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From: "Paweł Anikiel" <pan@semihalf.com>
To: marex@denx.de, simon.k.r.goldschmidt@gmail.com,
	tien.fong.chee@intel.com, michal.simek@xilinx.com
Cc: u-boot@lists.denx.de, sjg@chromium.org, festevam@denx.de,
	jagan@amarulasolutions.com, andre.przywara@arm.com,
	narmstrong@baylibre.com, pbrobinson@gmail.com,
	tharvey@gateworks.com, paul.liu@linaro.org,
	christianshewitt@gmail.com, adrian.fiergolski@fastree3d.com,
	marek.behun@nic.cz, wd@denx.de, elly.siew.chin.lim@intel.com,
	upstream@semihalf.com, amstan@chromium.org,
	"Paweł Anikiel" <pan@semihalf.com>
Subject: [PATCH v3 06/11] misc: atsha204a: Increase wake delay by tWHI
Date: Fri, 17 Jun 2022 12:47:21 +0200	[thread overview]
Message-ID: <20220617104726.158688-7-pan@semihalf.com> (raw)
In-Reply-To: <20220617104726.158688-1-pan@semihalf.com>

From the ATSHA204A datasheet (document DS40002025A):

Wake: If SDA is held low for a period greater than tWLO, the device
exits low-power mode and, after a delay of tWHI, is ready to receive
I2C commands.

tWHI value can be found in table 7-2.

Signed-off-by: Paweł Anikiel <pan@semihalf.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 drivers/misc/atsha204a-i2c.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/atsha204a-i2c.c b/drivers/misc/atsha204a-i2c.c
index aa6acf0f9a..81ecb5b617 100644
--- a/drivers/misc/atsha204a-i2c.c
+++ b/drivers/misc/atsha204a-i2c.c
@@ -21,7 +21,8 @@
 #include <linux/bitrev.h>
 #include <u-boot/crc.h>
 
-#define ATSHA204A_TWLO			60
+#define ATSHA204A_TWLO_US		60
+#define ATSHA204A_TWHI_US		2500
 #define ATSHA204A_TRANSACTION_TIMEOUT	100000
 #define ATSHA204A_TRANSACTION_RETRY	5
 #define ATSHA204A_EXECTIME		5000
@@ -109,7 +110,7 @@ int atsha204a_wakeup(struct udevice *dev)
 			continue;
 		}
 
-		udelay(ATSHA204A_TWLO);
+		udelay(ATSHA204A_TWLO_US + ATSHA204A_TWHI_US);
 
 		res = atsha204a_recv_resp(dev, &resp);
 		if (res) {
-- 
2.36.1.476.g0c4daa206d-goog


  parent reply	other threads:[~2022-06-17 10:49 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-17 10:47 [PATCH v3 00/11] Add Chameleon v3 support Paweł Anikiel
2022-06-17 10:47 ` [PATCH v3 01/11] arm: dts: Add Mercury+ AA1 devicetrees Paweł Anikiel
2022-06-17 10:47 ` [PATCH v3 02/11] arm: dts: Add Chameleonv3 handoff headers Paweł Anikiel
2022-06-17 10:47 ` [PATCH v3 03/11] arm: dts: Add Chameleonv3 devicetrees Paweł Anikiel
2022-06-17 10:47 ` [PATCH v3 04/11] board: Add Chameleonv3 board dir Paweł Anikiel
2022-06-17 10:47 ` [PATCH v3 05/11] config: Add Chameleonv3 config Paweł Anikiel
2022-06-17 10:47 ` Paweł Anikiel [this message]
2022-06-17 10:47 ` [PATCH v3 07/11] sysreset: socfpga: Use parent device for reading base address Paweł Anikiel
2022-06-17 10:47 ` [PATCH v3 08/11] socfpga: arria10: Replace delays with busy waiting in cm_full_cfg Paweł Anikiel
2022-06-20  8:40   ` Chee, Tien Fong
2022-06-20 12:13     ` Paweł Anikiel
2022-06-20 12:29       ` Chee, Tien Fong
2022-06-20 15:59         ` Paweł Anikiel
2022-06-23 11:53           ` Chee, Tien Fong
2022-06-17 10:47 ` [PATCH v3 09/11] socfpga: arria10: Improve bitstream loading speed Paweł Anikiel
2022-06-17 10:47 ` [PATCH v3 10/11] socfpga: arria10: Wait for fifo empty after writing bitstream Paweł Anikiel
2022-06-17 10:47 ` [PATCH v3 11/11] socfpga: arria10: Allow dcache_enable before relocation Paweł Anikiel

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