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patch xu4 dynamic memory controller bug in dev kernel(#2135)

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lanefu 2020-08-05 19:17:48 -04:00 committed by GitHub
parent b4e23b5b6a
commit c0178373c3
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1 changed files with 58 additions and 0 deletions
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58
patch/kernel/odroidxu4-dev/LKML-0001-XU4-exynos5422-dmc-Adjust-polling-interval.patch Normal file
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@ -0,0 +1,58 @@
diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index 93e9c2429c0d..e03ee35f0ab5 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -1466,10 +1466,10 @@ static int exynos5_dmc_probe(struct platform_device *pdev)
* Setup default thresholds for the devfreq governor.
* The values are chosen based on experiments.
*/
- dmc->gov_data.upthreshold = 30;
+ dmc->gov_data.upthreshold = 10;
dmc->gov_data.downdifferential = 5;
- exynos5_dmc_df_profile.polling_ms = 500;
+ exynos5_dmc_df_profile.polling_ms = 100;
}
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;