This is taken from the Vivante kernel driver and seems to improve stability and performance.
Signed-off-by: Lucas Stach l.stach@pengutronix.de --- 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);