From 5251b6be8bb5c5675bdf12347c7b83937a5c91e5 Mon Sep 17 00:00:00 2001 From: Arend Van Spriel Date: Mon, 5 Sep 2016 11:42:13 +0100 Subject: [PATCH] brcmfmac: sdio: shorten retry loop in brcmf_sdio_kso_control() In brcmf_sdio_kso_control() there is a retry loop as hardware may take time to settle. However, when the call to brcmf_sdiod_regrb() returns an error it is due to SDIO access failure and it makes no sense to wait for hardware to settle. This patch aborts the loop after a number of subsequent access errors. Reviewed-by: Hante Meuleman Reviewed-by: Pieter-Paul Giesberts Reviewed-by: Franky Lin Signed-off-by: Arend van Spriel Signed-off-by: Kalle Valo --- .../net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c index 589a49cd9cd5..b892dac70f4b 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c @@ -313,6 +313,7 @@ struct rte_console { #define KSO_WAIT_US 50 #define MAX_KSO_ATTEMPTS (PMU_MAX_TRANSITION_DLY/KSO_WAIT_US) +#define BRCMF_SDIO_MAX_ACCESS_ERRORS 5 /* * Conversion of 802.1D priority to precedence level @@ -677,6 +678,7 @@ brcmf_sdio_kso_control(struct brcmf_sdio *bus, bool on) { u8 wr_val = 0, rd_val, cmp_val, bmask; int err = 0; + int err_cnt = 0; int try_cnt = 0; brcmf_dbg(TRACE, "Enter: on=%d\n", on); @@ -712,9 +714,14 @@ brcmf_sdio_kso_control(struct brcmf_sdio *bus, bool on) */ rd_val = brcmf_sdiod_regrb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR, &err); - if (((rd_val & bmask) == cmp_val) && !err) + if (!err) { + if ((rd_val & bmask) == cmp_val) + break; + err_cnt = 0; + } + /* bail out upon subsequent access errors */ + if (err && (err_cnt++ > BRCMF_SDIO_MAX_ACCESS_ERRORS)) break; - udelay(KSO_WAIT_US); brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR, wr_val, &err); -- 2.30.2