linux_dsm_epyc7002/drivers/clk/rockchip
Xing Zheng 4608d96fb4 clk: rockchip: fix incorrect GATE bits for {c, g}pll_aclk_perihp_src on rk3399
Sorry to refer incorrect clock diagram, we double check it that the bits
configuration of the Xpll_aclk_perihp_src need to be fixed:
bit 1 - shows aclk_perihp_cpll_src_en
bit 0 - shows aclk_perihp_gpll_src_en

Through the testing that plug/unplug the USB ethernet cable on the RK3399 kevin board.

1. the hclk_host0 and hclk_host1 are endpoint clocks:
cpll --> G5[1] --> aclk_perihp_cpll_src --\              |--> hclk_host0
                                          | --> ... ---> |
gpll --> G5[0] --> aclk_perihp_gpll_src --/              |--> hclk_host1

2. there is no clock below the cpll_aclk_perihp_src,
   and the hclk_hostX are below the gpll_aclk_perihp_src:
    pll_cpll                              1            1   800000000          0 0
       cpll                               7           19   800000000          0 0
          cpll_aclk_perihp_src            0            0   800000000          0 0
...
    pll_gpll                              1            1   594000000          0 0
       gpll                              10           10   594000000          0 0
          gpll_aclk_perihp_src            2            2   594000000          0 0
                hclk_perihp               5            5    74250000          0 0
                   hclk_host1_arb         2            2    74250000          0 0
                   hclk_host1             2            2    74250000          0 0
                   hclk_host0_arb         2            2    74250000          0 0
                   hclk_host0             2            2    74250000          0 0

3. by default, G5[0] and G5[1] are enabled:
localhost ~ # mem r 0xff760314
0x000003e0

4. close the G5[1] (aclk_perihp_cpll_src), and plug/unplug USB ethernet cable,
   the DUT still works well:
localhost ~ # mem w 0xff760314 0xffff03e2
localhost ~ # mem r 0xff760314
0x000003e2
plug/unplug, the work statue is ok

5. close the G5[0] (aclk_perihp_gpll_src), , and plug/unplug USB ethernet cable,
   the DUT will be crashed:
localhost ~ # mem w 0xff760314 0xffff03e1
localhost ~ # mem r 0xff760314
0x000003e1
plug/unplug, the DUT is crashed

Summary:
bit 1 - shows aclk_perihp_cpll_src_en
bit 0 - shows aclk_perihp_gpll_src_en

Fixes: 3bd14ae9da ("clk: rockchip: fix incorrect parent for rk3399's {c,g}pll_aclk_perihp_src")
Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>

[here the clock-documentation in the manual was actually stating the wrong
bits and thus only Xing's testing above revealed the issue]
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-08-12 18:09:19 +02:00
..
clk-cpu.c clk: rockchip: fix cpuclk registration error handling 2016-05-30 09:40:23 +02:00
clk-inverter.c clk: rockchip: don't return NULL when registering inverter fails 2016-02-15 23:35:20 +01:00
clk-mmc-phase.c clk: rockchip: Revert "clk: rockchip: reset init state before mmc card initialization" 2016-05-30 09:40:23 +02:00
clk-pll.c clk: rockchip: drop old_rate calculation on pll rate changes 2016-05-09 16:04:39 +02:00
clk-rk3036.c clk: rockchip: release io resource when failing to init clk 2016-03-27 13:03:35 +02:00
clk-rk3188.c clk: rockchip: release io resource when failing to init clk 2016-03-27 13:03:35 +02:00
clk-rk3228.c clk: rockchip: export rk3228 MAC clocks 2016-07-01 01:50:11 +02:00
clk-rk3288.c clk: rockchip: release io resource when failing to init clk 2016-03-27 13:03:35 +02:00
clk-rk3368.c clk: rockchip: release io resource when failing to init clk 2016-03-27 13:03:35 +02:00
clk-rk3399.c clk: rockchip: fix incorrect GATE bits for {c, g}pll_aclk_perihp_src on rk3399 2016-08-12 18:09:19 +02:00
clk-rockchip.c clk: rockchip: fix function type for CLK_OF_DECLARE 2014-05-20 14:25:22 -05:00
clk.c clk: rockchip: simplify GRF handling in pll clocks 2016-05-09 16:04:15 +02:00
clk.h clk: rockchip: simplify GRF handling in pll clocks 2016-05-09 16:04:15 +02:00
Makefile clk: rockchip: add clock controller for the RK3399 2016-03-28 14:57:07 +02:00
softrst.c clk: rockchip: Make reset_control_ops const 2016-03-29 16:29:46 -07:00