drm/omap: support type B PLL for DPI

Type A and B PLLs require a bit different calculations for the clock
rates. DPI driver supports only type A PLLs.

This patch adds support for the type B PLL.

Type B PLLs are simpler than type A, as type B can produce a good clock
for almost any rate. Thus we can just ask it to produce the pixel clock
and use one as LCK and PCK dividers.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/gpu/drm/omapdrm/dss/dpi.c b/drivers/gpu/drm/omapdrm/dss/dpi.c
index 7d70bfc..050ec4c 100644 (file)
--- a/drivers/gpu/drm/omapdrm/dss/dpi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dpi.c
@@ -217,22 +217,35 @@ static bool dpi_dsi_clk_calc(struct dpi_data *dpi, unsigned long pck,
                struct dpi_clk_calc_ctx *ctx)
 {
        unsigned long clkin;
-       unsigned long pll_min, pll_max;
 
        memset(ctx, 0, sizeof(*ctx));
        ctx->pll = dpi->pll;
        ctx->clkout_idx = dss_pll_get_clkout_idx_for_src(dpi->clk_src);
-       ctx->pck_min = pck - 1000;
-       ctx->pck_max = pck + 1000;
 
-       pll_min = 0;
-       pll_max = 0;
+       clkin = clk_get_rate(dpi->pll->clkin);
 
-       clkin = clk_get_rate(ctx->pll->clkin);
+       if (dpi->pll->hw->type == DSS_PLL_TYPE_A) {
+               unsigned long pll_min, pll_max;
 
-       return dss_pll_calc_a(ctx->pll, clkin,
-                       pll_min, pll_max,
-                       dpi_calc_pll_cb, ctx);
+               ctx->pck_min = pck - 1000;
+               ctx->pck_max = pck + 1000;
+
+               pll_min = 0;
+               pll_max = 0;
+
+               return dss_pll_calc_a(ctx->pll, clkin,
+                               pll_min, pll_max,
+                               dpi_calc_pll_cb, ctx);
+       } else { /* DSS_PLL_TYPE_B */
+               dss_pll_calc_b(dpi->pll, clkin, pck, &ctx->dsi_cinfo);
+
+               ctx->dispc_cinfo.lck_div = 1;
+               ctx->dispc_cinfo.pck_div = 1;
+               ctx->dispc_cinfo.lck = ctx->dsi_cinfo.clkout[0];
+               ctx->dispc_cinfo.pck = ctx->dispc_cinfo.lck;
+
+               return true;
+       }
 }
 
 static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)