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The DDC/CI protocol involves sending a multi-byte request to the display via I2C, which is typically followed by a multi-byte response. The internal I2C controller only allows single byte reads/writes or reads of 8 sequential bytes, hence DDC/CI is not supported when the internal I2C controller is used. The I2C transfers complete without errors, however the data in the response is garbage. Abort transfers to/from slave address 0x37 (DDC) with -EOPNOTSUPP, to make it evident that the communication is failing. Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Sean Paul <sean@poorly.run> Acked-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191002124354.v2.1.I709dfec496f5f0b44a7b61dcd4937924da8d8382@changeid |
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| .. | ||
| adv7511 | ||
| analogix | ||
| synopsys | ||
| analogix-anx78xx.c | ||
| analogix-anx78xx.h | ||
| cdns-dsi.c | ||
| dumb-vga-dac.c | ||
| Kconfig | ||
| lvds-encoder.c | ||
| Makefile | ||
| megachips-stdpxxxx-ge-b850v3-fw.c | ||
| nxp-ptn3460.c | ||
| panel.c | ||
| parade-ps8622.c | ||
| sii902x.c | ||
| sii9234.c | ||
| sil-sii8620.c | ||
| sil-sii8620.h | ||
| tc358764.c | ||
| tc358767.c | ||
| thc63lvd1024.c | ||
| ti-sn65dsi86.c | ||
| ti-tfp410.c | ||