From bc8c3d6f7cf0b2da693a465cf3845e8bbc53825a Mon Sep 17 00:00:00 2001 From: Jitao Shi Date: Wed, 17 Aug 2016 10:21:37 +0800 Subject: [PATCH] ps8640: add delay every loop when polling ps8640 ready add delay before and in polling ps8640 ready for reduce the frequence of polling BUG=chrome-os-partner:54897 BRANCH=none TEST=build pass elm and show ui Change-Id: I5c725eed8110ff9f545c1142ca28bcff336b6860 Signed-off-by: Jitao Shi Reviewed-on: https://chromium-review.googlesource.com/371718 Commit-Ready: Nicolas Boichat Tested-by: jitao shi Reviewed-by: Julius Werner 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 884b46af5f..c26c6effb7 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);