Chen-Yu Tsai bda8eaa6de drm: sun4i: hdmi: Remove extra HPD polling ...

The HPD sense mechanism in Allwinner's old HDMI encoder hardware is more
or less an input-only GPIO. Other GPIO-based HPD implementations
directly return the current state, instead of polling for a specific
state and returning the other if that times out.

Remove the I/O polling from sun4i_hdmi_connector_detect() and directly
return a known state based on the current reading. This also gets rid
of excessive CPU usage by kworker as reported on Stack Exchange [1] and
Armbian forums [2].

 [1] https://superuser.com/questions/1515001/debian-10-buster-on-cubietruck-with-bug-in-sun4i-drm-hdmi
 [2] https://forum.armbian.com/topic/14282-headless-systems-and-sun4i_drm_hdmi-a10a20/

Fixes: 9c5681011a ("drm/sun4i: Add HDMI support")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200629060032.24134-1-wens@kernel.org

2020-06-30 10:01:48 +02:00

..

Kconfig

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Makefile

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sun4i_backend.c

drm/sun4i: backend: Make sure we enforce the clock rate

2020-01-08 09:13:47 +01:00

sun4i_backend.h

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sun4i_crtc.c

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sun4i_crtc.h

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sun4i_dotclock.c

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sun4i_dotclock.h

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sun4i_drv.c

Merge tag 'drm-misc-fixes-2020-02-07' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

2020-02-14 12:53:00 +10:00

sun4i_drv.h

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sun4i_framebuffer.c

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sun4i_framebuffer.h

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sun4i_frontend.c

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sun4i_frontend.h

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sun4i_hdmi_ddc_clk.c

drm/sun4i: hdmi ddc clk: Fix size of m divider

2020-06-10 09:11:49 +02:00

sun4i_hdmi_enc.c

drm: sun4i: hdmi: Remove extra HPD polling

2020-06-30 10:01:48 +02:00

sun4i_hdmi_i2c.c

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sun4i_hdmi_tmds_clk.c

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sun4i_hdmi.h

drm/sun4i: hdmi ddc clk: Fix size of m divider

2020-06-10 09:11:49 +02:00

sun4i_layer.c

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sun4i_layer.h

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sun4i_lvds.c

drm/sun4i: Use simple encoder

2020-04-02 14:16:45 +02:00

sun4i_lvds.h

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sun4i_rgb.c

drm/sun4i: Use simple encoder

2020-04-02 14:16:45 +02:00

sun4i_rgb.h

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sun4i_tcon.c

drm/sun4i: tcon: Delete an error message in sun4i_tcon_init_irq()

2020-04-06 10:19:25 +02:00

sun4i_tcon.h

drm/sun4i: tcon: Support LVDS output on Allwinner A20

2020-02-20 18:25:36 +01:00

sun4i_tv.c

drm/sun4i: Use simple encoder

2020-04-02 14:16:45 +02:00

sun6i_drc.c

drm/sun4i: drc: Make sure we enforce the clock rate

2020-01-08 09:14:08 +01:00

sun6i_mipi_dsi.c

Merge tag 'drm-next-2020-06-02' of git://anongit.freedesktop.org/drm/drm

2020-06-02 15:04:15 -07:00

sun6i_mipi_dsi.h

drm/sun4i: dsi: Allow binding the host without a panel

2020-02-14 16:20:27 +01:00

sun8i_csc.c

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sun8i_csc.h

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sun8i_dw_hdmi.c

drm/sun4i: Use simple encoder

2020-04-02 14:16:45 +02:00

sun8i_dw_hdmi.h

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sun8i_hdmi_phy_clk.c

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sun8i_hdmi_phy.c

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sun8i_mixer.c

drm/sun4i: mixer: Call of_dma_configure if there's an IOMMU

2020-06-23 19:13:37 +02:00

sun8i_mixer.h

drm/sun4i: de2: Don't return de2_fmt_info struct

2020-03-24 21:13:24 +01:00

sun8i_tcon_top.c

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sun8i_tcon_top.h

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sun8i_ui_layer.c

drm/sun4i: Sort includes in VI and UI layer code

2020-03-24 21:13:35 +01:00

sun8i_ui_layer.h

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sun8i_ui_scaler.c

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sun8i_ui_scaler.h

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sun8i_vi_layer.c

drm/sun4i: Sort includes in VI and UI layer code

2020-03-24 21:13:35 +01:00

sun8i_vi_layer.h

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sun8i_vi_scaler.c

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sun8i_vi_scaler.h

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sunxi_engine.h

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