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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
commit03dd4cb26d967f9588437b0fc9cc0e8353322bb7 (patch)
treefa581f6dc1c0596391690d1f67eceef3af8246dc /drivers/clk/qcom/clk-rcg2.c
parentd4e493caf788ef44982e131ff9c786546904d934 (diff)
Linux-libre 4.5-gnu
Diffstat (limited to 'drivers/clk/qcom/clk-rcg2.c')
-rw-r--r--drivers/clk/qcom/clk-rcg2.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index b544bb302..a071bba80 100644
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -723,3 +723,90 @@ const struct clk_ops clk_pixel_ops = {
.determine_rate = clk_pixel_determine_rate,
};
EXPORT_SYMBOL_GPL(clk_pixel_ops);
+
+static int clk_gfx3d_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct clk_rate_request parent_req = { };
+ struct clk_hw *p2, *p8, *p9, *xo;
+ unsigned long p9_rate;
+ int ret;
+
+ xo = clk_hw_get_parent_by_index(hw, 0);
+ if (req->rate == clk_hw_get_rate(xo)) {
+ req->best_parent_hw = xo;
+ return 0;
+ }
+
+ p9 = clk_hw_get_parent_by_index(hw, 2);
+ p2 = clk_hw_get_parent_by_index(hw, 3);
+ p8 = clk_hw_get_parent_by_index(hw, 4);
+
+ /* PLL9 is a fixed rate PLL */
+ p9_rate = clk_hw_get_rate(p9);
+
+ parent_req.rate = req->rate = min(req->rate, p9_rate);
+ if (req->rate == p9_rate) {
+ req->rate = req->best_parent_rate = p9_rate;
+ req->best_parent_hw = p9;
+ return 0;
+ }
+
+ if (req->best_parent_hw == p9) {
+ /* Are we going back to a previously used rate? */
+ if (clk_hw_get_rate(p8) == req->rate)
+ req->best_parent_hw = p8;
+ else
+ req->best_parent_hw = p2;
+ } else if (req->best_parent_hw == p8) {
+ req->best_parent_hw = p2;
+ } else {
+ req->best_parent_hw = p8;
+ }
+
+ ret = __clk_determine_rate(req->best_parent_hw, &parent_req);
+ if (ret)
+ return ret;
+
+ req->rate = req->best_parent_rate = parent_req.rate;
+
+ return 0;
+}
+
+static int clk_gfx3d_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate, u8 index)
+{
+ struct clk_rcg2 *rcg = to_clk_rcg2(hw);
+ u32 cfg;
+ int ret;
+
+ /* Just mux it, we don't use the division or m/n hardware */
+ cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
+ ret = regmap_write(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, cfg);
+ if (ret)
+ return ret;
+
+ return update_config(rcg);
+}
+
+static int clk_gfx3d_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ /*
+ * We should never get here; clk_gfx3d_determine_rate() should always
+ * make us use a different parent than what we're currently using, so
+ * clk_gfx3d_set_rate_and_parent() should always be called.
+ */
+ return 0;
+}
+
+const struct clk_ops clk_gfx3d_ops = {
+ .is_enabled = clk_rcg2_is_enabled,
+ .get_parent = clk_rcg2_get_parent,
+ .set_parent = clk_rcg2_set_parent,
+ .recalc_rate = clk_rcg2_recalc_rate,
+ .set_rate = clk_gfx3d_set_rate,
+ .set_rate_and_parent = clk_gfx3d_set_rate_and_parent,
+ .determine_rate = clk_gfx3d_determine_rate,
+};
+EXPORT_SYMBOL_GPL(clk_gfx3d_ops);