From 8ba96b91dc1559c5a88bad5b4384885d3b384f11 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Michael=20Niew=C3=B6hner?= Date: Sat, 19 Dec 2020 22:22:32 +0100 Subject: soc/intel/apl/graphics: add missing left-shift MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit According to doc# IHD-OS-BXT-Vol 2b-05.17 the cycle delay is in the bit range 8:4 of register PP_CONTROL. The current code writes the value to bits 4:0, though. Correct that by shifting the value left by 4 bits. Change-Id: If407932c847da39b19e307368c9e52ba1c93bccd Signed-off-by: Michael Niewöhner Reviewed-on: https://review.coreboot.org/c/coreboot/+/48759 Tested-by: build bot (Jenkins) Reviewed-by: Nico Huber --- src/soc/intel/apollolake/graphics.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'src') diff --git a/src/soc/intel/apollolake/graphics.c b/src/soc/intel/apollolake/graphics.c index 24d47721ab..be13b5b825 100644 --- a/src/soc/intel/apollolake/graphics.c +++ b/src/soc/intel/apollolake/graphics.c @@ -17,7 +17,8 @@ static void graphics_configure_panelpower( const unsigned int offset = panel_idx * 0x100; uint32_t reg32; - reg32 = ((DIV_ROUND_UP(pp->cycle_delay_ms, 100) + 1) & 0x1f) | PANEL_POWER_RESET; + reg32 = (DIV_ROUND_UP(pp->cycle_delay_ms, 100) + 1) << 4 & 0x1f0; + reg32 |= PANEL_POWER_RESET; write32(mmio + PCH_PP_CONTROL + offset, reg32); reg32 = pp->up_delay_ms * 10 << 16; -- cgit v1.2.3