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authorJon Hunter <jonathanh@nvidia.com>2016-02-15 12:38:11 +0000
committerThierry Reding <treding@nvidia.com>2016-04-05 15:22:51 +0200
commitbc9af23d314f5c846e66e9425b31df2815ef1763 (patch)
tree8b686783acdba347424215fc6e39857d0a1bfa6c /arch/arm/mach-tegra
parentc3ea297260b77a99a2383c1029a381d125f788fe (diff)
soc/tegra: pmc: Ensure GPU partition can be toggled on/off by PMC
For Tegra124 and Tegra210, the GPU partition cannot be toggled on and off via the APBDEV_PMC_PWRGATE_TOGGLE_0 register. For these devices, the partition is simply powered up and down via an external regulator. For these devices, there is a separate register for controlling the signal clamping of the partition and this is described in the PMC SoC data by the "has_gpu_clamp" variable. Use this variable to determine if the GPU partition can be controlled via the APBDEV_PMC_PWRGATE_TOGGLE_0 register and ensure that no one can incorrectly try to toggle the GPU partition via the APBDEV_PMC_PWRGATE_TOGGLE_0 register. Furthermore, we cannot use the APBDEV_PMC_PWRGATE_STATUS_0 register to determine if the GPU partition is powered for Tegra124 and Tegra210. However, if the GPU partition is powered, then the signal clamp for the GPU partition should be removed and so use bit 0 of the APBDEV_PMC_GPU_RG_CNTRL_0 register to determine if the clamp has been removed (bit[0] = 0) and the GPU partition is powered. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra')
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