Repeatedly enabling and disabling the display currently can lead to a state in which the IPU doesn't produce a valid signal anymore because we disable IPU submodules before they can finish their interaction.
This series reorders the enable/disable sequence so that we first wait for the DC/DP to finish processing the current frame, then stop the DI and IDMAC, and only then disable clocks to the submodules. Also from now on we disable the DC when it is not in use.
regards Philipp
Philipp Zabel (7): imx-drm: ipu-common: add ipu_map_irq to request non-IDMAC interrupts imx-drm: ipu-common: Add helpers to check for a busy IDMAC channel and to busywait for an interrupt imx-drm: ipu-dmfc: Wait for FIFOs to run empty before disabling imx-drm: ipu-dc: Wait for DC_FC_1 / DP_SF_END interrupt imx-drm: ipu-dp: Split disabling the DP foreground channel from disabling the DP module imx-drm: imx-dp: When disabling the DP foreground channel, wait until the DP background channel is finished before disabling the IDMAC channel imx-drm: ipuv3-crtc: Change display enable/disable order
drivers/staging/imx-drm/ipu-v3/imx-ipu-v3.h | 3 ++ drivers/staging/imx-drm/ipu-v3/ipu-common.c | 41 ++++++++++++++--- drivers/staging/imx-drm/ipu-v3/ipu-dc.c | 71 ++++++++++++++++++++--------- drivers/staging/imx-drm/ipu-v3/ipu-dmfc.c | 25 +++++++++- drivers/staging/imx-drm/ipu-v3/ipu-dp.c | 71 +++++++++++++++++++---------- drivers/staging/imx-drm/ipu-v3/ipu-prv.h | 3 ++ drivers/staging/imx-drm/ipuv3-crtc.c | 10 ++-- drivers/staging/imx-drm/ipuv3-plane.c | 4 ++ 8 files changed, 173 insertions(+), 55 deletions(-)