linux-kernel - [Patch V2 1/2] memory: tegra: Add SID override programming for MC clients

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Message-ID: <20231107112713.21399-1-amhetre@nvidia.com>
Date:   Tue, 7 Nov 2023 16:57:12 +0530
From:   Ashish Mhetre <amhetre@...dia.com>
To:     <krzysztof.kozlowski@...aro.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <dmitry.osipenko@...labora.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Ashish Mhetre" <amhetre@...dia.com>
Subject: [Patch V2 1/2] memory: tegra: Add SID override programming for MC clients

For some devices the bootloader/firmware may set up the device in
bypass. Memory clients like display needs kernel to program SID after
resume because bootloader/firmware programs the SID of display device to
bypass. In order to make sure that kernel IOMMU mappings for these
devices work after resume, add SID override programming support for all
memory clients on memory controller resume.

This partially reverts 'commit ef86b2c2807f ("memory: tegra: Remove
clients SID override programming")'

Signed-off-by: Ashish Mhetre <amhetre@...dia.com>
---
Changes in v2:
- Fixed build issues reported by Kernel test robot from v1

 drivers/memory/tegra/tegra186.c | 14 ++++++++++++++
 include/soc/tegra/mc.h          |  1 +
 2 files changed, 15 insertions(+)

diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
index 533f85a4b2bd..8203f0db1350 100644
--- a/drivers/memory/tegra/tegra186.c
+++ b/drivers/memory/tegra/tegra186.c
@@ -136,9 +136,23 @@ static int tegra186_mc_probe_device(struct tegra_mc *mc, struct device *dev)
 	return 0;
 }
 
+static int tegra186_mc_resume(struct tegra_mc *mc)
+{
+	unsigned int i;
+
+	for (i = 0; i < mc->soc->num_clients; i++) {
+		const struct tegra_mc_client *client = &mc->soc->clients[i];
+
+		tegra186_mc_client_sid_override(mc, client, client->sid);
+	}
+
+	return 0;
+}
+
 const struct tegra_mc_ops tegra186_mc_ops = {
 	.probe = tegra186_mc_probe,
 	.remove = tegra186_mc_remove,
+	.resume = tegra186_mc_resume,
 	.probe_device = tegra186_mc_probe_device,
 	.handle_irq = tegra30_mc_handle_irq,
 };
diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
index 71ae37d3bedd..af1d73a7f0cd 100644
--- a/include/soc/tegra/mc.h
+++ b/include/soc/tegra/mc.h
@@ -162,6 +162,7 @@ struct tegra_mc_ops {
 	 */
 	int (*probe)(struct tegra_mc *mc);
 	void (*remove)(struct tegra_mc *mc);
+	int (*resume)(struct tegra_mc *mc);
 	irqreturn_t (*handle_irq)(int irq, void *data);
 	int (*probe_device)(struct tegra_mc *mc, struct device *dev);
 };
-- 
2.17.1