From 54aa89c7b4ea793f49f6cfe73e13b4ce71dd138f Mon Sep 17 00:00:00 2001 From: Jitao Shi Date: Wed, 17 Aug 2016 10:21:37 +0800 Subject: 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 Reviewed-on: https://review.coreboot.org/16364 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/drivers/parade/ps8640/ps8640.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) (limited to 'src/drivers/parade') diff --git a/src/drivers/parade/ps8640/ps8640.c b/src/drivers/parade/ps8640/ps8640.c index 884b46af5f35..c26c6effb74b 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); -- cgit v1.2.3