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Commit a1de935a authored by Bhaumik Bhatt's avatar Bhaumik Bhatt
Browse files

mhi: cntrl: qcom: remove DDR bus scale votes in fast suspends 



Remove DDR bus scale votes if doing a suspend which involves
handing off link control to the DRV processor.

Change-Id: Iaba7d0b3f389443af6eca99232f148bc461f4e9a
Signed-off-by: default avatarBhaumik Bhatt <bbhatt@codeaurora.org>
parent 283c2816

drivers/bus/mhi/controllers/mhi_arch_qcom.c

+14 −6
Original line number Diff line number Diff line
@@ -579,12 +579,17 @@ static int mhi_arch_drv_suspend(struct mhi_controller *mhi_cntrl) 
	if (cur_link_info->target_link_speed != PCI_EXP_LNKSTA_CLS_2_5GB) {

		link_info.target_link_speed = PCI_EXP_LNKSTA_CLS_2_5GB;

		link_info.target_link_width = cur_link_info->target_link_width;

		ret = mhi_arch_pcie_scale_bw(mhi_cntrl, pci_dev, &link_info);



		ret = msm_pcie_set_link_bandwidth(pci_dev,

						  link_info.target_link_speed,

						  link_info.target_link_width);

		if (ret) {

			MHI_ERR("Failed to switch Gen1 speed\n");

			return -EBUSY;

		}



		/* no DDR votes when doing a drv suspend */

		mhi_arch_set_bus_request(mhi_cntrl, 0);

		bw_switched = true;

	}
@@ -593,9 +598,7 @@ static int mhi_arch_drv_suspend(struct mhi_controller *mhi_cntrl) 
				  pci_dev, NULL, mhi_cntrl->wake_set ?

				  MSM_PCIE_CONFIG_NO_L1SS_TO : 0);



	/*

	 * we failed to suspend and scaled down pcie bw.. need to scale up again

	 */

	/* failed to suspend and scaled down pcie bw, need to scale up again */

	if (ret && bw_switched) {

		mhi_arch_pcie_scale_bw(mhi_cntrl, pci_dev, cur_link_info);

		return ret;
@@ -713,10 +716,15 @@ int mhi_arch_link_resume(struct mhi_controller *mhi_cntrl) 
	case MHI_FAST_LINK_OFF:

		ret = msm_pcie_pm_control(MSM_PCIE_RESUME, mhi_cntrl->bus,

					  pci_dev, NULL, 0);

		if (ret ||

		    cur_info->target_link_speed == PCI_EXP_LNKSTA_CLS_2_5GB)

		if (ret)

			break;



		if (cur_info->target_link_speed == PCI_EXP_LNKSTA_CLS_2_5GB) {

			mhi_arch_set_bus_request(mhi_cntrl,

						 cur_info->target_link_speed);

			break;

		}



		/*

		 * BW request from device isn't for gen 1 link speed, we can

		 * only print an error here.