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Commit 3de2be2b authored by Stanley Chu's avatar Stanley Chu
Browse files

UPSTREAM: scsi: ufs: ufs-mediatek: fix TX LCC disabling timing 

MediaTek UFS host requires TX LCC to be disabled on both host and device
sides. This can be done by disabling host's local TX LCC before link
startup. Correct TX LCC disabling timing in MediaTek UFS driver.

Bug: 151050916
(cherry picked from commit 618b4d07a4420ca9f01837f183ce7b1ac0b31307)
Link: https://lore.kernel.org/r/20200207070357.17169-2-stanley.chu@mediatek.com


Reviewed-by: default avatarAvri Altman <avri.altman@wdc.com>
Signed-off-by: default avatarStanley Chu <stanley.chu@mediatek.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Change-Id: Ic37378698fee798462142461a8a9276e8dd3d726
parent 6aafe1a0

drivers/scsi/ufs/ufs-mediatek.c

+9 −3
Original line number Diff line number Diff line
@@ -313,6 +313,15 @@ static int ufs_mtk_pre_link(struct ufs_hba *hba) 


	ufs_mtk_unipro_powerdown(hba, 0);



	/*

	 * Setting PA_Local_TX_LCC_Enable to 0 before link startup

	 * to make sure that both host and device TX LCC are disabled

	 * once link startup is completed.

	 */

	ret = ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);

	if (ret)

		return ret;



	/* disable deep stall */

	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(VS_SAVEPOWERCONTROL), &tmp);

	if (ret)
@@ -344,9 +353,6 @@ static void ufs_mtk_setup_clk_gating(struct ufs_hba *hba) 


static int ufs_mtk_post_link(struct ufs_hba *hba)

{

	/* disable device LCC */

	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);



	/* enable unipro clock gating feature */

	ufs_mtk_cfg_unipro_cg(hba, true);