linux-kernel - [PATCH v7 4/4] mmc: sdhci-tegra: Use actual clock rate for SW tuning correction

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 6 Oct 2022 18:36:22 +0530
From:   Prathamesh Shete <pshete@...dia.com>
To:     <adrian.hunter@...el.com>, <ulf.hansson@...aro.org>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <p.zabel@...gutronix.de>, <linux-mmc@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <anrao@...dia.com>, <smangipudi@...dia.com>, <pshete@...dia.com>,
        <kyarlagadda@...dia.com>
Subject: [PATCH v7 4/4] mmc: sdhci-tegra: Use actual clock rate for SW tuning correction

Ensure tegra_host member "curr_clk_rate" holds the actual clock rate
instead of requested clock rate for proper use during tuning correction
algorithm. Actual clk rate may not be the same as the requested clk
frequency depending on the parent clock source set. Tuning correction
algorithm depends on certain parameters which are sensitive to current
clk rate. If the host clk is selected instead of the actual clock rate,
tuning correction algorithm may end up applying invalid correction,
which could result in errors

Fixes: ea8fc5953e8b ("mmc: tegra: update hw tuning process")

Signed-off-by: Aniruddha TVS Rao <anrao@...dia.com>
Signed-off-by: Prathamesh Shete <pshete@...dia.com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Acked-by: Thierry Reding <treding@...dia.com>
---
 drivers/mmc/host/sdhci-tegra.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 3663c5d0efe0..ccbb26a66284 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -783,7 +783,7 @@ static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 		dev_err(dev, "failed to set clk rate to %luHz: %d\n",
 			host_clk, err);
 
-	tegra_host->curr_clk_rate = host_clk;
+	tegra_host->curr_clk_rate = clk_get_rate(pltfm_host->clk);
 	if (tegra_host->ddr_signaling)
 		host->max_clk = host_clk;
 	else
-- 
2.17.1