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From: Tony Lindgren <tony@atomide.com>
To: linux-omap@vger.kernel.org
Cc: Dave Gerlach <d-gerlach@ti.com>, Faiz Abbas <faiz_abbas@ti.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Grygorii Strashko <grygorii.strashko@ti.com>,
	Keerthy <j-keerthy@ti.com>, Nishanth Menon <nm@ti.com>,
	Peter Ujfalusi <peter.ujfalusi@ti.com>,
	Roger Quadros <rogerq@ti.com>, Suman Anna <s-anna@ti.com>,
	Tero Kristo <t-kristo@ti.com>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCHv2] bus: ti-sysc: Fix bogus resetdone warning on enable for cpsw
Date: Tue, 10 Nov 2020 11:21:27 +0200	[thread overview]
Message-ID: <20201110092127.46638-1-tony@atomide.com> (raw)

Bail out early from sysc_wait_softreset() just like we do in sysc_reset()
if there's no sysstatus srst_shift to fix a bogus resetdone warning on
enable as suggested by Grygorii Strashko <grygorii.strashko@ti.com>.

We do not currently handle resets for modules that need writing to the
sysstatus register. If we at some point add that, we also need to add
SYSS_QUIRK_RESETDONE_INVERTED flag for cpsw as the sysstatus bit is low
when reset is done as described in the am335x TRM "Table 14-202
SOFT_RESET Register Field Descriptions"

Fixes: d46f9fbec719 ("bus: ti-sysc: Use optional clocks on for enable and wait for softreset bit")
Suggested-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---

Changes since v1:
- Drop quirk handling and use fix suggested by Grygorii

---
 drivers/bus/ti-sysc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -227,6 +227,9 @@ static int sysc_wait_softreset(struct sysc *ddata)
 	u32 sysc_mask, syss_done, rstval;
 	int syss_offset, error = 0;
 
+	if (ddata->cap->regbits->srst_shift < 0)
+		return 0;
+
 	syss_offset = ddata->offsets[SYSC_SYSSTATUS];
 	sysc_mask = BIT(ddata->cap->regbits->srst_shift);
 
-- 
2.29.2

WARNING: multiple messages have this Message-ID (diff)
From: Tony Lindgren <tony@atomide.com>
To: linux-omap@vger.kernel.org
Cc: Nishanth Menon <nm@ti.com>, Tero Kristo <t-kristo@ti.com>,
	Grygorii Strashko <grygorii.strashko@ti.com>,
	Dave Gerlach <d-gerlach@ti.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org,
	Peter Ujfalusi <peter.ujfalusi@ti.com>,
	Faiz Abbas <faiz_abbas@ti.com>, Keerthy <j-keerthy@ti.com>,
	linux-arm-kernel@lists.infradead.org,
	Roger Quadros <rogerq@ti.com>
Subject: [PATCHv2] bus: ti-sysc: Fix bogus resetdone warning on enable for cpsw
Date: Tue, 10 Nov 2020 11:21:27 +0200	[thread overview]
Message-ID: <20201110092127.46638-1-tony@atomide.com> (raw)

Bail out early from sysc_wait_softreset() just like we do in sysc_reset()
if there's no sysstatus srst_shift to fix a bogus resetdone warning on
enable as suggested by Grygorii Strashko <grygorii.strashko@ti.com>.

We do not currently handle resets for modules that need writing to the
sysstatus register. If we at some point add that, we also need to add
SYSS_QUIRK_RESETDONE_INVERTED flag for cpsw as the sysstatus bit is low
when reset is done as described in the am335x TRM "Table 14-202
SOFT_RESET Register Field Descriptions"

Fixes: d46f9fbec719 ("bus: ti-sysc: Use optional clocks on for enable and wait for softreset bit")
Suggested-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---

Changes since v1:
- Drop quirk handling and use fix suggested by Grygorii

---
 drivers/bus/ti-sysc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -227,6 +227,9 @@ static int sysc_wait_softreset(struct sysc *ddata)
 	u32 sysc_mask, syss_done, rstval;
 	int syss_offset, error = 0;
 
+	if (ddata->cap->regbits->srst_shift < 0)
+		return 0;
+
 	syss_offset = ddata->offsets[SYSC_SYSSTATUS];
 	sysc_mask = BIT(ddata->cap->regbits->srst_shift);
 
-- 
2.29.2

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             reply	other threads:[~2020-11-10  9:21 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-10  9:21 Tony Lindgren [this message]
2020-11-10  9:21 ` [PATCHv2] bus: ti-sysc: Fix bogus resetdone warning on enable for cpsw Tony Lindgren
2020-11-11 19:28 ` Grygorii Strashko
2020-11-11 19:28   ` Grygorii Strashko

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