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drm/etnaviv: enable GPU module level clock gating support

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Enable GPU module level hardware clock gating, using the conditions
found in the galcore v5 driver.

v2 lst: Split out clock gating enable into separate function, as
there might be more conditions needed for new hardware.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
This commit is contained in:
Russell King 2016-01-21 15:20:45 +00:00 committed by Lucas Stach
parent 33688abb28
commit 7d0c6e7115
2 changed files with 51 additions and 0 deletions
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44
drivers/gpu/drm/etnaviv/etnaviv_gpu.c
View file

@ -487,6 +487,47 @@ static int etnaviv_hw_reset(struct etnaviv_gpu *gpu)
return 0;
}
static void etnaviv_gpu_enable_mlcg(struct etnaviv_gpu *gpu)
{
u32 pmc, ppc;
/* enable clock gating */
ppc = gpu_read(gpu, VIVS_PM_POWER_CONTROLS);
ppc |= VIVS_PM_POWER_CONTROLS_ENABLE_MODULE_CLOCK_GATING;
/* Disable stall module clock gating for 4.3.0.1 and 4.3.0.2 revs */
if (gpu->identity.revision == 0x4301 ||
gpu->identity.revision == 0x4302)
ppc |= VIVS_PM_POWER_CONTROLS_DISABLE_STALL_MODULE_CLOCK_GATING;
gpu_write(gpu, VIVS_PM_POWER_CONTROLS, ppc);
pmc = gpu_read(gpu, VIVS_PM_MODULE_CONTROLS);
/* Disable PA clock gating for GC400+ except for GC420 */
if (gpu->identity.model >= chipModel_GC400 &&
gpu->identity.model != chipModel_GC420)
pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_PA;
/*
* Disable PE clock gating on revs < 5.0.0.0 when HZ is
* present without a bug fix.
*/
if (gpu->identity.revision < 0x5000 &&
gpu->identity.minor_features0 & chipMinorFeatures0_HZ &&
!(gpu->identity.minor_features1 &
chipMinorFeatures1_DISABLE_PE_GATING))
pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_PE;
if (gpu->identity.revision < 0x5422)
pmc |= BIT(15); /* Unknown bit */
pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA_HZ;
pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA_EZ;
gpu_write(gpu, VIVS_PM_MODULE_CONTROLS, pmc);
}
static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
{
u16 prefetch;
@ -506,6 +547,9 @@ static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
gpu_write(gpu, VIVS_MC_DEBUG_MEMORY, mc_memory_debug);
}
/* enable module-level clock gating */
etnaviv_gpu_enable_mlcg(gpu);
/*
* Update GPU AXI cache atttribute to "cacheable, no allocate".
* This is necessary to prevent the iMX6 SoC locking up.

7
drivers/gpu/drm/etnaviv/state_hi.xml.h
View file

@ -218,6 +218,13 @@ Copyright (C) 2015
#define VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_FE 0x00000001
#define VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_DE 0x00000002
#define VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_PE 0x00000004
#define VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_SH 0x00000008
#define VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_PA 0x00000010
#define VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_SE 0x00000020
#define VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA 0x00000040
#define VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_TX 0x00000080
#define VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA_EZ 0x00010000
#define VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA_HZ 0x00020000
#define VIVS_PM_MODULE_STATUS 0x00000108
#define VIVS_PM_MODULE_STATUS_MODULE_CLOCK_GATED_FE 0x00000001