On Fri, Jun 28, 2019 at 06:01:14PM +0200, Andrzej Pietrasiewicz wrote: > It is difficult for a user to know which of the i2c adapters is for which > drm connector. This series addresses this problem. > > The idea is to have a symbolic link in connector's sysfs directory, e.g.: > > ls -l /sys/class/drm/card0-HDMI-A-1/ddc > lrwxrwxrwx 1 root root 0 Jun 24 10:42 /sys/class/drm/card0-HDMI-A-1/ddc \ > -> ../../../../soc/13880000.i2c/i2c-2 > > The user then knows that their card0-HDMI-A-1 uses i2c-2 and can e.g. run > ddcutil: > > ddcutil -b 2 getvcp 0x10 > VCP code 0x10 (Brightness ): current value = 90, max value = 100 > > The first patch in the series adds struct i2c_adapter pointer to struct > drm_connector. If the field is used by a particular driver, then an > appropriate symbolic link is created by the generic code, which is also added > by this patch. > > The second patch is an example of how to convert a driver to this new scheme. > > v1..v2: > > - used fixed name "ddc" for the symbolic link in order to make it easy for > userspace to find the i2c adapter > > v2..v3: > > - converted as many drivers as possible. > > PATCHES 3/22-22/22 SHOULD BE CONSIDERED RFC! There's a lot more drivers than this I think (i915 is absent as an example, but there should be tons more). Why are those not possible? -Daniel > > Andrzej Pietrasiewicz (22): > drm: Include ddc adapter pointer in struct drm_connector > drm/exynos: Provide ddc symlink in connector's sysfs > drm: rockchip: Provide ddc symlink in rk3066_hdmi sysfs directory > drm: rockchip: Provide ddc symlink in inno_hdmi sysfs directory > drm/msm/hdmi: Provide ddc symlink in hdmi connector sysfs directory > drm/sun4i: hdmi: Provide ddc symlink in sun4i hdmi connector sysfs > directory > drm/mediatek: Provide ddc symlink in hdmi connector sysfs directory > drm/tegra: Provide ddc symlink in output connector sysfs directory > drm/imx: imx-ldb: Provide ddc symlink in connector's sysfs > drm/imx: imx-tve: Provide ddc symlink in connector's sysfs > drm/vc4: Provide ddc symlink in connector sysfs directory > drm: zte: Provide ddc symlink in hdmi connector sysfs directory > drm: zte: Provide ddc symlink in vga connector sysfs directory > drm/tilcdc: Provide ddc symlink in connector sysfs directory > drm: sti: Provide ddc symlink in hdmi connector sysfs directory > drm/mgag200: Provide ddc symlink in connector sysfs directory > drm/ast: Provide ddc symlink in connector sysfs directory > drm/bridge: dumb-vga-dac: Provide ddc symlink in connector sysfs > directory > drm/bridge: dw-hdmi: Provide ddc symlink in connector sysfs directory > drm/bridge: ti-tfp410: Provide ddc symlink in connector sysfs > directory > drm/amdgpu: Provide ddc symlink in connector sysfs directory > drm/radeon: Provide ddc symlink in connector sysfs directory > > .../gpu/drm/amd/amdgpu/amdgpu_connectors.c | 70 +++++++++++----- > drivers/gpu/drm/ast/ast_mode.c | 1 + > drivers/gpu/drm/bridge/dumb-vga-dac.c | 19 ++--- > drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 40 ++++----- > drivers/gpu/drm/bridge/ti-tfp410.c | 19 ++--- > drivers/gpu/drm/drm_sysfs.c | 7 ++ > drivers/gpu/drm/exynos/exynos_hdmi.c | 11 ++- > drivers/gpu/drm/imx/imx-ldb.c | 13 ++- > drivers/gpu/drm/imx/imx-tve.c | 8 +- > drivers/gpu/drm/mediatek/mtk_hdmi.c | 9 +- > drivers/gpu/drm/mgag200/mgag200_mode.c | 1 + > drivers/gpu/drm/msm/hdmi/hdmi_connector.c | 1 + > drivers/gpu/drm/radeon/radeon_connectors.c | 82 ++++++++++++++----- > drivers/gpu/drm/rockchip/inno_hdmi.c | 17 ++-- > drivers/gpu/drm/rockchip/rk3066_hdmi.c | 17 ++-- > drivers/gpu/drm/sti/sti_hdmi.c | 1 + > drivers/gpu/drm/sun4i/sun4i_hdmi.h | 1 - > drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c | 14 ++-- > drivers/gpu/drm/tegra/drm.h | 1 - > drivers/gpu/drm/tegra/output.c | 12 +-- > drivers/gpu/drm/tegra/sor.c | 6 +- > drivers/gpu/drm/tilcdc/tilcdc_tfp410.c | 1 + > drivers/gpu/drm/vc4/vc4_hdmi.c | 16 ++-- > drivers/gpu/drm/zte/zx_hdmi.c | 25 ++---- > drivers/gpu/drm/zte/zx_vga.c | 25 ++---- > include/drm/drm_connector.h | 11 +++ > 26 files changed, 252 insertions(+), 176 deletions(-) > > -- > 2.17.1 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
