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[83.9.29.16]) by smtp.gmail.com with ESMTPSA id u7-20020ac243c7000000b004dc4d26c324sm2467479lfl.143.2023.03.08.13.35.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Mar 2023 13:35:51 -0800 (PST) From: Konrad Dybcio Date: Wed, 08 Mar 2023 22:35:25 +0100 Subject: [PATCH RFT v2 09/14] clk: qcom: smd-rpm: Add support for keepalive votes MIME-Version: 1.0 Message-Id: <20230303-topic-rpmcc_sleep-v2-9-ae80a325fe94@linaro.org> References: <20230303-topic-rpmcc_sleep-v2-0-ae80a325fe94@linaro.org> In-Reply-To: <20230303-topic-rpmcc_sleep-v2-0-ae80a325fe94@linaro.org> To: Andy Gross , Bjorn Andersson , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski Cc: linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski , devicetree@vger.kernel.org, Konrad Dybcio , Shawn Guo , Taniya Das X-Mailer: b4 0.12.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1678311334; l=3522; i=konrad.dybcio@linaro.org; s=20230215; h=from:subject:message-id; bh=PET/xgo25kPZz4y++jzQYNkadiG9KbkszadHqMCSmYo=; b=U8c6gZZepRlLHsxJCUUNeNSgs2R1pXwK8Oz0lee09UzA9sQohyMnpsOokWw2mt5ez6+UA+8waarz 1XTH+4oZBjlT8ZUcGNF9pFFN0kJ4hArj/ANRqAQUEIswdP4QS8cl X-Developer-Key: i=konrad.dybcio@linaro.org; a=ed25519; pk=iclgkYvtl2w05SSXO5EjjSYlhFKsJ+5OSZBjOkQuEms= Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Some bus clock should always have a minimum (19.2 MHz) vote cast on them, otherwise the platform will fall apart, hang and reboot. Add support for specifying which clocks should be kept alive and always keep a vote on XO_A to make sure the clock tree doesn't collapse. This removes the need to keep a maximum vote that was previously guaranteed by clk_smd_rpm_handoff. This commit is a combination of existing (not-exactly-upstream) work by Taniya Das, Shawn Guo and myself. Co-developed-by: Shawn Guo Co-developed-by: Taniya Das Signed-off-by: Konrad Dybcio --- drivers/clk/qcom/clk-smd-rpm.c | 29 +++++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-) diff --git a/drivers/clk/qcom/clk-smd-rpm.c b/drivers/clk/qcom/clk-smd-rpm.c index eb7781e5c8c1..d89918f9ae60 100644 --- a/drivers/clk/qcom/clk-smd-rpm.c +++ b/drivers/clk/qcom/clk-smd-rpm.c @@ -45,15 +45,17 @@ }, \ }; \ __DEFINE_CLK_SMD_RPM_AO_PREFIX(_prefix, _name, _active, type, \ - r_id, key, ao_flags) + r_id, key, ao_flags, false) #define __DEFINE_CLK_SMD_RPM_AO_PREFIX(_prefix, _name, _active, \ - type, r_id, key, ao_flags) \ + type, r_id, key, ao_flags, \ + _keep_alive) \ static struct clk_smd_rpm clk_smd_rpm_##_prefix##_active = { \ .rpm_res_type = (type), \ .rpm_clk_id = (r_id), \ .active_only = true, \ .rpm_key = (key), \ + .keep_alive = (_keep_alive), \ .peer = &clk_smd_rpm_##_prefix##_name, \ .rate = INT_MAX, \ .hw.init = &(struct clk_init_data){ \ @@ -170,6 +172,7 @@ struct clk_smd_rpm { const bool active_only; bool enabled; bool branch; + bool keep_alive; struct clk_smd_rpm *peer; struct clk_hw hw; unsigned long rate; @@ -198,11 +201,16 @@ static int clk_smd_rpm_handoff(struct clk_smd_rpm *r) .value = cpu_to_le32(r->branch ? 1 : INT_MAX), }; + /* Set up keepalive clocks with a minimum bus rate */ + if (r->keep_alive) + req.value = cpu_to_le32(19200); /* 19.2 MHz */ + ret = qcom_rpm_smd_write(r->rpm, QCOM_SMD_RPM_ACTIVE_STATE, r->rpm_res_type, r->rpm_clk_id, &req, sizeof(req)); if (ret) return ret; + ret = qcom_rpm_smd_write(r->rpm, QCOM_SMD_RPM_SLEEP_STATE, r->rpm_res_type, r->rpm_clk_id, &req, sizeof(req)); @@ -438,12 +446,29 @@ static int clk_smd_rpm_is_enabled(struct clk_hw *hw) return r->enabled; } +static int clk_smd_rpm_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_smd_rpm *r = to_clk_smd_rpm(hw); + + /* + * RPM resolves the rates internally. All we have to do on the kernel + * side is ensure that we don't accidentally put down the keepalive + * clocks, which could happen if they received a vote below 19.2 MHz. + */ + if (r->keep_alive) + req->rate = max(req->rate, 19200000UL); + + return 0; +} + static const struct clk_ops clk_smd_rpm_ops = { .prepare = clk_smd_rpm_prepare, .unprepare = clk_smd_rpm_unprepare, .set_rate = clk_smd_rpm_set_rate, .round_rate = clk_smd_rpm_round_rate, .recalc_rate = clk_smd_rpm_recalc_rate, + .determine_rate = clk_smd_rpm_determine_rate, .is_enabled = clk_smd_rpm_is_enabled, .is_prepared = clk_smd_rpm_is_enabled, };