gru: Add USB 2.0 PHY tuning for Kevin
This patch sets some magic number in magic undocumented registers that are rumored to make USB 2.0 signal integrity better on Kevin. I don't see any difference (unfortunately it doesn't solve the problems with long cables on my board), but I guess it doesn't hurt either way. BRANCH=None BUG=chrome-os-partner:56108,chrome-os-partner:54788 TEST=Booted Kevin with USB connected through Servo. Seems to have roughly the same failure rate as before. Change-Id: If31fb49f1ed7218b50f24e251e54c9400db72720 Signed-off-by: Martin Roth <martinroth@chromium.org> Original-Commit-Id: 0c5c8f0f80ea1ebb042bcb91506a6100833e7e84 Original-Change-Id: Ifbd47bf6adb63a2ca5371c0b05c5ec27a0fe3195 Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/370900 Original-Reviewed-by: Guenter Roeck <groeck@chromium.org> Original-Reviewed-by: David Schneider <dnschneid@chromium.org> Reviewed-on: https://review.coreboot.org/16265 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
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Martin Roth
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@@ -158,6 +158,15 @@ static void configure_display(void)
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static void setup_usb(void)
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{
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/* A few magic PHY tuning values that improve eye diagram amplitude
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* and make it extra sure we get reliable communication in firmware. */
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/* Set max ODT compensation voltage and current tuning reference. */
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write32(&rk3399_grf->usbphy0_ctrl[3], 0x0fff02e3);
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write32(&rk3399_grf->usbphy1_ctrl[3], 0x0fff02e3);
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/* Set max pre-emphasis level, only on Kevin PHY0. */
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if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN))
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write32(&rk3399_grf->usbphy0_ctrl[12], 0xffff00a7);
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setup_usb_otg0();
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setup_usb_otg1();
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}
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@@ -73,7 +73,7 @@ struct rk3399_grf_regs {
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u32 reserved11[3];
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u32 usbphy0_ctrl[26];
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u32 reserved12[6];
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u32 usbphy1[26];
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u32 usbphy1_ctrl[26];
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u32 reserved13[0x72f];
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u32 soc_con9;
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u32 reserved14[0x0a];
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