linux-kernel - [PATCH 4/9] bus: ti-sysc: Add quirk handling for reset on re-init

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Message-Id: <20210921100115.59865-5-tony@atomide.com>
Date:   Tue, 21 Sep 2021 13:01:10 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     linux-omap@...r.kernel.org
Cc:     Dave Gerlach <d-gerlach@...com>, Faiz Abbas <faiz_abbas@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Keerthy <j-keerthy@...com>, Kevin Hilman <khilman@...libre.com>,
        Nishanth Menon <nm@...com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 4/9] bus: ti-sysc: Add quirk handling for reset on re-init

At least am335x gpmc module needs a reset in addition to re-init on resume.
Let's add a quirk handling for reset on re-init.

Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 drivers/bus/ti-sysc.c                 | 10 ++++++++++
 include/linux/platform_data/ti-sysc.h |  1 +
 2 files changed, 11 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
@@ -157,6 +157,7 @@ struct sysc {
 
 static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
 				  bool is_child);
+static int sysc_reset(struct sysc *ddata);
 
 static void sysc_write(struct sysc *ddata, int offset, u32 value)
 {
@@ -1440,6 +1441,15 @@ static int sysc_reinit_module(struct sysc *ddata, bool leave_enabled)
 	if (error)
 		dev_warn(dev, "reinit resume failed: %i\n", error);
 
+	/* Some modules like am335x gpmc need reset and restore of sysconfig */
+	if (ddata->cfg.quirks & SYSC_QUIRK_RESET_ON_CTX_LOST) {
+		error = sysc_reset(ddata);
+		if (error)
+			dev_warn(dev, "reinit reset failed: %i\n", error);
+
+		sysc_write_sysconfig(ddata, ddata->sysconfig);
+	}
+
 	if (leave_enabled)
 		return error;
 
diff --git a/include/linux/platform_data/ti-sysc.h b/include/linux/platform_data/ti-sysc.h
--- a/include/linux/platform_data/ti-sysc.h
+++ b/include/linux/platform_data/ti-sysc.h
@@ -50,6 +50,7 @@ struct sysc_regbits {
 	s8 emufree_shift;
 };
 
+#define SYSC_QUIRK_RESET_ON_CTX_LOST	BIT(29)
 #define SYSC_QUIRK_REINIT_ON_CTX_LOST	BIT(28)
 #define SYSC_QUIRK_REINIT_ON_RESUME	BIT(27)
 #define SYSC_QUIRK_GPMC_DEBUG		BIT(26)
-- 
2.33.0