linux-kernel - Re: [PATCH v3 3/3] pci: dra7xx: use pdata callbacks to perform reset

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Date:	Tue, 1 Mar 2016 08:25:58 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	Kishon Vijay Abraham I <kishon@...com>
cc:	Sekhar Nori <nsekhar@...com>, Suman Anna <s-anna@...com>,
	d-gerlach@...com, Tony Lindgren <tony@...mide.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, richardcochran@...il.com,
	Russell King <linux@....linux.org.uk>,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] pci: dra7xx: use pdata callbacks to perform
 reset


Folks, the following is what I've queued for this.


- Paul


From: Sekhar Nori <nsekhar@...com>
Date: Thu, 18 Feb 2016 16:49:56 +0530
Subject: [PATCH] ARM: DRA7: hwmod: Add custom reset handler for PCIeSS

Add a custom reset handler for DRA7x PCIeSS. This
handler is required to deassert PCIe hardreset lines
after they have been asserted.

This enables the PCIe driver to access registers after
PCIeSS has been runtime enabled without having to
deassert hardreset lines itself.

With this patch applied, used lspci to make sure
connected PCIe device enumerates on DRA74x and DRA72x
EVMs.

Signed-off-by: Sekhar Nori <nsekhar@...com>
Reported-by: Richard Cochran <richardcochran@...il.com>
Tested-by: Kishon Vijay Abraham I <kishon@...com>
Cc: Suman Anna <s-anna@...com>
Cc: Dave Gerlach <d-gerlach@...com>
Cc: Tony Lindgren <tony@...mide.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Russell King <linux@....linux.org.uk>
Signed-off-by: Paul Walmsley <paul@...an.com>
---
 arch/arm/mach-omap2/omap_hwmod_7xx_data.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/arch/arm/mach-omap2/omap_hwmod_7xx_data.c b/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
index b61355e2a771..252b74633e31 100644
--- a/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
@@ -1526,8 +1526,31 @@ static struct omap_hwmod dra7xx_ocp2scp3_hwmod = {
  *
  */
 
+/*
+ * As noted in documentation for _reset() in omap_hwmod.c, the stock reset
+ * functionality of OMAP HWMOD layer does not deassert the hardreset lines
+ * associated with an IP automatically leaving the driver to handle that
+ * by itself. This does not work for PCIeSS which needs the reset lines
+ * deasserted for the driver to start accessing registers.
+ *
+ * We use a PCIeSS HWMOD class specific reset handler to deassert the hardreset
+ * lines after asserting them.
+ */
+static int dra7xx_pciess_reset(struct omap_hwmod *oh)
+{
+	int i;
+
+	for (i = 0; i < oh->rst_lines_cnt; i++) {
+		omap_hwmod_assert_hardreset(oh, oh->rst_lines[i].name);
+		omap_hwmod_deassert_hardreset(oh, oh->rst_lines[i].name);
+	}
+
+	return 0;
+}
+
 static struct omap_hwmod_class dra7xx_pciess_hwmod_class = {
 	.name	= "pcie",
+	.reset	= dra7xx_pciess_reset,
 };
 
 /* pcie1 */
-- 
2.7.0