From ab4d309d8708035bd323b2e2446eb68cda5e61e5 Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 24 Feb 2020 12:58:03 -0800 Subject: bus: ti-sysc: Improve reset to work with modules with no sysconfig At least display susbsystem (DSS) has modules with no sysconfig registers and rely on custom function for module reset handling. Let's make reset work with that too. Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'drivers/bus/ti-sysc.c') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 31dae22890d5..f32ba6ec2ba1 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -1571,7 +1571,7 @@ static int sysc_reset(struct sysc *ddata) sysc_offset = ddata->offsets[SYSC_SYSCONFIG]; syss_offset = ddata->offsets[SYSC_SYSSTATUS]; - if (ddata->legacy_mode || sysc_offset < 0 || + if (ddata->legacy_mode || ddata->cap->regbits->srst_shift < 0 || ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT) return 0; @@ -1586,9 +1586,11 @@ static int sysc_reset(struct sysc *ddata) if (ddata->pre_reset_quirk) ddata->pre_reset_quirk(ddata); - sysc_val = sysc_read_sysconfig(ddata); - sysc_val |= sysc_mask; - sysc_write(ddata, sysc_offset, sysc_val); + if (sysc_offset >= 0) { + sysc_val = sysc_read_sysconfig(ddata); + sysc_val |= sysc_mask; + sysc_write(ddata, sysc_offset, sysc_val); + } if (ddata->cfg.srst_udelay) usleep_range(ddata->cfg.srst_udelay, -- cgit v1.2.3