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authorLukasz Luba <lukasz.luba@arm.com>2020-07-10 20:11:22 +0100
committerChanwoo Choi <cw00.choi@samsung.com>2020-07-30 17:22:57 +0900
commit4fc9a0470d2dc370289e9d883feb41e5dd2c6303 (patch)
treefde2894800993492d63e8401c2eea073a01d9032 /drivers/memory
parent74ca9e46107879551e2625bfbfbfd71da1881b82 (diff)
downloadlinux-4fc9a0470d2dc370289e9d883feb41e5dd2c6303.tar.bz2
memory: samsung: exynos5422-dmc: Add module param to control IRQ mode
The driver can operate in two modes relaying on devfreq monitoring mechanism which periodically checks the device status or it can use interrupts when they are provided by loaded Device Tree. The newly introduced module parameter can be used to choose between devfreq monitoring and internal interrupts without modifying the Device Tree. It also sets devfreq monitoring as default when the parameter is not set (also the case for default when the driver is not built as a module). Reported-by: Willy Wolff <willy.mh.wolff.ml@gmail.com> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'drivers/memory')
-rw-r--r--drivers/memory/samsung/exynos5422-dmc.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index e03ee35f0ab5..53bfe6b7b703 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -12,6 +12,7 @@
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/of_device.h>
#include <linux/pm_opp.h>
#include <linux/platform_device.h>
@@ -21,6 +22,10 @@
#include "../jedec_ddr.h"
#include "../of_memory.h"
+static int irqmode;
+module_param(irqmode, int, 0644);
+MODULE_PARM_DESC(irqmode, "Enable IRQ mode (0=off [default], 1=on)");
+
#define EXYNOS5_DREXI_TIMINGAREF (0x0030)
#define EXYNOS5_DREXI_TIMINGROW0 (0x0034)
#define EXYNOS5_DREXI_TIMINGDATA0 (0x0038)
@@ -1428,7 +1433,7 @@ static int exynos5_dmc_probe(struct platform_device *pdev)
/* There is two modes in which the driver works: polling or IRQ */
irq[0] = platform_get_irq_byname(pdev, "drex_0");
irq[1] = platform_get_irq_byname(pdev, "drex_1");
- if (irq[0] > 0 && irq[1] > 0) {
+ if (irq[0] > 0 && irq[1] > 0 && irqmode) {
ret = devm_request_threaded_irq(dev, irq[0], NULL,
dmc_irq_thread, IRQF_ONESHOT,
dev_name(dev), dmc);
@@ -1485,7 +1490,7 @@ static int exynos5_dmc_probe(struct platform_device *pdev)
if (dmc->in_irq_mode)
exynos5_dmc_start_perf_events(dmc, PERF_COUNTER_START_VALUE);
- dev_info(dev, "DMC initialized\n");
+ dev_info(dev, "DMC initialized, in irq mode: %d\n", dmc->in_irq_mode);
return 0;