From: Ulrich Hecht <uli+renesas@fpond.eu>
To: linux-renesas-soc@vger.kernel.org, linux-mmc@vger.kernel.org
Cc: wsa@kernel.org, ulf.hansson@linaro.org,
Ulrich Hecht <uli+renesas@fpond.eu>
Subject: [PATCH] mmc: renesas_sdhi: increase suspend/resume latency limit
Date: Fri, 14 May 2021 17:53:18 +0200 [thread overview]
Message-ID: <20210514155318.16812-1-uli+renesas@fpond.eu> (raw)
The TMIO core sets a very low latency limit (100 us), but when using R-Car
SDHI hosts with SD cards, I have observed typical latencies of around 20-30
ms. This prevents runtime PM from working properly, and the devices remain
on continuously.
This patch sets the default latency limit to 100 ms to avoid that.
Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
---
drivers/mmc/host/renesas_sdhi_core.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
index 635bf31a6735..4f41616cc6bb 100644
--- a/drivers/mmc/host/renesas_sdhi_core.c
+++ b/drivers/mmc/host/renesas_sdhi_core.c
@@ -32,6 +32,7 @@
#include <linux/pinctrl/pinctrl-state.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
+#include <linux/pm_qos.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/sh_dma.h>
@@ -1147,6 +1148,9 @@ int renesas_sdhi_probe(struct platform_device *pdev,
host->ops.hs400_complete = renesas_sdhi_hs400_complete;
}
+ /* keep tmio_mmc_host_probe() from setting latency limit too low */
+ dev_pm_qos_expose_latency_limit(&pdev->dev, 100000);
+
ret = tmio_mmc_host_probe(host);
if (ret < 0)
goto edisclk;
--
2.20.1
next reply other threads:[~2021-05-14 15:53 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-14 15:53 Ulrich Hecht [this message]
2021-05-19 14:25 ` [PATCH] mmc: renesas_sdhi: increase suspend/resume latency limit Wolfram Sang
2021-06-02 15:40 ` Ulrich Hecht
2021-06-18 8:17 ` Wolfram Sang
2021-06-18 10:40 ` Wolfram Sang
2021-06-30 4:44 ` Wolfram Sang
2021-07-30 15:28 ` Wolfram Sang
2021-08-02 5:34 ` Yoshihiro Shimoda
2021-08-02 11:18 ` Ulrich Hecht
2021-08-03 11:16 ` Yoshihiro Shimoda
2021-08-04 5:29 ` Yoshihiro Shimoda
2021-08-04 16:17 ` Ulrich Hecht
2021-08-02 12:53 ` Wolfram Sang
2021-08-03 11:16 ` Yoshihiro Shimoda
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