drm/i915: Changes required to enable DSI Video Mode on CHT

On CHT, changes are required for calculating the correct m,n & p with
minimal error +/- for the required DSI clock, so that the correct
dividor & ctrl values are written in cck regs for DSI. This patch has
been tested on CHT RVP with 1200 x 1920 panel.

v2 by Jani, rebased on earlier refactoring, original at [1].

[1] http://mid.gmane.org/1431368400-1942-5-git-send-email-rodrigo.vivi@intel.com

Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c
index be0c1e2..c6a8975 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dsi_pll.c
+++ b/drivers/gpu/drm/i915/intel_dsi_pll.c
@@ -157,11 +157,13 @@ static u32 dsi_clk_from_pclk(u32 pclk, int pixel_format, int lane_count)
 
 #endif
 
-static int dsi_calc_mnp(int target_dsi_clk, struct dsi_mnp *dsi_mnp)
+static int dsi_calc_mnp(struct drm_i915_private *dev_priv,
+                       struct dsi_mnp *dsi_mnp, int target_dsi_clk)
 {
        unsigned int calc_m = 0, calc_p = 0;
-       unsigned int m, n = 1, p;
-       int ref_clk = 25000;
+       unsigned int m_min, m_max, p_min = 2, p_max = 6;
+       unsigned int m, n, p;
+       int ref_clk;
        int delta = target_dsi_clk;
        u32 m_seed;
 
@@ -171,8 +173,20 @@ static int dsi_calc_mnp(int target_dsi_clk, struct dsi_mnp *dsi_mnp)
                return -ECHRNG;
        }
 
-       for (m = 62; m <= 92 && delta; m++) {
-               for (p = 2; p <= 6 && delta; p++) {
+       if (IS_CHERRYVIEW(dev_priv)) {
+               ref_clk = 100000;
+               n = 4;
+               m_min = 70;
+               m_max = 96;
+       } else {
+               ref_clk = 25000;
+               n = 1;
+               m_min = 62;
+               m_max = 92;
+       }
+
+       for (m = m_min; m <= m_max && delta; m++) {
+               for (p = p_min; p <= p_max && delta; p++) {
                        /*
                         * Find the optimal m and p divisors with minimal delta
                         * +/- the required clock
@@ -212,7 +226,7 @@ static void vlv_configure_dsi_pll(struct intel_encoder *encoder)
        dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format,
                                    intel_dsi->lane_count);
 
-       ret = dsi_calc_mnp(dsi_clk, &dsi_mnp);
+       ret = dsi_calc_mnp(dev_priv, &dsi_mnp, dsi_clk);
        if (ret) {
                DRM_DEBUG_KMS("dsi_calc_mnp failed\n");
                return;