mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

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>
This commit is contained in:
Lukasz Luba 2020-07-10 20:11:22 +01:00 committed by Chanwoo Choi
parent 74ca9e4610
commit 4fc9a0470d
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/memory/samsung/exynos5422-dmc.c
View File

@ -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;