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phy: rockchip: samsung-hdptx: Prevent Inter-Pair Skew from exceeding the limits

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[ Upstream commit 51023cf6cc ]

Fixup PHY deskew FIFO to prevent the phase of D2 lane going ahead of
other lanes.  It's worth noting this might only happen when dealing with
HDMI 2.0 rates.

Fixes: 553be2830c ("phy: rockchip: Add Samsung HDMI/eDP Combo PHY driver")
Co-developed-by: Algea Cao <algea.cao@rock-chips.com>
Signed-off-by: Algea Cao <algea.cao@rock-chips.com>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20251028-phy-hdptx-fixes-v1-3-ecc642a59d94@collabora.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Cristian Ciocaltea
2025-10-28 10:00:56 +02:00
committed by Greg Kroah-Hartman
parent 348c9b3d47
commit fd6835c98e
1 changed files with 5 additions and 4 deletions
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9
drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
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@@ -668,13 +668,9 @@ static const struct reg_sequence rk_hdtpx_common_lane_init_seq[] = {
static const struct reg_sequence rk_hdtpx_tmds_lane_init_seq[] = {
REG_SEQ0(LANE_REG(0312), 0x00),
REG_SEQ0(LANE_REG(031e), 0x00),
REG_SEQ0(LANE_REG(0412), 0x00),
REG_SEQ0(LANE_REG(041e), 0x00),
REG_SEQ0(LANE_REG(0512), 0x00),
REG_SEQ0(LANE_REG(051e), 0x00),
REG_SEQ0(LANE_REG(0612), 0x00),
REG_SEQ0(LANE_REG(061e), 0x08),
REG_SEQ0(LANE_REG(0303), 0x2f),
REG_SEQ0(LANE_REG(0403), 0x2f),
REG_SEQ0(LANE_REG(0503), 0x2f),
@@ -687,6 +683,11 @@ static const struct reg_sequence rk_hdtpx_tmds_lane_init_seq[] = {
REG_SEQ0(LANE_REG(0406), 0x1c),
REG_SEQ0(LANE_REG(0506), 0x1c),
REG_SEQ0(LANE_REG(0606), 0x1c),
/* Keep Inter-Pair Skew in the limits */
REG_SEQ0(LANE_REG(031e), 0x02),
REG_SEQ0(LANE_REG(041e), 0x02),
REG_SEQ0(LANE_REG(051e), 0x02),
REG_SEQ0(LANE_REG(061e), 0x0a),
};
static struct tx_drv_ctrl tx_drv_ctrl_rbr[4][4] = {