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Message-Id: <1571668177-3766-5-git-send-email-rampraka@codeaurora.org>
Date: Mon, 21 Oct 2019 19:59:35 +0530
From: Ram Prakash Gupta <rampraka@...eaurora.org>
To: asutoshd@...eaurora.org, stummala@...eaurora.org,
sayalil@...eaurora.org, rampraka@...eaurora.org,
vbadigan@...eaurora.org, cang@...eaurora.org, ppvk@...eaurora.org,
adrian.hunter@...el.com, ulf.hansson@...aro.org,
robh+dt@...nel.org, linux-mmc@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc: Sujit Reddy Thumma <sthumma@...eaurora.org>,
Talel Shenhar <tatias@...eaurora.org>,
Ritesh Harjani <riteshh@...eaurora.org>,
"Bao D. Nguyen" <nguyenb@...eaurora.org>
Subject: [RFC 4/6] mmc: core: Add debugfs entries for scaling support
Add debugfs entries for scaling support.
Signed-off-by: Sujit Reddy Thumma <sthumma@...eaurora.org>
Signed-off-by: Talel Shenhar <tatias@...eaurora.org>
Signed-off-by: Sahitya Tummala <stummala@...eaurora.org>
Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
Signed-off-by: Ritesh Harjani <riteshh@...eaurora.org>
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
Signed-off-by: Can Guo <cang@...eaurora.org>
Signed-off-by: Sayali Lokhande <sayalil@...eaurora.org>
Co-Developed-by: Ram Prakash Gupta <rampraka@...eaurora.org>
Signed-off-by: Ram Prakash Gupta <rampraka@...eaurora.org>
---
drivers/mmc/core/debugfs.c | 90 ++++++++++++++++++++++++++
drivers/mmc/core/host.c | 153 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 243 insertions(+)
diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index 09e0c76..a9f1e3f 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -222,6 +222,81 @@ static int mmc_clock_opt_set(void *data, u64 val)
DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
"%llu\n");
+static int mmc_scale_get(void *data, u64 *val)
+{
+ struct mmc_host *host = data;
+
+ *val = host->clk_scaling.curr_freq;
+
+ return 0;
+}
+
+static int mmc_scale_set(void *data, u64 val)
+{
+ int err = 0;
+ struct mmc_host *host = data;
+
+ mmc_claim_host(host);
+
+ /* change frequency from sysfs manually */
+ err = mmc_clk_update_freq(host, val, host->clk_scaling.state);
+ if (err == -EAGAIN)
+ err = 0;
+ else if (err)
+ pr_err("%s: clock scale to %llu failed with error %d\n",
+ mmc_hostname(host), val, err);
+ else
+ pr_debug("%s: clock change to %llu finished successfully (%s)\n",
+ mmc_hostname(host), val, current->comm);
+
+ mmc_release_host(host);
+
+ return err;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(mmc_scale_fops, mmc_scale_get, mmc_scale_set,
+ "%llu\n");
+
+static int mmc_max_clock_get(void *data, u64 *val)
+{
+ struct mmc_host *host = data;
+
+ if (!host)
+ return -EINVAL;
+
+ *val = host->f_max;
+
+ return 0;
+}
+
+static int mmc_max_clock_set(void *data, u64 val)
+{
+ struct mmc_host *host = data;
+ int err = -EINVAL;
+ unsigned long freq = val;
+ unsigned int old_freq;
+
+ if (!host || (val < host->f_min))
+ goto out;
+
+ mmc_claim_host(host);
+ if (host->bus_ops && host->bus_ops->change_bus_speed) {
+ old_freq = host->f_max;
+ host->f_max = freq;
+
+ err = host->bus_ops->change_bus_speed(host, &freq);
+
+ if (err)
+ host->f_max = old_freq;
+ }
+ mmc_release_host(host);
+out:
+ return err;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(mmc_max_clock_fops, mmc_max_clock_get,
+ mmc_max_clock_set, "%llu\n");
+
void mmc_add_host_debugfs(struct mmc_host *host)
{
struct dentry *root;
@@ -235,6 +310,19 @@ void mmc_add_host_debugfs(struct mmc_host *host)
debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
&mmc_clock_fops);
+ if (!debugfs_create_file("max_clock", 0600, root, host,
+ &mmc_max_clock_fops))
+ goto err_node;
+
+ if (!debugfs_create_file("scale", 0600, root, host,
+ &mmc_scale_fops))
+ goto err_node;
+
+ if (!debugfs_create_bool("skip_clk_scale_freq_update",
+ 0600, root,
+ &host->clk_scaling.skip_clk_scale_freq_update))
+ goto err_node;
+
#ifdef CONFIG_FAIL_MMC_REQUEST
if (fail_request)
setup_fault_attr(&fail_default_attr, fail_request);
@@ -242,6 +330,8 @@ void mmc_add_host_debugfs(struct mmc_host *host)
fault_create_debugfs_attr("fail_mmc_request", root,
&host->fail_mmc_request);
#endif
+err_node:
+ return;
}
void mmc_remove_host_debugfs(struct mmc_host *host)
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 9138041..c5b904b 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -522,6 +522,154 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
EXPORT_SYMBOL(mmc_alloc_host);
+static ssize_t enable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mmc_host *host = cls_dev_to_mmc_host(dev);
+
+ if (!host)
+ return -EINVAL;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", mmc_can_scale_clk(host));
+}
+
+static ssize_t enable_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct mmc_host *host = cls_dev_to_mmc_host(dev);
+ unsigned long value;
+
+ if (!host || !host->card || kstrtoul(buf, 0, &value))
+ return -EINVAL;
+
+ mmc_get_card(host->card, NULL);
+
+ if (!value) {
+ /* Suspend the clock scaling and mask host capability */
+ if (host->clk_scaling.enable)
+ mmc_suspend_clk_scaling(host);
+ host->clk_scaling.enable = false;
+ host->caps2 &= ~MMC_CAP2_CLK_SCALE;
+ host->clk_scaling.state = MMC_LOAD_HIGH;
+ /* Set to max. frequency when disabling */
+ mmc_clk_update_freq(host, host->card->clk_scaling_highest,
+ host->clk_scaling.state);
+ } else if (value) {
+ /* Unmask host capability and resume scaling */
+ host->caps2 |= MMC_CAP2_CLK_SCALE;
+ if (!host->clk_scaling.enable) {
+ host->clk_scaling.enable = true;
+ mmc_resume_clk_scaling(host);
+ }
+ }
+
+ mmc_put_card(host->card, NULL);
+
+ return count;
+}
+
+static ssize_t up_threshold_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mmc_host *host = cls_dev_to_mmc_host(dev);
+
+ if (!host)
+ return -EINVAL;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", host->clk_scaling.upthreshold);
+}
+
+#define MAX_PERCENTAGE 100
+static ssize_t up_threshold_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct mmc_host *host = cls_dev_to_mmc_host(dev);
+ unsigned long value;
+
+ if (!host || kstrtoul(buf, 0, &value) || (value > MAX_PERCENTAGE))
+ return -EINVAL;
+
+ host->clk_scaling.upthreshold = value;
+
+ pr_debug("%s: clkscale_up_thresh set to %lu\n",
+ mmc_hostname(host), value);
+ return count;
+}
+
+static ssize_t down_threshold_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mmc_host *host = cls_dev_to_mmc_host(dev);
+
+ if (!host)
+ return -EINVAL;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ host->clk_scaling.downthreshold);
+}
+
+static ssize_t down_threshold_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct mmc_host *host = cls_dev_to_mmc_host(dev);
+ unsigned long value;
+
+ if (!host || kstrtoul(buf, 0, &value) || (value > MAX_PERCENTAGE))
+ return -EINVAL;
+
+ host->clk_scaling.downthreshold = value;
+
+ pr_debug("%s: clkscale_down_thresh set to %lu\n",
+ mmc_hostname(host), value);
+ return count;
+}
+
+static ssize_t polling_interval_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mmc_host *host = cls_dev_to_mmc_host(dev);
+
+ if (!host)
+ return -EINVAL;
+
+ return snprintf(buf, PAGE_SIZE, "%lu milliseconds\n",
+ host->clk_scaling.polling_delay_ms);
+}
+
+static ssize_t polling_interval_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct mmc_host *host = cls_dev_to_mmc_host(dev);
+ unsigned long value;
+
+ if (!host || kstrtoul(buf, 0, &value))
+ return -EINVAL;
+
+ host->clk_scaling.polling_delay_ms = value;
+
+ pr_debug("%s: clkscale_polling_delay_ms set to %lu\n",
+ mmc_hostname(host), value);
+ return count;
+}
+
+DEVICE_ATTR_RW(enable);
+DEVICE_ATTR_RW(polling_interval);
+DEVICE_ATTR_RW(up_threshold);
+DEVICE_ATTR_RW(down_threshold);
+
+static struct attribute *clk_scaling_attrs[] = {
+ &dev_attr_enable.attr,
+ &dev_attr_up_threshold.attr,
+ &dev_attr_down_threshold.attr,
+ &dev_attr_polling_interval.attr,
+ NULL,
+};
+
+static struct attribute_group clk_scaling_attr_grp = {
+ .name = "clk_scaling",
+ .attrs = clk_scaling_attrs,
+};
+
/**
* mmc_add_host - initialise host hardware
* @host: mmc host
@@ -551,6 +699,10 @@ int mmc_add_host(struct mmc_host *host)
#ifdef CONFIG_DEBUG_FS
mmc_add_host_debugfs(host);
#endif
+ err = sysfs_create_group(&host->class_dev.kobj, &clk_scaling_attr_grp);
+ if (err)
+ pr_err("%s: failed to create clk scale sysfs group with err %d\n",
+ __func__, err);
mmc_start_host(host);
mmc_register_pm_notifier(host);
@@ -577,6 +729,7 @@ void mmc_remove_host(struct mmc_host *host)
mmc_remove_host_debugfs(host);
#endif
+ sysfs_remove_group(&host->class_dev.kobj, &clk_scaling_attr_grp);
device_del(&host->class_dev);
led_trigger_unregister_simple(host->led);
--
1.9.1
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