New patch to review for coreboot: f078705 tegra124: display clock should be initialized before any access

[Marc Jones]

Marc Jones ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/7950

-gerrit

commit f078705d276b55285c11478ed28c1068e3d879ee
Author: Vince Hsu 
Date:   Fri May 16 12:46:02 2014 +0800

tegra124: display clock should be initialized before any access

We initialized the dc before the plld's initialization. So some
    of the dc init settings did not took effect. This patch moves
    the clock_display() before the dc init call.

BRANCH=None
    BUG=chrome-os-partner:28128
    TEST=Display works and system boots up on Nyan and Big

Original-Change-Id: If2c40e2526fdf7a6aa33a2684ba324bd0ec40e90
    Original-Signed-off-by: Vince Hsu 
    Original-Reviewed-on: https://chromium-review.googlesource.com/200413
    Original-Reviewed-by: Tom Warren 
    Original-Reviewed-by: Jimmy Zhang 
    Original-Reviewed-by: David Hendricks 
    Original-Reviewed-by: Hung-Te Lin 
    Original-Commit-Queue: David Hendricks 
    Original-Tested-by: David Hendricks 
    (cherry picked from commit dc3cc253c319c21772c30962d963ec9dfc4944a7)
    Signed-off-by: Marc Jones

Change-Id: I021290f4293c740666d460f73fecbe79146896a4
---
 src/soc/nvidia/tegra124/display.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/soc/nvidia/tegra124/display.c b/src/soc/nvidia/tegra124/display.c
index 898e9b3..9ad76f0 100644
--- a/src/soc/nvidia/tegra124/display.c
+++ b/src/soc/nvidia/tegra124/display.c
@@ -135,7 +135,7 @@ static int update_display_mode(struct display_controller *disp_ctrl,
           &disp_ctrl->disp.disp_clk_ctrl);
    printk(BIOS_DEBUG, "%s: PixelClock=%u, ShiftClockDiv=%u\n",
           __func__, config->pixel_clock, shift_clock_div);
-	return clock_display(config->pixel_clock * shift_clock_div * 2);
+	return 0;
 }

static void update_window(struct display_controller *disp_ctrl,
@@ -278,6 +278,15 @@ void display_startup(device_t dev)
     * light things up here once we're sure it's all working.
     */

+	/* The plld is programmed with the assumption of the SHIFT_CLK_DIVIDER
+	 * and PIXEL_CLK_DIVIDER are zero (divide by 1). See the
+	 * update_display_mode() for detail.
+	 */
+	if (clock_display(config->pixel_clock * 2)) {
+		printk(BIOS_ERR, "dc: clock init failed\n");
+		return;
+	};
+
    /* Init dc */
    if (tegra_dc_init(disp_ctrl)) {
    	printk(BIOS_ERR, "dc: init failed\n");