULE_DESCRIPTION("DRM boot logger");
> MODULE_LICENSE("GPL");
>
> +static uint scale = 1;
Drive-by nit, please use regular types instead of sysv "uint".
BR,
Jani.
> +module_param(scale, uint, 0444);
> +MODULE_PARM_DESC(scale, "Integer scaling factor for drm_log, default is 1");
> +
> /**
> * DOC: overview
> *
> @@ -38,6 +42,8 @@ struct drm_log_scanout {
> const struct font_desc *font;
> u32 rows;
> u32 columns;
> + u32 scaled_font_h;
> + u32 scaled_font_w;
> u32 line;
> u32 format;
> u32 px_width;
> @@ -67,7 +73,7 @@ static struct drm_log *console_to_drm_log(struct console
> *con)
>
> static void drm_log_blit(struct iosys_map *dst, unsigned int dst_pitch,
> const u8 *src, unsigned int src_pitch,
> - u32 height, u32 width, u32 scale, u32 px_width, u32
> color)
> + u32 height, u32 width, u32 px_width, u32 color)
> {
> switch (px_width) {
> case 2:
> @@ -87,7 +93,7 @@ static void drm_log_blit(struct iosys_map *dst, unsigned
> int dst_pitch,
> static void drm_log_clear_line(struct drm_log_scanout *scanout, u32 line)
> {
> struct drm_framebuffer *fb = scanout->buffer->fb;
> - unsigned long height = scanout->font->height;
> + unsigned long height = scanout->scaled_font_h;
> struct iosys_map map;
> struct drm_rect r = DRM_RECT_INIT(0, line * height, fb->width, height);
>
> @@ -107,8 +113,8 @@ static void drm_log_draw_line(struct drm_log_scanout
> *scanout, const char *s,
> size_t font_pitch = DIV_ROUND_UP(font->width, 8);
> const u8 *src;
> u32 px_width = fb->format->cpp[0];
> - struct drm_rect r = DRM_RECT_INIT(0, scanout->line * font->height,
> - fb->width, (scanout->line + 1) *
> font->height);
> + struct drm_rect r = DRM_RECT_INIT(0, scanout->line *
> scanout->scaled_font_h,
> + fb->width, (scanout->line + 1) *
> scanout->scaled_font_h);
> u32 i;
>
> if (drm_client_buffer_vmap_local(scanout->buffer, &map))
> @@ -118,9 +124,10 @@ static void drm_log_draw_line(struct drm_log_scanout
> *scanout, const char *s,
> for (i = 0; i < len && i < scanout->columns; i++) {
> u32 color = (i < prefix_len) ? scanout->prefix_color :
> scanout->front_color;
> src = drm_draw_get_char_bitmap(font, s[i], font_pitch);
> - drm_log_blit(&map, fb->pitches[0], src, font_pitch,
> font->height, font->width,
> - 1, px_width, color);
> - iosys_map_incr(&map, font->width * px_width);
> + drm_log_blit(&map, fb->pitches[0], src, font_pitch,
> + scanout->scaled_font_h, scanout->scaled_font_w,
> + px_width, color);
> + iosys_map_incr(&map, scanout->scaled_font_w * px_width);
> }
>
> scanout->line++;
> @@ -205,8 +212,10 @@ static int drm_log_setup_modeset(struct drm_client_dev
> *client,
> return -ENOMEM;
> }
> mode_set->fb = scanout->buffer->fb;
> - scanout->rows = height / scanout->font->height;
> - scanout->columns = width / scanout->font->width;
> + scanout->scaled_font_h = scanout->font->height * scale;
> + scanout->scaled_font_w = scanout->font->width * scale;
> + scanout->rows = height / scanout->scaled_font_h;
> + scanout->columns = width / scanout->scaled_font_w;
> scanout->front_color = drm_draw_color_from_xrgb8888(0xffffff, format);
> scanout->prefix_color = drm_draw_color_from_xrgb8888(0x4e9a06, format);
> return 0;
--
Jani Nikula, Intel
