sun6i: display: Add support for using the mipi pll as lcd clock source

Add support for using the mipi pll as lcd clock source, this is
necessary for getting higher dotclocks with lcd panels.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: Anatolij Gustschin <agust@denx.de>

diff --git a/drivers/video/sunxi_display.c b/drivers/video/sunxi_display.c
index f5deca35abc5bff90b9a11c3bdccd83ac3e91f04..06ed5c760318a765d0f30489569601f0f2a62269 100644 (file)
--- a/drivers/video/sunxi_display.c
+++ b/drivers/video/sunxi_display.c
@@ -521,6 +521,7 @@ static void sunxi_lcdc_pll_set(int tcon, int dotclock,
        int value, n, m, min_m, max_m, diff;
        int best_n = 0, best_m = 0, best_diff = 0x0FFFFFFF;
        int best_double = 0;
+       bool use_mipi_pll = false;
 
        if (tcon == 0) {
 #ifdef CONFIG_VIDEO_LCD_IF_PARALLEL
@@ -571,16 +572,42 @@ static void sunxi_lcdc_pll_set(int tcon, int dotclock,
                }
        }
 
-       debug("dotclock: %dkHz = %dkHz: (%d * 3MHz * %d) / %d\n",
-             dotclock, (best_double + 1) * 3000 * best_n / best_m,
-             best_double + 1, best_n, best_m);
+#ifdef CONFIG_MACH_SUN6I
+       /*
+        * Use the MIPI pll if we've been unable to find any matching setting
+        * for PLL3, this happens with high dotclocks because of min_m = 6.
+        */
+       if (tcon == 0 && best_n == 0) {
+               use_mipi_pll = true;
+               best_m = 6;  /* Minimum m for tcon0 */
+       }
 
-       clock_set_pll3(best_n * 3000000);
+       if (use_mipi_pll) {
+               clock_set_pll3(297000000); /* Fix the video pll at 297 MHz */
+               clock_set_mipi_pll(best_m * dotclock * 1000);
+               debug("dotclock: %dkHz = %dkHz via mipi pll\n",
+                     dotclock, clock_get_mipi_pll() / best_m / 1000);
+       } else
+#endif
+       {
+               clock_set_pll3(best_n * 3000000);
+               debug("dotclock: %dkHz = %dkHz: (%d * 3MHz * %d) / %d\n",
+                     dotclock,
+                     (best_double + 1) * clock_get_pll3() / best_m / 1000,
+                     best_double + 1, best_n, best_m);
+       }
 
        if (tcon == 0) {
-               writel(CCM_LCD_CH0_CTRL_GATE | CCM_LCD_CH0_CTRL_RST |
-                      (best_double ? CCM_LCD_CH0_CTRL_PLL3_2X :
-                                     CCM_LCD_CH0_CTRL_PLL3),
+               u32 pll;
+
+               if (use_mipi_pll)
+                       pll = CCM_LCD_CH0_CTRL_MIPI_PLL;
+               else if (best_double)
+                       pll = CCM_LCD_CH0_CTRL_PLL3_2X;
+               else
+                       pll = CCM_LCD_CH0_CTRL_PLL3;
+
+               writel(CCM_LCD_CH0_CTRL_GATE | CCM_LCD_CH0_CTRL_RST | pll,
                       &ccm->lcd0_ch0_clk_cfg);
        } else {
                writel(CCM_LCD_CH1_CTRL_GATE |