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video: fbdev: ssd1307fb: Cache address ranges
Cache the column and page ranges, to avoid doing unneeded I2C transfers when the values haven't changed. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210727134730.3765898-6-geert@linux-m68k.org
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251e48a1db
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1 changed files with 25 additions and 2 deletions
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@ -82,6 +82,11 @@ struct ssd1307fb_par {
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struct regulator *vbat_reg;
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struct regulator *vbat_reg;
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u32 vcomh;
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u32 vcomh;
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u32 width;
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u32 width;
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/* Cached address ranges */
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u8 col_start;
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u8 col_end;
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u8 page_start;
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u8 page_end;
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};
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};
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struct ssd1307fb_array {
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struct ssd1307fb_array {
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@ -158,6 +163,9 @@ static int ssd1307fb_set_col_range(struct ssd1307fb_par *par, u8 col_start,
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u8 col_end = col_start + cols - 1;
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u8 col_end = col_start + cols - 1;
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int ret;
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int ret;
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if (col_start == par->col_start && col_end == par->col_end)
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return 0;
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE);
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE);
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if (ret < 0)
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if (ret < 0)
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return ret;
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return ret;
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@ -166,7 +174,13 @@ static int ssd1307fb_set_col_range(struct ssd1307fb_par *par, u8 col_start,
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if (ret < 0)
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if (ret < 0)
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return ret;
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return ret;
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return ssd1307fb_write_cmd(par->client, col_end);
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ret = ssd1307fb_write_cmd(par->client, col_end);
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if (ret < 0)
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return ret;
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par->col_start = col_start;
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par->col_end = col_end;
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return 0;
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}
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}
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static int ssd1307fb_set_page_range(struct ssd1307fb_par *par, u8 page_start,
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static int ssd1307fb_set_page_range(struct ssd1307fb_par *par, u8 page_start,
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@ -175,6 +189,9 @@ static int ssd1307fb_set_page_range(struct ssd1307fb_par *par, u8 page_start,
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u8 page_end = page_start + pages - 1;
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u8 page_end = page_start + pages - 1;
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int ret;
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int ret;
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if (page_start == par->page_start && page_end == par->page_end)
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return 0;
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PAGE_RANGE);
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PAGE_RANGE);
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if (ret < 0)
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if (ret < 0)
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return ret;
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return ret;
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@ -183,7 +200,13 @@ static int ssd1307fb_set_page_range(struct ssd1307fb_par *par, u8 page_start,
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if (ret < 0)
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if (ret < 0)
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return ret;
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return ret;
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return ssd1307fb_write_cmd(par->client, page_end);
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ret = ssd1307fb_write_cmd(par->client, page_end);
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if (ret < 0)
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return ret;
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par->page_start = page_start;
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par->page_end = page_end;
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return 0;
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}
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}
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static int ssd1307fb_update_rect(struct ssd1307fb_par *par, unsigned int x,
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static int ssd1307fb_update_rect(struct ssd1307fb_par *par, unsigned int x,
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