From: Konrad Dybcio <konrad.dybcio@linaro.org>
To: Andy Gross <agross@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>,
Georgi Djakov <djakov@kernel.org>, Leo Yan <leo.yan@linaro.org>,
Evan Green <evgreen@chromium.org>
Cc: Marijn Suijten <marijn.suijten@somainline.org>,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-clk@vger.kernel.org, linux-pm@vger.kernel.org,
Konrad Dybcio <konrad.dybcio@linaro.org>,
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
Stephan Gerhold <stephan@gerhold.net>
Subject: [PATCH v2 00/22] Restructure RPM SMD ICC
Date: Fri, 09 Jun 2023 22:19:05 +0200 [thread overview]
Message-ID: <20230526-topic-smd_icc-v2-0-e5934b07d813@linaro.org> (raw)
This series reshuffles things around, moving the management of SMD RPM
bus clocks to the interconnect framework where they belong. This helps
us solve a couple of issues:
1. We can work towards unused clk cleanup of RPMCC without worrying
about it killing some NoC bus, resulting in the SoC dying.
Deasserting actually unused RPM clocks (among other things) will
let us achieve "true SoC-wide power collapse states", also known as
VDD_LOW and VDD_MIN.
2. We no longer have to keep tons of quirky bus clock ifs in the icc
driver. You either have a RPM clock and call "rpm set rate" or you
have a single non-RPM clock (like AHB_CLK_SRC) or you don't have any.
3. There's less overhead - instead of going through layers and layers of
the CCF, ratesetting comes down to calling max() and sending a single
RPM message. ICC is very very dynamic so that's a big plus.
The clocks still need to be vaguely described in the clk-smd-rpm driver,
as it gives them an initial kickoff, before actually telling RPM to
enable DVFS scaling. After RPM receives that command, all clocks that
have not been assigned a rate are considered unused and are shut down
in hardware, leading to the same issue as described in point 1.
We can consider marking them __initconst in the future, but this series
is very fat even without that..
Apart from that, it squashes a couple of bugs that really need fixing..
--- MERGING STRATEGY ---
If Stephen and Georgi agree, it would be best to take all of this through
the qcom tree, as it touches on heavily intertwined components and
introduces compile-time dependencies between icc and clk drivers.
Tested on SM6375 (OOT), MSM8998 (OOT), MSM8996.
MSM8974 conversion to common code and modernization will be handled separately.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
Changes in v2:
- Sort entries properly in "Add missing headers in icc-rpm.h"
- Fix the check for no clocks on a given provider
- Replace "Divide clk rate by src node bus width" with a proper fix
- Add "Set correct bandwidth through RPM bw req"
- Split "Add QCOM_SMD_RPM_STATE_NUM" into 2 logical changes
- Move "Separate out interconnect bus clocks" a bit later in the series
- Link to v1: https://lore.kernel.org/r/20230526-topic-smd_icc-v1-0-1bf8e6663c4e@linaro.org
---
Konrad Dybcio (22):
soc: qcom: smd-rpm: Add QCOM_SMD_RPM_STATE_NUM
soc: qcom: smd-rpm: Use tabs for defines
clk: qcom: smd-rpm: Move some RPM resources to the common header
clk: qcom: smd-rpm: Export clock scaling availability
interconnect: qcom: icc-rpm: Introduce keep_alive
interconnect: qcom: icc-rpm: Allow negative QoS offset
interconnect: qcom: Fold smd-rpm.h into icc-rpm.h
interconnect: qcom: smd-rpm: Add rpmcc handling skeleton code
interconnect: qcom: Add missing headers in icc-rpm.h
interconnect: qcom: Define RPM bus clocks
interconnect: qcom: sdm660: Hook up RPM bus clk definitions
interconnect: qcom: msm8996: Hook up RPM bus clk definitions
interconnect: qcom: qcs404: Hook up RPM bus clk definitions
interconnect: qcom: msm8939: Hook up RPM bus clk definitions
interconnect: qcom: msm8916: Hook up RPM bus clk definitions
interconnect: qcom: qcm2290: Hook up RPM bus clk definitions
interconnect: qcom: icc-rpm: Control bus rpmcc from icc
clk: qcom: smd-rpm: Separate out interconnect bus clocks
interconnect: qcom: icc-rpm: Fix bucket number
interconnect: qcom: icc-rpm: Set bandwidth on both contexts
interconnect: qcom: icc-rpm: Set correct bandwidth through RPM bw req
interconnect: qcom: icc-rpm: Fix bandwidth calculations
drivers/clk/qcom/clk-smd-rpm.c | 300 ++++++++++++-----------------
drivers/interconnect/qcom/Makefile | 2 +-
drivers/interconnect/qcom/icc-rpm-clocks.c | 66 +++++++
drivers/interconnect/qcom/icc-rpm.c | 212 ++++++++++----------
drivers/interconnect/qcom/icc-rpm.h | 55 ++++--
drivers/interconnect/qcom/msm8916.c | 4 +-
drivers/interconnect/qcom/msm8939.c | 5 +-
drivers/interconnect/qcom/msm8974.c | 2 +-
drivers/interconnect/qcom/msm8996.c | 9 +-
drivers/interconnect/qcom/qcm2290.c | 7 +-
drivers/interconnect/qcom/qcs404.c | 4 +-
drivers/interconnect/qcom/sdm660.c | 7 +-
drivers/interconnect/qcom/smd-rpm.c | 39 +++-
drivers/interconnect/qcom/smd-rpm.h | 15 --
include/linux/soc/qcom/smd-rpm.h | 22 ++-
15 files changed, 427 insertions(+), 322 deletions(-)
---
base-commit: 53ab6975c12d1ad86c599a8927e8c698b144d669
change-id: 20230526-topic-smd_icc-b8213948a5ed
Best regards,
--
Konrad Dybcio <konrad.dybcio@linaro.org>
next reply other threads:[~2023-06-09 20:19 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-09 20:19 Konrad Dybcio [this message]
2023-06-09 20:19 ` [PATCH v2 01/22] soc: qcom: smd-rpm: Add QCOM_SMD_RPM_STATE_NUM Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 02/22] soc: qcom: smd-rpm: Use tabs for defines Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 03/22] clk: qcom: smd-rpm: Move some RPM resources to the common header Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 04/22] clk: qcom: smd-rpm: Export clock scaling availability Konrad Dybcio
2023-06-10 11:35 ` Stephan Gerhold
2023-06-10 12:15 ` Konrad Dybcio
2023-06-10 18:53 ` Konrad Dybcio
2023-06-10 19:25 ` Stephan Gerhold
2023-06-10 19:39 ` Konrad Dybcio
2023-06-11 9:20 ` Stephan Gerhold
2023-06-12 12:51 ` Konrad Dybcio
2023-06-12 17:03 ` Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 05/22] interconnect: qcom: icc-rpm: Introduce keep_alive Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 06/22] interconnect: qcom: icc-rpm: Allow negative QoS offset Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 07/22] interconnect: qcom: Fold smd-rpm.h into icc-rpm.h Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 08/22] interconnect: qcom: smd-rpm: Add rpmcc handling skeleton code Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 09/22] interconnect: qcom: Add missing headers in icc-rpm.h Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 10/22] interconnect: qcom: Define RPM bus clocks Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 11/22] interconnect: qcom: sdm660: Hook up RPM bus clk definitions Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 12/22] interconnect: qcom: msm8996: " Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 13/22] interconnect: qcom: qcs404: " Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 14/22] interconnect: qcom: msm8939: " Konrad Dybcio
2023-06-10 12:02 ` Stephan Gerhold
2023-06-09 20:19 ` [PATCH v2 15/22] interconnect: qcom: msm8916: " Konrad Dybcio
2023-06-10 12:02 ` Stephan Gerhold
2023-06-09 20:19 ` [PATCH v2 16/22] interconnect: qcom: qcm2290: " Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 17/22] interconnect: qcom: icc-rpm: Control bus rpmcc from icc Konrad Dybcio
2023-06-10 11:58 ` Stephan Gerhold
2023-06-10 12:14 ` Konrad Dybcio
2023-06-10 16:20 ` Stephan Gerhold
2023-06-10 17:54 ` Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 18/22] clk: qcom: smd-rpm: Separate out interconnect bus clocks Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 19/22] interconnect: qcom: icc-rpm: Fix bucket number Konrad Dybcio
2023-06-10 17:46 ` Stephan Gerhold
2023-06-10 17:53 ` Konrad Dybcio
2023-06-09 20:19 ` [PATCH v2 20/22] interconnect: qcom: icc-rpm: Set bandwidth on both contexts Konrad Dybcio
2023-06-10 18:00 ` Stephan Gerhold
2023-06-10 18:28 ` Konrad Dybcio
2023-06-10 18:43 ` Stephan Gerhold
2023-06-09 20:19 ` [PATCH v2 21/22] interconnect: qcom: icc-rpm: Set correct bandwidth through RPM bw req Konrad Dybcio
2023-06-10 18:46 ` Stephan Gerhold
2023-06-09 20:19 ` [PATCH v2 22/22] interconnect: qcom: icc-rpm: Fix bandwidth calculations Konrad Dybcio
2023-06-10 19:06 ` Stephan Gerhold
2023-06-10 19:09 ` Konrad Dybcio
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