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Commit 158da626 authored by Yan He's avatar Yan He
Browse files

msm: pcie: add bus bandwidth voting in PCIe driver 



Add the bus bandwidth voting in PCIe driver when PCIe link is
enabled and remove the voting when the link is disabled.

Change-Id: Ie2af0454bba279b4fba7b9c10c3ac196d61a4a73
Signed-off-by: default avatarYan He <yanhe@codeaurora.org>
parent bc89b16c

arch/arm/mach-msm/pcie.c

+40 −0
Original line number Diff line number Diff line
@@ -35,6 +35,8 @@ 
#include <mach/gpiomux.h>

#include <mach/hardware.h>

#include <mach/msm_iomap.h>

#include <linux/msm-bus.h>

#include <linux/msm-bus-board.h>



#include "pcie.h"
@@ -480,6 +482,16 @@ static int msm_pcie_clk_init(struct msm_pcie_dev_t *dev) 
		return rc;

	}



	if (dev->bus_client) {

		rc = msm_bus_scale_client_update_request(dev->bus_client, 1);

		if (rc) {

			pr_err(

				"PCIe:%s:fail to set bus bandwidth for RC %d:%d\n",

				__func__, dev->rc_idx, rc);

			return rc;

		}

	}



	for (i = 0; i < MSM_PCIE_MAX_CLK; i++) {

		info = &dev->clk[i];
@@ -520,11 +532,20 @@ static int msm_pcie_clk_init(struct msm_pcie_dev_t *dev) 
static void msm_pcie_clk_deinit(struct msm_pcie_dev_t *dev)

{

	int i;

	int rc;



	for (i = 0; i < MSM_PCIE_MAX_CLK; i++)

		if (dev->clk[i].hdl)

			clk_disable_unprepare(dev->clk[i].hdl);



	if (dev->bus_client) {

		rc = msm_bus_scale_client_update_request(dev->bus_client, 0);

		if (rc)

			pr_err(

				"PCIe:%s:fail to set bus bandwidth for RC %d:%d\n",

				__func__, dev->rc_idx, rc);

	}



	regulator_disable(dev->gdsc);

}
@@ -841,6 +862,25 @@ static int msm_pcie_get_resources(struct msm_pcie_dev_t *dev, 
		}

	}





	dev->bus_scale_table = msm_bus_cl_get_pdata(pdev);

	if (!dev->bus_scale_table) {

		PCIE_DBG("PCIe: No bus scale table for RC %d (%s)\n",

			dev->rc_idx, dev->pdev->name);

		dev->bus_client = 0;

	} else {

		dev->bus_client =

			msm_bus_scale_register_client(dev->bus_scale_table);

		if (!dev->bus_client) {

			pr_err(

				"PCIe: Failed to register bus client for RC %d (%s)\n",

				dev->rc_idx, dev->pdev->name);

			msm_bus_cl_clear_pdata(dev->bus_scale_table);

			ret = -ENODEV;

			goto out;

		}

	}



	for (i = 0; i < MSM_PCIE_MAX_RES; i++) {

		res_info = &dev->res[i];

arch/arm/mach-msm/pcie.h

+2 −0
Original line number Diff line number Diff line
@@ -171,6 +171,8 @@ struct msm_pcie_dev_t { 
	struct pci_saved_state	     *saved_state;



	struct wakeup_source	     ws;

	struct msm_bus_scale_pdata   *bus_scale_table;

	uint32_t                     bus_client;



	bool                         l1ss_supported;

	bool                         aux_clk_sync;