Re: [PATCH v7 7/7] drm/log: Add integer scaling support

[Thomas Zimmermann]

Hi


Am 08.11.24 um 09:10 schrieb Jocelyn Falempe:
> 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.

Can't we have larger fonts instead?

Best regards
Thomas

> Signed-off-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
> ---
>
> v5:
>   * Change scale parameter to unsigned int (Jani Nikula)
>
>   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 e6900c6b96436..4dc7be2288ab7 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 unsigned int scale = 1;
> +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;
> @@ -66,7 +72,7 @@ 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:
> @@ -86,7 +92,7 @@ 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);
>   
> @@ -106,8 +112,8 @@ 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))
> @@ -117,9 +123,10 @@ 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++;
> @@ -204,8 +211,10 @@ 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;

--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)