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scsi: ufs-qcom: set PA_Local_TX_LCC_Enable before link startup

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Some UFS devices (and may be host) have issues if LCC is
enabled. So we are setting PA_Local_TX_LCC_Enable to 0
before link startup which will make sure that both host
and device TX LCC are disabled once link startup is
completed.

Reviewed-by: Gilad Broner <gbroner@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Yaniv Gardi 2016-03-10 17:37:19 +02:00 committed by Martin K. Petersen
parent b799fdf754
commit 4b9ad0b88c
2 changed files with 21 additions and 7 deletions
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27
drivers/scsi/ufs/ufs-qcom.c
View File

@ -16,8 +16,8 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/phy/phy-qcom-ufs.h>
#include "ufshcd.h"
#include "ufshcd-pltfrm.h"
#include "unipro.h"
@ -106,9 +106,11 @@ static void ufs_qcom_disable_lane_clks(struct ufs_qcom_host *host)
if (!host->is_lane_clks_enabled)
return;
clk_disable_unprepare(host->tx_l1_sync_clk);
if (host->hba->lanes_per_direction > 1)
clk_disable_unprepare(host->tx_l1_sync_clk);
clk_disable_unprepare(host->tx_l0_sync_clk);
clk_disable_unprepare(host->rx_l1_sync_clk);
if (host->hba->lanes_per_direction > 1)
clk_disable_unprepare(host->rx_l1_sync_clk);
clk_disable_unprepare(host->rx_l0_sync_clk);
host->is_lane_clks_enabled = false;
@ -272,9 +274,8 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
ret = ufs_qcom_phy_calibrate_phy(phy, is_rate_B);
if (ret) {
dev_err(hba->dev,
"%s: ufs_qcom_phy_calibrate_phy()failed, ret = %d\n",
__func__, ret);
dev_err(hba->dev, "%s: ufs_qcom_phy_calibrate_phy() failed, ret = %d\n",
__func__, ret);
goto out;
}
@ -524,6 +525,18 @@ static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
err = ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(hba,
150);
/*
* Some UFS devices (and may be host) have issues if LCC is
* enabled. So we are setting PA_Local_TX_LCC_Enable to 0
* before link startup which will make sure that both host
* and device TX LCC are disabled once link startup is
* completed.
*/
if (ufshcd_get_local_unipro_ver(hba) != UFS_UNIPRO_VER_1_41)
err = ufshcd_dme_set(hba,
UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
0);
break;
case POST_CHANGE:
ufs_qcom_link_startup_post_change(hba);
@ -1542,7 +1555,7 @@ static int ufs_qcom_probe(struct platform_device *pdev)
* ufs_qcom_remove - set driver_data of the device to NULL
* @pdev: pointer to platform device handle
*
* Always return 0
* Always returns 0
*/
static int ufs_qcom_remove(struct platform_device *pdev)
{

1
drivers/scsi/ufs/unipro.h
View File

@ -75,6 +75,7 @@
#define PA_MAXRXSPEEDFAST 0x1541
#define PA_MAXRXSPEEDSLOW 0x1542
#define PA_TXLINKSTARTUPHS 0x1544
#define PA_LOCAL_TX_LCC_ENABLE 0x155E
#define PA_TXSPEEDFAST 0x1565
#define PA_TXSPEEDSLOW 0x1566
#define PA_REMOTEVERINFO 0x15A0