From: Geert Uytterhoeven <geert@linux-m68k.org>
To: David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Maxime Ripard <mripard@kernel.org>
Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: [PATCH resend 5/5] video: fbdev: ssd1307fb: Cache address ranges
Date: Wed, 14 Jul 2021 16:58:04 +0200 [thread overview]
Message-ID: <20210714145804.2530727-6-geert@linux-m68k.org> (raw)
In-Reply-To: <20210714145804.2530727-1-geert@linux-m68k.org>
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>
---
drivers/video/fbdev/ssd1307fb.c | 52 +++++++++++++++++++++++----------
1 file changed, 36 insertions(+), 16 deletions(-)
diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index 8e3d4be74723b9bf..23b43ce479898813 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -82,6 +82,11 @@ struct ssd1307fb_par {
struct regulator *vbat_reg;
u32 vcomh;
u32 width;
+ /* Cached address ranges */
+ u8 col_start;
+ u8 col_end;
+ u8 page_start;
+ u8 page_end;
};
struct ssd1307fb_array {
@@ -160,28 +165,43 @@ static int ssd1307fb_set_address_range(struct ssd1307fb_par *par, u8 col_start,
int ret;
/* Set column range */
- ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE);
- if (ret < 0)
- return ret;
+ if (col_start != par->col_start || col_end != par->col_end) {
+ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE);
+ if (ret < 0)
+ return ret;
- ret = ssd1307fb_write_cmd(par->client, col_start);
- if (ret < 0)
- return ret;
+ ret = ssd1307fb_write_cmd(par->client, col_start);
+ if (ret < 0)
+ return ret;
- ret = ssd1307fb_write_cmd(par->client, col_end);
- if (ret < 0)
- return ret;
+ ret = ssd1307fb_write_cmd(par->client, col_end);
+ if (ret < 0)
+ return ret;
+
+ par->col_start = col_start;
+ par->col_end = col_end;
+ }
/* Set page range */
- ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PAGE_RANGE);
- if (ret < 0)
- return ret;
+ if (page_start != par->page_start || page_end != par->page_end) {
+ ret = ssd1307fb_write_cmd(par->client,
+ SSD1307FB_SET_PAGE_RANGE);
+ if (ret < 0)
+ return ret;
- ret = ssd1307fb_write_cmd(par->client, page_start);
- if (ret < 0)
- return ret;
+ ret = ssd1307fb_write_cmd(par->client, page_start);
+ if (ret < 0)
+ return ret;
+
+ ret = ssd1307fb_write_cmd(par->client, page_end);
+ if (ret < 0)
+ return ret;
- return ssd1307fb_write_cmd(par->client, page_end);
+ par->page_start = page_start;
+ par->page_end = page_end;
+ }
+
+ return 0;
}
static int ssd1307fb_update_rect(struct ssd1307fb_par *par, unsigned int x,
--
2.25.1
next prev parent reply other threads:[~2021-07-14 14:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-14 14:57 [PATCH resend 0/5] video: fbdev: ssd1307fb: Optimizations and improvements Geert Uytterhoeven
2021-07-14 14:58 ` [PATCH resend 1/5] video: fbdev: ssd1307fb: Propagate errors via ssd1307fb_update_display() Geert Uytterhoeven
2021-07-14 14:58 ` [PATCH resend 2/5] video: fbdev: ssd1307fb: Simplify ssd1307fb_update_display() Geert Uytterhoeven
[not found] ` <YPXM8AXNje7GXf+i@ravnborg.org>
2021-07-20 7:43 ` Geert Uytterhoeven
2021-07-14 14:58 ` [PATCH resend 3/5] video: fbdev: ssd1307fb: Extract ssd1307fb_set_address_range() Geert Uytterhoeven
[not found] ` <YPXNdJNpYoPSpxSb@ravnborg.org>
2021-07-20 7:51 ` Geert Uytterhoeven
2021-07-14 14:58 ` [PATCH resend 4/5] video: fbdev: ssd1307fb: Optimize screen updates Geert Uytterhoeven
[not found] ` <YPXQnlpWUa1QaZKd@ravnborg.org>
2021-07-20 7:56 ` Geert Uytterhoeven
2021-07-20 9:16 ` Geert Uytterhoeven
2021-07-14 14:58 ` Geert Uytterhoeven [this message]
[not found] ` <YO8CT+Hcw1wfhnH5@ravnborg.org>
2021-07-15 6:54 ` [PATCH resend 0/5] video: fbdev: ssd1307fb: Optimizations and improvements Geert Uytterhoeven
2021-07-20 14:53 ` Daniel Vetter
[not found] ` <YPXRMXQxCW+Agaz8@ravnborg.org>
2021-07-20 7:33 ` Geert Uytterhoeven
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