From mboxrd@z Thu Jan 1 00:00:00 1970 From: Simon Glass Date: Mon, 22 May 2017 05:17:29 -0600 Subject: [U-Boot] [PATCH 09/12] tegra: video: Don't power up the SOR twice In-Reply-To: <20170522111732.11265-1-sjg@chromium.org> References: <20170522111732.11265-1-sjg@chromium.org> Message-ID: <20170522111732.11265-10-sjg@chromium.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de If U-Boot is the secondary boot loader, or has been run from itself, the SOR may already be powered up. Powering it up again causes a hang, so detect this situation and skip it. Signed-off-by: Simon Glass --- drivers/video/tegra124/sor.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/video/tegra124/sor.c b/drivers/video/tegra124/sor.c index 1f5e572bda..700ab25d46 100644 --- a/drivers/video/tegra124/sor.c +++ b/drivers/video/tegra124/sor.c @@ -466,11 +466,20 @@ void tegra_dc_sor_set_lane_count(struct udevice *dev, u8 lane_count) static int tegra_dc_sor_power_up(struct udevice *dev, int is_lvds) { struct tegra_dc_sor_data *sor = dev_get_priv(dev); + u32 reg; int ret; if (sor->power_is_up) return 0; + /* + * If for some reason it is already powered up, don't do it again. + * This can happen if U-Boot is the secondary boot loader. + */ + reg = tegra_sor_readl(sor, DP_PADCTL(sor->portnum)); + if (reg & DP_PADCTL_PD_TXD_0_NO) + return 0; + /* Set link bw */ tegra_dc_sor_set_link_bandwidth(dev, is_lvds ? CLK_CNTRL_DP_LINK_SPEED_LVDS : -- 2.13.0.303.g4ebf302169-goog