zen/zenxfi: don't switch emi on cpu change to avoid screen flicker

On those targets, since the LCDIF cannot recover from underflow, changing the
EMI frequency kills one frame and cause flicker.

Change-Id: Id3c130636bcfddcc6c54896602699fbaa1636ab4

1 files changed, 14 insertions, 4 deletions

diff --git a/firmware/target/arm/imx233/system-imx233.c b/firmware/target/arm/imx233/system-imx233.c
index 3cac826319..f34eab66e2 100644
--- a/firmware/target/arm/imx233/system-imx233.c
+++ b/firmware/target/arm/imx233/system-imx233.c
@@ -263,17 +263,27 @@ struct cpufreq_profile_t
     int arm_cache_timings;
 };
 
+/* Some devices don't handle very well memory frequency changes, so avoid them
+ * by running at highest speed at all time */
+#if defined(CREATIVE_ZEN) || defined(CREATIVE_ZENXFI)
+#define EMIFREQ_NORMAL  IMX233_EMIFREQ_130_MHz
+#define EMIFREQ_MAX     IMX233_EMIFREQ_130_MHz
+#else /* weird targets */
+#define EMIFREQ_NORMAL  IMX233_EMIFREQ_64_MHz
+#define EMIFREQ_MAX     IMX233_EMIFREQ_130_MHz
+#endif
+
 #if IMX233_SUBTARGET >= 3700
 static struct cpufreq_profile_t cpu_profiles[] =
 {
     /* clk_p@454.74 MHz, clk_h@151.58 MHz, clk_emi@130.91 MHz, VDDD@1.550 V */
-    {IMX233_CPUFREQ_454_MHz, 1550, 1450, 3, 1, 19, IMX233_EMIFREQ_130_MHz, 0},
+    {IMX233_CPUFREQ_454_MHz, 1550, 1450, 3, 1, 19, EMIFREQ_MAX, 0},
     /* clk_p@320.00 MHz, clk_h@106.66 MHz, clk_emi@130.91 MHz, VDDD@1.450 V */
-    {IMX233_CPUFREQ_320_MHz, 1450, 1350, 3, 1, 27, IMX233_EMIFREQ_130_MHz, 0},
+    {IMX233_CPUFREQ_320_MHz, 1450, 1350, 3, 1, 27, EMIFREQ_MAX, 0},
     /* clk_p@261.82 MHz, clk_h@130.91 MHz, clk_emi@130.91 MHz, VDDD@1.275 V */
-    {IMX233_CPUFREQ_261_MHz, 1275, 1175, 2, 1, 33, IMX233_EMIFREQ_130_MHz, 0},
+    {IMX233_CPUFREQ_261_MHz, 1275, 1175, 2, 1, 33, EMIFREQ_MAX, 0},
     /* clk_p@64 MHz, clk_h@64 MHz, clk_emi@64 MHz, VDDD@1.050 V */
-    {IMX233_CPUFREQ_64_MHz, 1050, 975, 1, 5, 27, IMX233_EMIFREQ_64_MHz, 3},
+    {IMX233_CPUFREQ_64_MHz, 1050, 975, 1, 5, 27, EMIFREQ_NORMAL, 3},
     /* dummy */
     {0, 0, 0, 0, 0, 0, 0, 0}
 };