When switching to the new common i2c over aux code, I ran into problems fetching the EDID on certain DP monitors. I tracked this down to the lack of bare address packets being sent between i2c transfers. This patch set adds that functionality which brings it back inline with the old drm dpm i2c algo.
Originally, I added flags to note a bare address packet, but after review switched to sending a zero sized packet instead. Note that I'm not sure the other drivers that use these helpers currently handle zero sized packets properly. I had to fix up radeon to do so.
Alex Deucher (3): drm/radeon/dp: handle zero sized i2c over aux transactions drm/dp/i2c: send bare addresses to properly reset i2c connections drm/radeon/dp: switch to the common i2c over aux code
drivers/gpu/drm/drm_dp_helper.c | 53 +++++++----- drivers/gpu/drm/radeon/atombios_dp.c | 132 ++++++----------------------- drivers/gpu/drm/radeon/radeon_connectors.c | 44 ++-------- drivers/gpu/drm/radeon/radeon_display.c | 11 ++- drivers/gpu/drm/radeon/radeon_i2c.c | 60 +++---------- drivers/gpu/drm/radeon/radeon_mode.h | 12 +-- 6 files changed, 85 insertions(+), 227 deletions(-)