drm/etnaviv: set up initial PULSE_EATER register
Set up the PULSE_EATER register (0x0010C) in etnaviv_gpu_hw_init. This ports three mostly undocumented model/revision-specific register overrides from the Vivante kernel driver. This is relevant as at least the "disable internal DFS" for revisions > 0x5420 has shown to have a huge impact on shader performance (sped up memory read performance by 7.5x and write performance by 1.5x) on an affected GPU. Signed-off-by: Wladimir J. van der Laan <laanwj@gmail.com> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
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@ -546,6 +546,37 @@ void etnaviv_gpu_start_fe(struct etnaviv_gpu *gpu, u32 address, u16 prefetch)
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VIVS_FE_COMMAND_CONTROL_PREFETCH(prefetch));
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VIVS_FE_COMMAND_CONTROL_PREFETCH(prefetch));
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}
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}
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static void etnaviv_gpu_setup_pulse_eater(struct etnaviv_gpu *gpu)
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{
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/*
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* Base value for VIVS_PM_PULSE_EATER register on models where it
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* cannot be read, extracted from vivante kernel driver.
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*/
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u32 pulse_eater = 0x01590880;
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if (etnaviv_is_model_rev(gpu, GC4000, 0x5208) ||
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etnaviv_is_model_rev(gpu, GC4000, 0x5222)) {
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pulse_eater |= BIT(23);
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}
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if (etnaviv_is_model_rev(gpu, GC1000, 0x5039) ||
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etnaviv_is_model_rev(gpu, GC1000, 0x5040)) {
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pulse_eater &= ~BIT(16);
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pulse_eater |= BIT(17);
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}
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if ((gpu->identity.revision > 0x5420) &&
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(gpu->identity.features & chipFeatures_PIPE_3D))
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{
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/* Performance fix: disable internal DFS */
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pulse_eater = gpu_read(gpu, VIVS_PM_PULSE_EATER);
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pulse_eater |= BIT(18);
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}
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gpu_write(gpu, VIVS_PM_PULSE_EATER, pulse_eater);
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}
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static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
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static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
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{
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{
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u16 prefetch;
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u16 prefetch;
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@ -586,6 +617,9 @@ static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
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gpu_write(gpu, VIVS_MC_BUS_CONFIG, bus_config);
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gpu_write(gpu, VIVS_MC_BUS_CONFIG, bus_config);
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}
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}
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/* setup the pulse eater */
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etnaviv_gpu_setup_pulse_eater(gpu);
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/* setup the MMU */
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/* setup the MMU */
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etnaviv_iommu_restore(gpu);
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etnaviv_iommu_restore(gpu);
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