Patch set updated for coreboot: parade/ps8640: add delay to every loop when polling ps8640 ready

[Martin Roth]

Martin Roth ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/16364

-gerrit

commit e25ea49d6cae34085a5bb1b2755de28a6330845e
Author: Jitao Shi 
Date:   Wed Aug 17 10:21:37 2016 +0800

parade/ps8640: add delay to every loop when polling ps8640 ready

Add delay before and in polling ps8640 ready to reduce the frequency
    of polling.

BUG=chrome-os-partner:54897
    BRANCH=none
    TEST=build pass elm and show ui

Change-Id: I43c833af910490e53496a343330a6a6af35623a9
    Signed-off-by: Martin Roth 
    Original-Commit-Id: bc8c3d6f7cf0b2da693a465cf3845e8bbc53825a
    Original-Change-Id: I5c725eed8110ff9f545c1142ca28bcff336b6860
    Original-Signed-off-by: Jitao Shi 
    Original-Reviewed-on: https://chromium-review.googlesource.com/371718
    Original-Commit-Ready: Nicolas Boichat 
    Original-Tested-by: jitao shi 
    Original-Reviewed-by: Julius Werner 
    Original-Reviewed-by: Daniel Kurtz 
---
 src/drivers/parade/ps8640/ps8640.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/drivers/parade/ps8640/ps8640.c b/src/drivers/parade/ps8640/ps8640.c
index 884b46af..c26c6ef 100644
--- a/src/drivers/parade/ps8640/ps8640.c
+++ b/src/drivers/parade/ps8640/ps8640.c
@@ -60,16 +60,22 @@ int ps8640_init(uint8_t bus, uint8_t chip)
    u8 set_vdo_done;
    struct stopwatch sw;

-	stopwatch_init_msecs_expire(&sw, 350);
+	mdelay(200);
+	stopwatch_init_msecs_expire(&sw, 200);

-	do {
+	while (true) {
    	i2c_readb(bus, chip + 2, PAGE2_GPIO_H, &set_vdo_done);
+		if ((set_vdo_done & PS_GPIO9) == PS_GPIO9)
+			break;
    	if (stopwatch_expired(&sw)) {
    		printk(BIOS_INFO, "Failed to init ps8640.\n");
    		return -1;
    	}
-	} while ((set_vdo_done & PS_GPIO9) != PS_GPIO9);

+		mdelay(20);
+	}
+
+	mdelay(50);
    i2c_writeb(bus, chip + 3, PAGE3_SET_ADD, VDO_CTL_ADD);
    i2c_writeb(bus, chip + 3, PAGE3_SET_VAL, VDO_DIS);
    i2c_writeb(bus, chip + 3, PAGE3_SET_ADD, VDO_CTL_ADD);