PCI: rcar: Poll more often in rcar_pcie_wait_for_dl()
diff mbox series

Message ID 20180521170250.13224-1-marek.vasut+renesas@gmail.com
State Superseded
Delegated to: Lorenzo Pieralisi
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Series
  • PCI: rcar: Poll more often in rcar_pcie_wait_for_dl()
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Commit Message

Marek Vasut May 21, 2018, 5:02 p.m. UTC
The data link active signal usually takes ~20 uSec to be asserted,
poll the bit more often to avoid useless delays in this function.
Use udelay() instead of usleep() for such a small delay as suggested
by the timer documentation and because this will be used in atomic
content later on when the suspend/resume patches land.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Phil Edworthy <phil.edworthy@renesas.com>
Cc: Simon Horman <horms+renesas@verge.net.au>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: linux-renesas-soc@vger.kernel.org
---
 drivers/pci/host/pcie-rcar.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Sergei Shtylyov May 21, 2018, 6:09 p.m. UTC | #1
On 05/21/2018 08:02 PM, Marek Vasut wrote:

> The data link active signal usually takes ~20 uSec to be asserted,
> poll the bit more often to avoid useless delays in this function.
> Use udelay() instead of usleep() for such a small delay as suggested
> by the timer documentation and because this will be used in atomic
> content later on when the suspend/resume patches land.
  ^^^^^^^ context :-)

> Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
> Cc: Geert Uytterhoeven <geert+renesas@glider.be>
> Cc: Phil Edworthy <phil.edworthy@renesas.com>
> Cc: Simon Horman <horms+renesas@verge.net.au>
> Cc: Wolfram Sang <wsa@the-dreams.de>
> Cc: linux-renesas-soc@vger.kernel.org
[...]

MBR, Sergei

Patch
diff mbox series

diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
index 5c365f743df5..65ebe7aa3488 100644
--- a/drivers/pci/host/pcie-rcar.c
+++ b/drivers/pci/host/pcie-rcar.c
@@ -529,13 +529,13 @@  static void phy_write_reg(struct rcar_pcie *pcie,
 
 static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie)
 {
-	unsigned int timeout = 10;
+	unsigned int timeout = 10000;
 
 	while (timeout--) {
 		if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE))
 			return 0;
 
-		msleep(5);
+		udelay(5);
 	}
 
 	return -ETIMEDOUT;