This is taken from the Vivante kernel driver and seems to improve
stability and performance.
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
drivers/staging/etnaviv/etnaviv_gpu.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/staging/etnaviv/etnaviv_gpu.c b/drivers/staging/etnaviv/etnaviv_gpu.c
index 810a9ec04aea..0a6c702621d8 100644
--- a/drivers/staging/etnaviv/etnaviv_gpu.c
+++ b/drivers/staging/etnaviv/etnaviv_gpu.c
@@ -433,6 +433,16 @@ static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
VIVS_HI_AXI_CONFIG_AWCACHE(2) |
VIVS_HI_AXI_CONFIG_ARCACHE(2));
+ /* GC2000 rev 5108 needs a special bus config */
+ if (gpu->identity.model == 0x2000 && gpu->identity.revision == 0x5108) {
+ u32 bus_config = gpu_read(gpu, VIVS_MC_BUS_CONFIG);
+ bus_config &= ~(VIVS_MC_BUS_CONFIG_FE_BUS_CONFIG__MASK |
+ VIVS_MC_BUS_CONFIG_TX_BUS_CONFIG__MASK);
+ bus_config |= VIVS_MC_BUS_CONFIG_FE_BUS_CONFIG(1) |
+ VIVS_MC_BUS_CONFIG_TX_BUS_CONFIG(0);
+ gpu_write(gpu, VIVS_MC_BUS_CONFIG, bus_config);
+ }
+
/* set base addresses */
gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_RA, gpu->memory_base);
gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_FE, gpu->memory_base);
--
2.1.4
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