@@ -48,6 +48,7 @@ struct tegra_lcd_priv {
fdt_addr_t frame_buffer; /* Address of frame buffer */
unsigned pixel_clock; /* Pixel clock in Hz */
int dc_clk[2]; /* Contains clk and its parent */
+ ulong scdiv; /* Clock divider used by disp_clk_ctrl */
bool rotation; /* 180 degree panel turn */
bool pipe; /* DC controller: 0 for A, 1 for B */
};
@@ -126,8 +127,6 @@ static int update_display_mode(struct tegra_lcd_priv *priv)
struct dc_disp_reg *disp = &priv->dc->disp;
struct display_timing *dt = &priv->timing;
unsigned long val;
- unsigned long rate;
- unsigned long div;
writel(0x0, &disp->disp_timing_opt);
@@ -150,21 +149,11 @@ static int update_display_mode(struct tegra_lcd_priv *priv)
writel(val, &disp->disp_interface_ctrl);
}
- /*
- * The pixel clock divider is in 7.1 format (where the bottom bit
- * represents 0.5). Here we calculate the divider needed to get from
- * the display clock (typically 600MHz) to the pixel clock. We round
- * up or down as requried.
- */
- rate = clock_get_periph_rate(priv->dc_clk[0], priv->dc_clk[1]);
- div = ((rate * 2 + priv->pixel_clock / 2) / priv->pixel_clock) - 2;
- debug("Display clock %lu, divider %lu\n", rate, div);
-
if (priv->soc->has_rgb)
writel(0x00010001, &disp->shift_clk_opt);
val = PIXEL_CLK_DIVIDER_PCD1 << PIXEL_CLK_DIVIDER_SHIFT;
- val |= div << SHIFT_CLK_DIVIDER_SHIFT;
+ val |= priv->scdiv << SHIFT_CLK_DIVIDER_SHIFT;
writel(val, &disp->disp_clk_ctrl);
return 0;
@@ -314,6 +303,17 @@ static int tegra_display_probe(struct tegra_lcd_priv *priv,
rate /= 2;
#endif
+ /*
+ * The pixel clock divider is in 7.1 format (where the bottom bit
+ * represents 0.5). Here we calculate the divider needed to get from
+ * the display clock (typically 600MHz) to the pixel clock. We round
+ * up or down as required.
+ */
+ if (!priv->scdiv)
+ priv->scdiv = ((rate * 2 + priv->pixel_clock / 2)
+ / priv->pixel_clock) - 2;
+ debug("Display clock %lu, divider %lu\n", rate, priv->scdiv);
+
/*
* HOST1X is init by default at 150MHz with PLLC as parent
*/
@@ -390,6 +390,14 @@ static int tegra_lcd_probe(struct udevice *dev)
reset_deassert(&reset_ctl);
mdelay(4);
+ /* Get shift clock divider from Tegra DSI if used */
+ if (!strcmp(priv->panel->name, TEGRA_DSI_A) ||
+ !strcmp(priv->panel->name, TEGRA_DSI_B)) {
+ struct tegra_dc_plat *dc_plat = dev_get_plat(priv->panel);
+
+ priv->scdiv = dc_plat->scdiv;
+ }
+
if (tegra_display_probe(priv, (void *)plat->base)) {
debug("%s: Failed to probe display driver\n", __func__);
return -1;
@@ -23,6 +23,7 @@ struct tegra_dc_plat {
struct udevice *dev; /* Display controller device */
struct dc_ctlr *dc; /* Display controller regmap */
bool pipe; /* DC number: 0 for A, 1 for B */
+ ulong scdiv; /* Shift clock divider */
};
/* This holds information about a window which can be displayed */
@@ -743,6 +743,7 @@ static int tegra_dsi_panel_timings(struct udevice *dev,
static void tegra_dsi_init_clocks(struct udevice *dev)
{
struct tegra_dsi_priv *priv = dev_get_priv(dev);
+ struct tegra_dc_plat *dc_plat = dev_get_plat(dev);
struct mipi_dsi_device *device = &priv->device;
unsigned int mul, div;
unsigned long bclk, plld;
@@ -754,6 +755,19 @@ static void tegra_dsi_init_clocks(struct udevice *dev)
plld = DIV_ROUND_UP(bclk * 8, USEC_PER_SEC);
+ dc_plat->scdiv = ((plld * USEC_PER_SEC +
+ priv->timing.pixelclock.typ / 2) /
+ priv->timing.pixelclock.typ) - 2;
+
+ /*
+ * BUG: If DISP1 is a PLLD/D2 child, it cannot go over 370MHz. The
+ * cause of this is not quite clear. This can be overcomed by
+ * halving the PLLD/D2 if the target rate is > 800MHz. This way
+ * DISP1 and DSI clocks will be equal.
+ */
+ if (plld > 800)
+ plld /= 2;
+
switch (clock_get_osc_freq()) {
case CLOCK_OSC_FREQ_12_0: /* OSC is 12Mhz */
case CLOCK_OSC_FREQ_48_0: /* OSC is 48Mhz */