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Message-ID: <20190501032603.GA2938@tuxbook-pro>
Date: Tue, 30 Apr 2019 20:26:03 -0700
From: Bjorn Andersson <bjorn.andersson@...aro.org>
To: Jeffrey Hugo <jhugo@...eaurora.org>
Cc: mturquette@...libre.com, sboyd@...nel.org, agross@...nel.org,
marc.w.gonzalez@...e.fr, david.brown@...aro.org,
robh+dt@...nel.org, mark.rutland@....com,
linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 3/6] clk: qcom: smd: Add XO clock for MSM8998
On Tue 30 Apr 19:26 PDT 2019, Jeffrey Hugo wrote:
> The XO clock generally feeds into other clock controllers as the parent
> for a lot of clock generators.
>
> Drop the "fake" XO clock in GCC now that it is redundant can will cause a
> namespace conflict.
>
> Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>
> ---
> drivers/clk/qcom/clk-smd-rpm.c | 24 ++++++++++++++++++++----
> drivers/clk/qcom/gcc-msm8998.c | 29 ++++++++++++-----------------
> 2 files changed, 32 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/clk/qcom/clk-smd-rpm.c b/drivers/clk/qcom/clk-smd-rpm.c
> index 22dd42a..55a622df 100644
> --- a/drivers/clk/qcom/clk-smd-rpm.c
> +++ b/drivers/clk/qcom/clk-smd-rpm.c
> @@ -68,7 +68,7 @@
> }
>
> #define __DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active, type, r_id, \
> - stat_id, r, key) \
> + stat_id, r, key, ignore_unused) \
I expect that we can revert the ignore_unused part once we have a proper
way to deal with resource handover.
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Regards,
Bjorn
> static struct clk_smd_rpm _platform##_##_active; \
> static struct clk_smd_rpm _platform##_##_name = { \
> .rpm_res_type = (type), \
> @@ -83,6 +83,7 @@
> .name = #_name, \
> .parent_names = (const char *[]){ "xo_board" }, \
> .num_parents = 1, \
> + .flags = (ignore_unused) ? CLK_IGNORE_UNUSED : 0, \
> }, \
> }; \
> static struct clk_smd_rpm _platform##_##_active = { \
> @@ -99,6 +100,7 @@
> .name = #_active, \
> .parent_names = (const char *[]){ "xo_board" }, \
> .num_parents = 1, \
> + .flags = (ignore_unused) ? CLK_IGNORE_UNUSED : 0, \
> }, \
> }
>
> @@ -108,7 +110,17 @@
>
> #define DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active, type, r_id, r) \
> __DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active, type, \
> - r_id, 0, r, QCOM_RPM_SMD_KEY_ENABLE)
> + r_id, 0, r, QCOM_RPM_SMD_KEY_ENABLE, false)
> +
> +/*
> + * Intended for XO clock where we don't want it turned off during late init
> + * if we don't have a consumer by then, but can turn it off later for deep
> + * sleep
> + */
> +#define DEFINE_CLK_SMD_RPM_BRANCH_SKIP_UNUSED(_platform, _name, _active, type,\
> + r_id, r) \
> + __DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active, type, \
> + r_id, 0, r, QCOM_RPM_SMD_KEY_ENABLE, true)
>
> #define DEFINE_CLK_SMD_RPM_QDSS(_platform, _name, _active, type, r_id) \
> __DEFINE_CLK_SMD_RPM(_platform, _name, _active, type, r_id, \
> @@ -117,12 +129,12 @@
> #define DEFINE_CLK_SMD_RPM_XO_BUFFER(_platform, _name, _active, r_id) \
> __DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active, \
> QCOM_SMD_RPM_CLK_BUF_A, r_id, 0, 1000, \
> - QCOM_RPM_KEY_SOFTWARE_ENABLE)
> + QCOM_RPM_KEY_SOFTWARE_ENABLE, false)
>
> #define DEFINE_CLK_SMD_RPM_XO_BUFFER_PINCTRL(_platform, _name, _active, r_id) \
> __DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active, \
> QCOM_SMD_RPM_CLK_BUF_A, r_id, 0, 1000, \
> - QCOM_RPM_KEY_PIN_CTRL_CLK_BUFFER_ENABLE_KEY)
> + QCOM_RPM_KEY_PIN_CTRL_CLK_BUFFER_ENABLE_KEY, false)
>
> #define to_clk_smd_rpm(_hw) container_of(_hw, struct clk_smd_rpm, hw)
>
> @@ -656,6 +668,8 @@ static int clk_smd_rpm_enable_scaling(struct qcom_smd_rpm *rpm)
> };
>
> /* msm8998 */
> +DEFINE_CLK_SMD_RPM_BRANCH_SKIP_UNUSED(msm8998, xo, xo_a, QCOM_SMD_RPM_MISC_CLK,
> + 0, 19200000);
> DEFINE_CLK_SMD_RPM(msm8998, snoc_clk, snoc_a_clk, QCOM_SMD_RPM_BUS_CLK, 1);
> DEFINE_CLK_SMD_RPM(msm8998, cnoc_clk, cnoc_a_clk, QCOM_SMD_RPM_BUS_CLK, 2);
> DEFINE_CLK_SMD_RPM(msm8998, ce1_clk, ce1_a_clk, QCOM_SMD_RPM_CE_CLK, 0);
> @@ -678,6 +692,8 @@ static int clk_smd_rpm_enable_scaling(struct qcom_smd_rpm *rpm)
> DEFINE_CLK_SMD_RPM_XO_BUFFER(msm8998, rf_clk3, rf_clk3_a, 6);
> DEFINE_CLK_SMD_RPM_XO_BUFFER_PINCTRL(msm8998, rf_clk3_pin, rf_clk3_a_pin, 6);
> static struct clk_smd_rpm *msm8998_clks[] = {
> + [RPM_SMD_XO_CLK_SRC] = &msm8998_xo,
> + [RPM_SMD_XO_A_CLK_SRC] = &msm8998_xo_a,
> [RPM_SMD_SNOC_CLK] = &msm8998_snoc_clk,
> [RPM_SMD_SNOC_A_CLK] = &msm8998_snoc_a_clk,
> [RPM_SMD_CNOC_CLK] = &msm8998_cnoc_clk,
> diff --git a/drivers/clk/qcom/gcc-msm8998.c b/drivers/clk/qcom/gcc-msm8998.c
> index 0336882..47c3163 100644
> --- a/drivers/clk/qcom/gcc-msm8998.c
> +++ b/drivers/clk/qcom/gcc-msm8998.c
> @@ -11,6 +11,7 @@
> #include <linux/of.h>
> #include <linux/of_device.h>
> #include <linux/clk-provider.h>
> +#include <linux/clk.h>
> #include <linux/regmap.h>
> #include <linux/reset-controller.h>
>
> @@ -117,17 +118,6 @@ enum {
> "core_bi_pll_test_se",
> };
>
> -static struct clk_fixed_factor xo = {
> - .mult = 1,
> - .div = 1,
> - .hw.init = &(struct clk_init_data){
> - .name = "xo",
> - .parent_names = (const char *[]){ "xo_board" },
> - .num_parents = 1,
> - .ops = &clk_fixed_factor_ops,
> - },
> -};
> -
> static struct pll_vco fabia_vco[] = {
> { 250000000, 2000000000, 0 },
> { 125000000, 1000000000, 1 },
> @@ -2959,10 +2949,6 @@ enum {
> .fast_io = true,
> };
>
> -static struct clk_hw *gcc_msm8998_hws[] = {
> - &xo.hw,
> -};
> -
> static const struct qcom_cc_desc gcc_msm8998_desc = {
> .config = &gcc_msm8998_regmap_config,
> .clks = gcc_msm8998_clocks,
> @@ -2971,14 +2957,23 @@ enum {
> .num_resets = ARRAY_SIZE(gcc_msm8998_resets),
> .gdscs = gcc_msm8998_gdscs,
> .num_gdscs = ARRAY_SIZE(gcc_msm8998_gdscs),
> - .clk_hws = gcc_msm8998_hws,
> - .num_clk_hws = ARRAY_SIZE(gcc_msm8998_hws),
> };
>
> static int gcc_msm8998_probe(struct platform_device *pdev)
> {
> struct regmap *regmap;
> int ret;
> + struct clk *xo;
> +
> + /*
> + * We must have a valid XO to continue, otherwise having a missing
> + * parent on a system critical clock like the uart core clock can
> + * result in strange bugs.
> + */
> + xo = clk_get(&pdev->dev, "xo");
> + if (IS_ERR(xo))
> + return PTR_ERR(xo);
> + clk_put(xo);
>
> regmap = qcom_cc_map(pdev, &gcc_msm8998_desc);
> if (IS_ERR(regmap))
> --
> Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc.
> Qualcomm Technologies, Inc. is a member of the
> Code Aurora Forum, a Linux Foundation Collaborative Project.
>
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