linux-kernel - [PATCH 0/3] drm: sun4i: set proper TCON0 DCLK rate in DSI mode

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Date:   Fri, 31 Mar 2023 13:02:42 +0200
From:   Roman Beranek <me@...y.cz>
To:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] drm: sun4i: set proper TCON0 DCLK rate in DSI mode 

With bpp bits per pixel transmitted over n DSI lanes, the target DCLK
rate for a given pixel clock is obtained as follows:

DCLK rate = 1/4 * bpp / n * pixel clock

Effect of this change can be observed through the rate of Vblank IRQs
which should now match refresh rate implied by set display mode. It
was verified to do so on a A64 board with a 2-lane and a 4-lane panel.

Roman Beranek (3):
  drm: sun4i: rename sun4i_dotclock to sun4i_tcon_dclk
  ARM: dts: sunxi: rename tcon's clock output
  drm: sun4i: calculate proper DCLK rate for DSI

 arch/arm/boot/dts/sun5i.dtsi                  |  2 +-
 arch/arm/boot/dts/sun8i-a23-a33.dtsi          |  2 +-
 arch/arm/boot/dts/sun8i-a83t.dtsi             |  2 +-
 arch/arm/boot/dts/sun8i-v3s.dtsi              |  2 +-
 arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi |  2 +-
 drivers/gpu/drm/sun4i/Makefile                |  2 +-
 drivers/gpu/drm/sun4i/sun4i_tcon.c            | 46 +++++++++++--------
 .../{sun4i_dotclock.c => sun4i_tcon_dclk.c}   |  2 +-
 .../{sun4i_dotclock.h => sun4i_tcon_dclk.h}   |  0
 9 files changed, 33 insertions(+), 27 deletions(-)
 rename drivers/gpu/drm/sun4i/{sun4i_dotclock.c => sun4i_tcon_dclk.c} (99%)
 rename drivers/gpu/drm/sun4i/{sun4i_dotclock.h => sun4i_tcon_dclk.h} (100%)

--
2.32.0 (Apple Git-132)