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drm: bridge: dw-hdmi: Assert SVSRET before resetting the PHY 

According to the PHY IP core vendor, the SVSRET signal must be asserted
before resetting the PHY. Tests on RK3288 and R-Car Gen3 showed no
regression, the change should thus be safe.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170117082910.27023-20-laurent.pinchart+renesas@ideasonboard.com
This commit is contained in:
Laurent Pinchart 2017-01-17 10:29:09 +02:00 committed by Archit Taneja
parent 54d72737b0
commit 2668db3788
1 changed files with 5 additions and 5 deletions
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8
drivers/gpu/drm/bridge/dw-hdmi.c
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@ -986,6 +986,10 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi, int cscon)
/* gen2 pddq */
dw_hdmi_phy_gen2_pddq(hdmi, 1);
/* Leave low power consumption mode by asserting SVSRET. */
if (hdmi->phy->has_svsret)
dw_hdmi_phy_enable_svsret(hdmi, 1);
/* PHY reset. The reset signal is active high on Gen2 PHYs. */
hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
@ -1028,10 +1032,6 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi, int cscon)
dw_hdmi_phy_gen2_txpwron(hdmi, 1);
dw_hdmi_phy_gen2_pddq(hdmi, 0);
/* The DWC MHL and HDMI 2.0 PHYs need the SVSRET signal to be set. */
if (hdmi->phy->has_svsret)
dw_hdmi_phy_enable_svsret(hdmi, 1);
/* Wait for PHY PLL lock */
msec = 5;
do {