From 1a5cd7c23cc52445fcc4e82beb343ba43103ecdc Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Thu, 21 Mar 2019 11:00:21 -0700 Subject: [PATCH] bus: ti-sysc: Enable all clocks directly during init to read revision The first thing we want to do is just read the module revision register to be able to configure the module specific quirks and configure the module registers. As the interconnect target module may not yet be properly configured and may need a reset first, we don't want to use pm_runtime_get() at this point. To read the revision register, let's just enable the all the clocks for the interconnect target module during init even if the optional clocks are not needed. That way we can read the revision register to configure the quirks needed for PM runtime. Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 50 ++++++++++++++++++++++++------------------- 1 file changed, 28 insertions(+), 22 deletions(-) diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 2e7a6c490c88..209baa84db39 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -1042,39 +1042,45 @@ static int sysc_reset(struct sysc *ddata) 100, MAX_MODULE_SOFTRESET_WAIT); } -/* At this point the module is configured enough to read the revision */ +/* + * At this point the module is configured enough to read the revision but + * module may not be completely configured yet to use PM runtime. Enable + * all clocks directly during init to configure the quirks needed for PM + * runtime based on the revision register. + */ static int sysc_init_module(struct sysc *ddata) { - int error; + int error = 0; + bool manage_clocks = true; if (ddata->cfg.quirks & - (SYSC_QUIRK_NO_IDLE | SYSC_QUIRK_NO_IDLE_ON_INIT)) { - ddata->revision = sysc_read_revision(ddata); - goto rev_quirks; - } + (SYSC_QUIRK_NO_IDLE | SYSC_QUIRK_NO_IDLE_ON_INIT)) + manage_clocks = false; - error = pm_runtime_get_sync(ddata->dev); - if (error < 0) { - pm_runtime_put_noidle(ddata->dev); + if (manage_clocks) { + error = sysc_enable_opt_clocks(ddata); + if (error) + return error; - return 0; + error = sysc_enable_main_clocks(ddata); + if (error) + goto err_opt_clocks; } + ddata->revision = sysc_read_revision(ddata); + sysc_init_revision_quirks(ddata); + error = sysc_reset(ddata); - if (error) { + if (error) dev_err(ddata->dev, "Reset failed with %d\n", error); - pm_runtime_put_sync(ddata->dev); - return error; - } - - ddata->revision = sysc_read_revision(ddata); - pm_runtime_put_sync(ddata->dev); - -rev_quirks: - sysc_init_revision_quirks(ddata); + if (manage_clocks) + sysc_disable_main_clocks(ddata); +err_opt_clocks: + if (manage_clocks) + sysc_disable_opt_clocks(ddata); - return 0; + return error; } static int sysc_init_sysc_mask(struct sysc *ddata) @@ -1812,11 +1818,11 @@ static int sysc_probe(struct platform_device *pdev) if (error) return error; - pm_runtime_enable(ddata->dev); error = sysc_init_module(ddata); if (error) goto unprepare; + pm_runtime_enable(ddata->dev); error = pm_runtime_get_sync(ddata->dev); if (error < 0) { pm_runtime_put_noidle(ddata->dev); -- 2.30.2