On Thu, Apr 9, 2015 at 7:22 AM, Valentin Rothberg valentinrothberg@gmail.com wrote:
Hi Hai,
your commit d5af49c92a8a ("drm/msm/mdp5: Enable DSI connector in msm drm driver") in today's Linux next tree adds an #ifdef with CONFIG_MSM_BUS_SCALING as condition. MSM_BUS_SCALING is not defined in Kconfig, so the code in this #ifdef block won't be compiled at its current state.
I saw some references on this Kconfig option in other files; is there a reason for the absence of MSM_BUS_SCALING?
right now, it is something that only exists in downstream kernels (for example, android device kernels).. but in those kernels it is mandatory to use, as by default the memory/bus is downclocked and the display would underflow if we did not request sufficient bandwidth.
It only exists right now in the upstream kernel to simplify backporting to various device kernels
BR, -R
I found this issue with ./scripts/checkkconfigsymbols.py by diffing yesterday's and today's next tree.
Kind regards, Valentin