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7cbb78a99d
linux-next/drivers/clk/qcom
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AngeloGioacchino Del Regno 7cbb78a99d clk: qcom: rcg2: Stop hardcoding gfx3d pingpong parent numbers 
The function clk_gfx3d_determine_rate is selecting different PLLs
to manage the GFX3D clock source in a special way: this one needs
to be ping-pong'ed on different PLLs to ensure stability during
frequency switching (set a PLL rate, let it stabilize, switch the
RCG to the new PLL) and fast frequency transitions.

This technique is currently being used in the MSM8996 SoC and the
function was assuming that the parents were always at a specific
index in the parents list, which is TRUE, if we use this only on
the MSM8996 MMCC.
Unfortunately, MSM8996 is not the only SoC that needs to ping-pong
the graphics RCG, so choices are:
1. Make new special ops just to hardcode *again* other indexes,
   creating code duplication for (imo) no reason; or
2. Generalize this function, so that it becomes usable for a range
   of SoCs with slightly different ping-pong configuration.

In this commit, the second road was taken: define a new "special"
struct clk_rcg2_gfx3d, containing the ordered list of parents to
ping-pong the graphics clock on, and the "regular" rcg2 clock
structure in order to generalize the clk_gfx3d_determine_rate
function and make it working for other SoCs.

As for the function itself it is left with the assumption that we
need to ping-pong over three parents. The reasons for this are:
1. The initial model was MSM8996, which has 3 parents for the
   graphics clock pingpong;
2. The other example that was taken into consideration is the
   SDM630/636/660 SoC gpu clock controller, which is ping-ponging
   over two dynamic clocked and one fixed clock PLL.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Link: https://lore.kernel.org/r/20210113183817.447866-6-angelogioacchino.delregno@somainline.org
[sboyd@kernel.org: Grow some local variables, drop do_div() usage in
favor of plain division, we're not dealing with a u64 here]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2021-02-14 12:56:54 -08:00
..
a7-pll.c clk: qcom: Add A7 PLL support 2021-02-08 09:46:23 -08:00
a53-pll.c clk: qcom: Add A53 PLL support 2018-01-02 10:00:24 -08:00
apcs-msm8916.c clk: qcom: apcs-msm8916: use clk_parent_data to specify the parent 2020-01-04 23:15:47 -08:00
apcs-sdx55.c clk: qcom: Add SDX55 APCS clock controller support 2021-02-08 09:46:23 -08:00
apss-ipq6018.c clk: qcom: Fix return value check in apss_ipq6018_probe() 2020-06-29 14:15:34 -07:00
apss-ipq-pll.c clk: qcom: Add ipq apss pll driver 2020-06-22 00:21:59 -07:00
camcc-sc7180.c clk: qcom: camcc-sc7180: Use runtime PM ops instead of clk ones 2020-11-14 11:33:33 -08:00
camcc-sdm845.c clk: qcom: Add camera clock controller driver for SDM845 2018-08-30 18:27:06 -07:00
clk-alpha-pll.c clk: qcom: clk-alpha-pll: Add support for Lucid 5LPE PLL 2021-02-08 10:03:57 -08:00
clk-alpha-pll.h clk: qcom: clk-alpha-pll: Add support for Lucid 5LPE PLL 2021-02-08 10:03:57 -08:00
clk-branch.c clk: qcom: branch: Add AON clock ops 2019-04-11 13:34:21 -07:00
clk-branch.h clk: qcom: branch: Add AON clock ops 2019-04-11 13:34:21 -07:00
clk-cpu-8996.c clk: qcom: msm8996: Make symbol 'cpu_msm8996_clks' static 2020-07-20 17:40:18 -07:00
clk-hfpll.c clk: let init callback return an error code 2019-12-23 18:53:13 -08:00
clk-hfpll.h clk: qcom: Add support for High-Frequency PLLs (HFPLLs) 2018-10-17 13:14:37 -07:00
clk-krait.c clk: qcom: Add safe switch hook for krait mux clocks 2018-10-17 13:15:05 -07:00
clk-krait.h clk: qcom: Add safe switch hook for krait mux clocks 2018-10-17 13:15:05 -07:00
clk-pll.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-pll.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-rcg2.c clk: qcom: rcg2: Stop hardcoding gfx3d pingpong parent numbers 2021-02-14 12:56:54 -08:00
clk-rcg.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-rcg.h clk: qcom: rcg2: Stop hardcoding gfx3d pingpong parent numbers 2021-02-14 12:56:54 -08:00
clk-regmap-divider.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-regmap-divider.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-regmap-mux-div.c clk: qcom: Add regmap mux-div clocks support 2018-01-02 10:00:24 -08:00
clk-regmap-mux-div.h clk: qcom: Use the correct style for SPDX License Identifier 2019-05-01 13:01:13 -07:00
clk-regmap-mux.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-regmap-mux.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-regmap.c clk: qcom: Update SPDX headers for common files 2018-07-25 09:23:33 -07:00
clk-regmap.h clk: define to_clk_regmap() as inline function 2020-10-28 16:34:44 -07:00
clk-rpm.c clk: qcom: clk-rpm: add missing rpm clk for ipq806x 2020-03-13 13:56:31 -07:00
clk-rpmh.c clk: qcom: rpmhcc: Add sc8180x rpmh clocks 2021-02-08 09:52:20 -08:00
clk-smd-rpm.c clk: qcom: smd: Add support for MSM8992/4 rpm clocks 2020-07-11 09:19:24 -07:00
clk-spmi-pmic-div.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
common.c clk: qcom: Allow constant ratio freq tables for rcg 2019-11-07 13:43:19 -08:00
common.h clk: qcom: define probe by index API as common API 2019-08-08 08:20:01 -07:00
dispcc-sc7180.c clk: qcom: dispcc: Update DP clk ops for phy design 2020-09-22 11:51:08 -07:00
dispcc-sdm845.c clk: qcom: dispcc: Add support for display port clocks 2019-12-18 21:24:13 -08:00
dispcc-sm8250.c clk: qcom: dispcc-sm8250: handle MMCX power domain 2020-11-14 13:11:44 -08:00
gcc-apq8084.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-ipq806x.c ipq806x: gcc: add support for child probe 2020-07-21 00:10:21 -07:00
gcc-ipq4019.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-ipq6018.c clk: qcom: Add ipq6018 Global Clock Controller support 2020-01-09 12:42:55 -08:00
gcc-ipq8074.c clk: qcom: ipq8074: make pcie0_rchng_clk_src static 2020-09-22 11:34:33 -07:00
gcc-mdm9615.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-msm8660.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-msm8916.c clk: qcom: msm8916: Fix the address location of pll->config_reg 2020-04-21 19:45:18 -07:00
gcc-msm8939.c clk: qcom: gcc-msm8939: remove defined but not used variables 2020-09-22 11:50:23 -07:00
gcc-msm8960.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-msm8974.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-msm8994.c clk: qcom: gcc-msm8994: Add missing clocks, resets and GDSCs 2020-10-13 18:04:36 -07:00
gcc-msm8996.c clk: qcom: gcc-msm8996: Fix parent for CLKREF clocks 2020-01-06 08:55:28 -08:00
gcc-msm8998.c clk: qcom: gcc-msm8998: Fix Alpha PLL type for all GPLLs 2021-02-08 10:17:49 -08:00
gcc-qcs404.c clk: qcom: gcc: limit GPLL0_AO_OUT operating frequency 2019-12-18 22:07:52 -08:00
gcc-sc7180.c clk: qcom: gcc-sc7180: Mark the MM XO clocks to be always ON 2021-02-08 09:53:30 -08:00
gcc-sc8180x.c clk: qcom: gcc: Add global clock controller driver for SC8180x 2021-02-08 09:59:46 -08:00
gcc-sdm660.c clk: qcom: gcc-sdm660: Mark GPU CFG AHB clock as critical 2021-02-14 12:56:54 -08:00
gcc-sdm845.c clk: qcom: gcc: Make disp gpll0 branch aon for sc7180/sdm845 2020-07-21 00:44:11 -07:00
gcc-sdx55.c clk: qcom: Add GDSC support for SDX55 GCC 2020-12-07 17:00:14 -08:00
gcc-sm8150.c clk: qcom: gcc: remove unnecessary vco_table from SM8150 2020-07-24 01:51:14 -07:00
gcc-sm8250.c clk: qcom: gcc: Add global clock controller driver for SM8250 2020-03-09 15:14:57 -07:00
gcc-sm8350.c clk: qcom: gcc: Add clock driver for SM8350 2021-02-08 10:03:57 -08:00
gdsc.c clk: qcom: gdsc: Implement NO_RET_PERIPH flag 2021-02-14 12:56:54 -08:00
gdsc.h clk: qcom: gdsc: Implement NO_RET_PERIPH flag 2021-02-14 12:56:54 -08:00
gpucc-msm8998.c clk: qcom: gpucc-msm8998: Allow fabia gpupll0 rate setting 2021-02-14 12:56:54 -08:00
gpucc-sc7180.c clk: qcom: add common gdsc_gx_do_nothing_enable for gpucc drivers 2020-07-24 01:51:26 -07:00
gpucc-sdm845.c clk: qcom: add common gdsc_gx_do_nothing_enable for gpucc drivers 2020-07-24 01:51:26 -07:00
gpucc-sm8150.c clk: qcom: Add graphics clock controller driver for SM8150 2020-07-24 01:51:29 -07:00
gpucc-sm8250.c clk: qcom: Add graphics clock controller driver for SM8250 2020-07-24 01:51:32 -07:00
hfpll.c clk: qcom: hfpll: use clk_parent_data to specify the parent 2019-12-18 22:07:52 -08:00
Kconfig clk: qcom: Add SDM660 Multimedia Clock Controller (MMCC) driver 2021-02-14 12:56:54 -08:00
kpss-xcc.c clk: qcom: Add KPSS ACC/GCC driver 2018-10-17 13:14:54 -07:00
krait-cc.c clk: qcom: Add safe switch hook for krait mux clocks 2018-10-17 13:15:05 -07:00
lcc-ipq806x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
lcc-mdm9615.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
lcc-msm8960.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
lpass-gfm-sm8250.c clk: qcom: gfm-mux: fix clk mask 2021-02-08 09:50:46 -08:00
lpasscc-sdm845.c clk: qcom: define probe by index API as common API 2019-08-08 08:20:01 -07:00
lpasscorecc-sc7180.c clk: qcom: lpasscc: Introduce pm autosuspend for SC7180 2020-12-10 12:29:21 -08:00
Makefile clk: qcom: Add SDM660 Multimedia Clock Controller (MMCC) driver 2021-02-14 12:56:54 -08:00
mmcc-apq8084.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
mmcc-msm8960.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
mmcc-msm8974.c clk: qcom: mmcc8974: move gfx3d_clk_src from the mmcc to rpm 2019-12-18 21:27:44 -08:00
mmcc-msm8996.c clk: qcom: mmcc-msm8996: Properly describe GPU_GX gdsc 2020-05-14 14:23:42 -07:00
mmcc-msm8998.c clk: qcom: mmcc-msm8998: Set bimc_smmu_gdsc always on 2021-02-08 10:24:34 -08:00
mmcc-sdm660.c clk: qcom: Add SDM660 Multimedia Clock Controller (MMCC) driver 2021-02-14 12:56:54 -08:00
mss-sc7180.c clk: qcom: Add modem clock controller driver for SC7180 2020-03-20 16:28:05 -07:00
q6sstop-qcs404.c clk: qcom: Add Q6SSTOP clock controller for QCS404 2019-11-07 13:10:36 -08:00
reset.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
reset.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
turingcc-qcs404.c clk: qcom: fix QCS404 TuringCC regmap 2019-09-09 09:05:22 -07:00
videocc-sc7180.c clk: qcom: videocc: Update the clock flag for video_cc_vcodec0_core_clk 2020-02-12 15:02:44 -08:00
videocc-sdm845.c clk: qcom: Move frequency table macro to common file 2018-07-06 16:45:51 -07:00
videocc-sm8150.c clk: qcom: add video clock controller driver for SM8150 2020-10-13 18:05:04 -07:00
videocc-sm8250.c clk: qcom: videocc: Add gdsc mmcx-reg supply hook 2021-02-08 10:12:29 -08:00