linux-kernel - [Patch v2 2/2] memory: tegra: set BPMP msg flags to reset IPC channels

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Date:   Mon, 9 Oct 2023 15:35:57 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     <treding@...dia.com>, <jonathanh@...dia.com>,
        <krzysztof.kozlowski@...aro.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <bbasu@...dia.com>, <sumitg@...dia.com>
Subject: [Patch v2 2/2] memory: tegra: set BPMP msg flags to reset IPC channels

From: Thierry Reding <treding@...dia.com>

Set the 'TEGRA_BPMP_MESSAGE_RESET' bit in newly added 'flags' field
of 'struct tegra_bpmp_message' to request for the reset of BPMP IPC
channels. This is used along with the 'suspended' check in BPMP driver
for handling early bandwidth requests due to the hotplug of CPU's
during system resume before the driver gets resumed.

Fixes: f41e1442ac5b ("cpufreq: tegra194: add OPP support and set bandwidth")
Signed-off-by: Thierry Reding <treding@...dia.com>
Co-developed-by: Sumit Gupta <sumitg@...dia.com>
Signed-off-by: Sumit Gupta <sumitg@...dia.com>
---
 drivers/memory/tegra/tegra234.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/memory/tegra/tegra234.c b/drivers/memory/tegra/tegra234.c
index 9e5b5dbd9c8d..2845041f32d6 100644
--- a/drivers/memory/tegra/tegra234.c
+++ b/drivers/memory/tegra/tegra234.c
@@ -986,6 +986,10 @@ static int tegra234_mc_icc_set(struct icc_node *src, struct icc_node *dst)
 	msg.rx.data = &bwmgr_resp;
 	msg.rx.size = sizeof(bwmgr_resp);
 
+	if (pclient->bpmp_id >= TEGRA_ICC_BPMP_CPU_CLUSTER0 &&
+	    pclient->bpmp_id <= TEGRA_ICC_BPMP_CPU_CLUSTER2)
+		msg.flags = TEGRA_BPMP_MESSAGE_RESET;
+
 	ret = tegra_bpmp_transfer(mc->bpmp, &msg);
 	if (ret < 0) {
 		dev_err(mc->dev, "BPMP transfer failed: %d\n", ret);
-- 
2.17.1