diff options
| author | Henry Lin <henryl@nvidia.com> | 2013-10-29 15:53:54 +0800 |
|---|---|---|
| committer | Harry Hong <hhong@nvidia.com> | 2014-01-13 16:31:18 -0800 |
| commit | 05536b463ba44cbe75a9002d34162d49b0009cf0 (patch) | |
| tree | 2314c3f3ebf9e07b083c12762dc89fdfc1878406 /drivers | |
| parent | ac4193a64d2a45b56e38d5bdfce0b129628fb22a (diff) | |
xhci: tegra: Reset EMC bandwidth before elpg
xhci fw informs driver the changes to maximum bandwidth requirement
by MBOX_CMD_SET_BW mailbox command. Driver should reset the required
bandwidth to 0 before going to elpg.
Bug 1371282
Change-Id: Ic7cdd4d95335a02bce6b017d9d5af101bd4b1365
Signed-off-by: Henry Lin <henryl@nvidia.com>
Reviewed-on: http://git-master/r/304734
(cherry picked from commit f21d0ee5e1cadd578ad962df02f90a38adf16369)
Signed-off-by: Henry Lin <henryl@nvidia.com>
Reviewed-on: http://git-master/r/354846
Reviewed-by: Harry Hong <hhong@nvidia.com>
Tested-by: Harry Hong <hhong@nvidia.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/xhci-tegra.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c index 816cca927913..2b75dcfc6040 100644 --- a/drivers/usb/host/xhci-tegra.c +++ b/drivers/usb/host/xhci-tegra.c @@ -1443,6 +1443,14 @@ static void utmip_biaspd_workaround(struct tegra_xhci_hcd *tegra) } } +static void tegra_xusb_set_bw(struct tegra_xhci_hcd *tegra, unsigned int bw) +{ + unsigned int freq_khz; + + freq_khz = tegra_emc_bw_to_freq_req(bw); + clk_set_rate(tegra->emc_clk, freq_khz * 1000); +} + static void tegra_xhci_save_dfe_ctle_context(struct tegra_xhci_hcd *tegra, u8 port) { @@ -2055,6 +2063,9 @@ static int tegra_xhci_ss_elpg_entry(struct tegra_xhci_hcd *tegra) must_have_sync_lock(tegra); + /* update maximum BW requirement to 0 */ + tegra_xusb_set_bw(tegra, 0); + /* This is SS partition ELPG entry * STEP 0: firmware will set WOC WOD bits in PVTPORTSC2 regs. */ @@ -2583,7 +2594,6 @@ tegra_xhci_process_mbox_message(struct work_struct *work) struct tegra_xhci_hcd *tegra = container_of(work, struct tegra_xhci_hcd, mbox_work); struct xhci_hcd *xhci = tegra->xhci; - unsigned int freq_khz; mutex_lock(&tegra->mbox_lock); @@ -2633,8 +2643,9 @@ tegra_xhci_process_mbox_message(struct work_struct *work) goto send_sw_response; case MBOX_CMD_SET_BW: /* fw sends BW request in MByte/sec */ - freq_khz = tegra_emc_bw_to_freq_req(tegra->cmd_data << 10); - clk_set_rate(tegra->emc_clk, freq_khz * 1000); + mutex_lock(&tegra->sync_lock); + tegra_xusb_set_bw(tegra, tegra->cmd_data << 10); + mutex_unlock(&tegra->sync_lock); /* clear MBOX_SMI_INT_EN bit */ cmd = readl(tegra->fpci_base + XUSB_CFG_ARU_MBOX_CMD); |