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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Maxime Ripard <mripard@kernel.org>,
	Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	DRI Development <dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH resend 0/5] video: fbdev: ssd1307fb: Optimizations and improvements
Date: Tue, 20 Jul 2021 09:33:11 +0200	[thread overview]
Message-ID: <CAMuHMdXK5X5Zawgp=SivGQSvOi=p_PwarYUR4QikGuB+f_d6YQ@mail.gmail.com> (raw)
In-Reply-To: <YPXRMXQxCW+Agaz8@ravnborg.org>

Hi Sam,

On Mon, Jul 19, 2021 at 9:23 PM Sam Ravnborg <sam@ravnborg.org> wrote:
> On Wed, Jul 14, 2021 at 04:57:59PM +0200, Geert Uytterhoeven wrote:
> > This patch series optimizes console operations on ssd1307fb, after the
> > customary fixes and cleanups.
> >
> > Currently, each screen update triggers an I2C transfer of all screen
> > data, up to 1 KiB of data for a 128x64 display, which takes at least 20
> > ms in Fast mode.  While many displays are smaller, and thus require less
> > data to be transferred, 20 ms is still an optimistic value, as the
> > actual data transfer may be much slower, especially on bitbanged I2C
> > drivers.  After this series, the amount of data transfer is reduced, as
> > fillrect, copyarea, and imageblit only update the rectangle that
> > changed.
> >
> > This has been tested on an Adafruit FeatherWing OLED with an SSD1306
> > controller and a 128x32 OLED, connected to an OrangeCrab ECP5 FPGA board
> > running a 64 MHz VexRiscv RISC-V softcore, where it reduced the CPU
> > usage for blinking the cursor from more than 70% to ca. 10%.
> >
> > Thanks for your comments!
> >
> > Geert Uytterhoeven (5):
> >   video: fbdev: ssd1307fb: Propagate errors via
> >     ssd1307fb_update_display()
> >   video: fbdev: ssd1307fb: Simplify ssd1307fb_update_display()
> >   video: fbdev: ssd1307fb: Extract ssd1307fb_set_address_range()
> >   video: fbdev: ssd1307fb: Optimize screen updates
> >   video: fbdev: ssd1307fb: Cache address ranges
>
> A few comments left for a couple of patches.
> The remaining patches are:
> Acked-by: Sam Ravnborg <sam@ravnborg.org>

Thank you!

> Do you have commit rights to drm-misc-next?

No I have not (and I don't think I should).

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

      parent reply	other threads:[~2021-07-20  7:33 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-14 14:57 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 ` [PATCH resend 5/5] video: fbdev: ssd1307fb: Cache address ranges Geert Uytterhoeven
     [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 [this message]

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