lkml.org 
[lkml]   [2016]   [Mar]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v6 16/17] scsi: ufs-qcom: enable/disable the device ref clock
Date
This change enables the device ref clock before changing to HS mode
and disables it if entered to PWM mode.

Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>

---
drivers/scsi/ufs/ufs-qcom.c | 12 ++++++++++++
drivers/scsi/ufs/ufshcd.h | 9 +++++++++
2 files changed, 21 insertions(+)

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 966bacf..849fcf3 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -980,6 +980,10 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
goto out;
}

+ /* enable the device ref clock before changing to HS mode */
+ if (!ufshcd_is_hs_mode(&hba->pwr_info) &&
+ ufshcd_is_hs_mode(dev_req_params))
+ ufs_qcom_dev_ref_clk_ctrl(host, true);
break;
case POST_CHANGE:
if (ufs_qcom_cfg_timers(hba, dev_req_params->gear_rx,
@@ -1007,6 +1011,11 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
memcpy(&host->dev_req_params,
dev_req_params, sizeof(*dev_req_params));
ufs_qcom_update_bus_bw_vote(host);
+
+ /* disable the device ref clock if entered PWM mode */
+ if (ufshcd_is_hs_mode(&hba->pwr_info) &&
+ !ufshcd_is_hs_mode(dev_req_params))
+ ufs_qcom_dev_ref_clk_ctrl(host, false);
break;
default:
ret = -EINVAL;
@@ -1108,6 +1117,9 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on)
ufs_qcom_phy_disable_iface_clk(host->generic_phy);
goto out;
}
+ /* enable the device ref clock for HS mode*/
+ if (ufshcd_is_hs_mode(&hba->pwr_info))
+ ufs_qcom_dev_ref_clk_ctrl(host, true);
vote = host->bus_vote.saved_vote;
if (vote == host->bus_vote.min_bw_vote)
ufs_qcom_update_bus_bw_vote(host);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 41d9bfd..4bb6566 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -54,6 +54,7 @@
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/regulator/consumer.h>
+#include "unipro.h"

#include <asm/irq.h>
#include <asm/byteorder.h>
@@ -689,6 +690,14 @@ static inline int ufshcd_dme_peer_get(struct ufs_hba *hba,

int ufshcd_read_device_desc(struct ufs_hba *hba, u8 *buf, u32 size);

+static inline bool ufshcd_is_hs_mode(struct ufs_pa_layer_attr *pwr_info)
+{
+ return (pwr_info->pwr_rx == FAST_MODE ||
+ pwr_info->pwr_rx == FASTAUTO_MODE) &&
+ (pwr_info->pwr_tx == FAST_MODE ||
+ pwr_info->pwr_tx == FASTAUTO_MODE);
+}
+
#define ASCII_STD true

int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index, u8 *buf,
--
1.8.5.2
--
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

\
 
 \ /
  Last update: 2016-03-06 13:41    [W:1.313 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site