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drm/etnaviv: set up initial PULSE_EATER register

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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>
This commit is contained in:
Wladimir J. van der Laan 2016-12-15 13:11:30 +01:00 committed by Lucas Stach
parent a1540a7fa4
commit e17a0ded5c
1 changed files with 34 additions and 0 deletions
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34
drivers/gpu/drm/etnaviv/etnaviv_gpu.c
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@ -546,6 +546,37 @@ void etnaviv_gpu_start_fe(struct etnaviv_gpu *gpu, u32 address, u16 prefetch)
VIVS_FE_COMMAND_CONTROL_PREFETCH(prefetch));
}
static void etnaviv_gpu_setup_pulse_eater(struct etnaviv_gpu *gpu)
{
/*
* Base value for VIVS_PM_PULSE_EATER register on models where it
* cannot be read, extracted from vivante kernel driver.
*/
u32 pulse_eater = 0x01590880;
if (etnaviv_is_model_rev(gpu, GC4000, 0x5208) ||
etnaviv_is_model_rev(gpu, GC4000, 0x5222)) {
pulse_eater |= BIT(23);
}
if (etnaviv_is_model_rev(gpu, GC1000, 0x5039) ||
etnaviv_is_model_rev(gpu, GC1000, 0x5040)) {
pulse_eater &= ~BIT(16);
pulse_eater |= BIT(17);
}
if ((gpu->identity.revision > 0x5420) &&
(gpu->identity.features & chipFeatures_PIPE_3D))
{
/* Performance fix: disable internal DFS */
pulse_eater = gpu_read(gpu, VIVS_PM_PULSE_EATER);
pulse_eater |= BIT(18);
}
gpu_write(gpu, VIVS_PM_PULSE_EATER, pulse_eater);
}
static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
{
u16 prefetch;
@ -586,6 +617,9 @@ static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
gpu_write(gpu, VIVS_MC_BUS_CONFIG, bus_config);
}
/* setup the pulse eater */
etnaviv_gpu_setup_pulse_eater(gpu);
/* setup the MMU */
etnaviv_iommu_restore(gpu);