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 <martinroth@chromium.org> Original-Commit-Id: bc8c3d6f7cf0b2da693a465cf3845e8bbc53825a Original-Change-Id: I5c725eed8110ff9f545c1142ca28bcff336b6860 Original-Signed-off-by: Jitao Shi <jitao.shi@mediatek.com> Original-Reviewed-on: https://chromium-review.googlesource.com/371718 Original-Commit-Ready: Nicolas Boichat <drinkcat@chromium.org> Original-Tested-by: jitao shi <jitao.shi@mediatek.com> Original-Reviewed-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-by: Daniel Kurtz <djkurtz@chromium.org> Reviewed-on: https://review.coreboot.org/16364 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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1 changed files with 9 additions and 3 deletions
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@ -60,16 +60,22 @@ int ps8640_init(uint8_t bus, uint8_t chip)
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u8 set_vdo_done;
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struct stopwatch sw;
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stopwatch_init_msecs_expire(&sw, 350);
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mdelay(200);
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stopwatch_init_msecs_expire(&sw, 200);
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do {
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while (true) {
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i2c_readb(bus, chip + 2, PAGE2_GPIO_H, &set_vdo_done);
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if ((set_vdo_done & PS_GPIO9) == PS_GPIO9)
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break;
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if (stopwatch_expired(&sw)) {
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printk(BIOS_INFO, "Failed to init ps8640.\n");
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return -1;
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}
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} while ((set_vdo_done & PS_GPIO9) != PS_GPIO9);
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mdelay(20);
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}
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mdelay(50);
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i2c_writeb(bus, chip + 3, PAGE3_SET_ADD, VDO_CTL_ADD);
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i2c_writeb(bus, chip + 3, PAGE3_SET_VAL, VDO_DIS);
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i2c_writeb(bus, chip + 3, PAGE3_SET_ADD, VDO_CTL_ADD);
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