kernel/drivers/gpu/drm/tegra/sor.c, branch linux-4.17.y

BackMerge tag 'v4.15-rc8' into drm-next

2018-01-17T23:32:15Z

Linux 4.15-rc8 Daniel requested this for so the intel CI won't fall over on drm-next so often.

drm/tegra: sor: Fix hang on Tegra124 eDP

2018-01-10T12:04:58Z

The SOR0 found on Tegra124 and Tegra210 only supports eDP and LVDS and therefore has a slightly different clock tree than the SOR1 which does not support eDP, but HDMI and DP instead. Commit e1335e2f0cfc ("drm/tegra: sor: Reimplement pad clock") breaks setups with eDP because the sor->clk_out clock is uninitialized and therefore setting the parent clock (either the safe clock or either of the display PLLs) fails, which can cause hangs later on since there is no clock driving the module. Fix this by falling back to the module clock for sor->clk_out on those setups. This guarantees that the module will always be clocked by an enabled clock and hence prevents those hangs. Fixes: e1335e2f0cfc ("drm/tegra: sor: Reimplement pad clock") Reported-by: Guillaume Tucker Tested-by: Jon Hunter Signed-off-by: Thierry Reding

drm/tegra: dc: Use direct offset to plane registers

2017-12-21T13:52:34Z

Traditionally, windows were accessed indirectly, through a register selection window that required a global register to be programmed with the index of the window to access. Since the global register could be written from modesetting functions as well as the interrupt handler concurrently, accesses had to be serialized using a lock. Using direct accesses to the window registers the lock can be avoided. Signed-off-by: Thierry Reding

drm/tegra: sor: Support HDMI 2.0 modes

2017-12-13T13:36:37Z

In addition to using the SCDC helpers to enable support for scrambling for HDMI 2.0 modes, take into account the high pixel clocks when programming some of the registers. Signed-off-by: Thierry Reding

drm/tegra: sor: Add Tegra186 support

2017-12-13T13:36:36Z

The SOR found on Tegra186 is very similar to the one found on Tegra210 and earlier. However, due to some changes in the display architecture, some programming sequences have changed and some register have moved around. Signed-off-by: Thierry Reding

drm/tegra: sor: Parameterize register offsets

2017-12-13T13:16:39Z

Future Tegra generations have an increased number of display controllers that can drive individual SORs. In order to support that, the offset and layout of some registers has changed in backwards-incompatible ways. Use parameterized register offsets to support this. Signed-off-by: Thierry Reding

drm/tegra: sor: Register debugfs in ->late_register()

2017-12-13T12:42:08Z

The ->late_register() and ->early_unregister() callbacks are called at the right time to make sure userspace only accesses interfaces when it should. Move debugfs registration and unregistration to these callback functions to avoid potential races with userspace. Signed-off-by: Thierry Reding

drm/tegra: sor: Root debugfs files at the connector

2017-12-13T12:42:08Z

Rather create new files within the top-level DRM device's debugfs node, add the SOR specific files to the connector's debugfs node. This avoids the need to come up with subdirectory names and is also more intuitive. Signed-off-by: Thierry Reding

drm/tegra: sor: Move register definitions into a table

2017-12-13T12:42:06Z

After commit 932f6529139e ("drm/tegra: sor: Trace register accesses"), the debugfs register dump implementation causes excessive stack usage and can result in build warnings. To fix this, move the register definitions into a table and iterate over the table while dumping the registers to debugfs. Signed-off-by: Thierry Reding

drm/tegra: sor: Reimplement pad clock

2017-11-20T12:23:54Z

The current implementation of the pad clock isn't quite correct. This has the side-effect of being incompatible with the implementation for Tegra186 (provided by the BPMP) and therefore would require a massive change to the driver to cope with the differences. Instead, simply do what Tegra186 does and add some code to fallback to the old behaviour for existing device trees. Signed-off-by: Thierry Reding