clk: qcom: Allow clk_set_parent() to work on display clocks

Sometimes the display driver may want to change the parent PLL of
the display clocks (byte and pixel clocks) depending on the
use-case. Currently the parent is fixed by means of having a
frequency table with one entry that chooses a particular parent.
Remove this restriction and use the parent the clock is
configured for in the hardware during clk_set_rate(). This
requires consumers to rely on the default parent or to configure
the parent with clk_set_parent()/assigned-clock-parents on the
clocks before calling clk_set_rate().

Tested-by: Archit Taneja <architt@codeaurora.org>
Cc: Hai Li <hali@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h
index 56028bb..31f92d7 100644 (file)
--- a/drivers/clk/qcom/clk-rcg.h
+++ b/drivers/clk/qcom/clk-rcg.h
@@ -171,6 +171,7 @@ struct clk_rcg2 {
 extern const struct clk_ops clk_rcg2_ops;
 extern const struct clk_ops clk_edp_pixel_ops;
 extern const struct clk_ops clk_byte_ops;
+extern const struct clk_ops clk_byte2_ops;
 extern const struct clk_ops clk_pixel_ops;
 
 #endif

diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index 9aec176..d941dea 100644 (file)
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -485,6 +485,76 @@ const struct clk_ops clk_byte_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_byte_ops);
 
+static int clk_byte2_determine_rate(struct clk_hw *hw,
+                                   struct clk_rate_request *req)
+{
+       struct clk_rcg2 *rcg = to_clk_rcg2(hw);
+       unsigned long parent_rate, div;
+       u32 mask = BIT(rcg->hid_width) - 1;
+       struct clk_hw *p;
+       unsigned long rate = req->rate;
+
+       if (rate == 0)
+               return -EINVAL;
+
+       p = req->best_parent_hw;
+       req->best_parent_rate = parent_rate = clk_hw_round_rate(p, rate);
+
+       div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
+       div = min_t(u32, div, mask);
+
+       req->rate = calc_rate(parent_rate, 0, 0, 0, div);
+
+       return 0;
+}
+
+static int clk_byte2_set_rate(struct clk_hw *hw, unsigned long rate,
+                        unsigned long parent_rate)
+{
+       struct clk_rcg2 *rcg = to_clk_rcg2(hw);
+       struct freq_tbl f = { 0 };
+       unsigned long div;
+       int i, num_parents = clk_hw_get_num_parents(hw);
+       u32 mask = BIT(rcg->hid_width) - 1;
+       u32 cfg;
+
+       div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
+       div = min_t(u32, div, mask);
+
+       f.pre_div = div;
+
+       regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
+       cfg &= CFG_SRC_SEL_MASK;
+       cfg >>= CFG_SRC_SEL_SHIFT;
+
+       for (i = 0; i < num_parents; i++) {
+               if (cfg == rcg->parent_map[i].cfg) {
+                       f.src = rcg->parent_map[i].src;
+                       return clk_rcg2_configure(rcg, &f);
+               }
+       }
+
+       return -EINVAL;
+}
+
+static int clk_byte2_set_rate_and_parent(struct clk_hw *hw,
+               unsigned long rate, unsigned long parent_rate, u8 index)
+{
+       /* Read the hardware to determine parent during set_rate */
+       return clk_byte2_set_rate(hw, rate, parent_rate);
+}
+
+const struct clk_ops clk_byte2_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_byte2_set_rate,
+       .set_rate_and_parent = clk_byte2_set_rate_and_parent,
+       .determine_rate = clk_byte2_determine_rate,
+};
+EXPORT_SYMBOL_GPL(clk_byte2_ops);
+
 static const struct frac_entry frac_table_pixel[] = {
        { 3, 8 },
        { 2, 9 },
@@ -496,14 +566,9 @@ static const struct frac_entry frac_table_pixel[] = {
 static int clk_pixel_determine_rate(struct clk_hw *hw,
                                    struct clk_rate_request *req)
 {
-       struct clk_rcg2 *rcg = to_clk_rcg2(hw);
        unsigned long request, src_rate;
        int delta = 100000;
-       const struct freq_tbl *f = rcg->freq_tbl;
        const struct frac_entry *frac = frac_table_pixel;
-       int index = qcom_find_src_index(hw, rcg->parent_map, f->src);
-
-       req->best_parent_hw = clk_hw_get_parent_by_index(hw, index);
 
        for (; frac->num; frac++) {
                request = (req->rate * frac->den) / frac->num;
@@ -525,12 +590,23 @@ static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
                unsigned long parent_rate)
 {
        struct clk_rcg2 *rcg = to_clk_rcg2(hw);
-       struct freq_tbl f = *rcg->freq_tbl;
+       struct freq_tbl f = { 0 };
        const struct frac_entry *frac = frac_table_pixel;
        unsigned long request;
        int delta = 100000;
        u32 mask = BIT(rcg->hid_width) - 1;
-       u32 hid_div;
+       u32 hid_div, cfg;
+       int i, num_parents = clk_hw_get_num_parents(hw);
+
+       regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
+       cfg &= CFG_SRC_SEL_MASK;
+       cfg >>= CFG_SRC_SEL_SHIFT;
+
+       for (i = 0; i < num_parents; i++)
+               if (cfg == rcg->parent_map[i].cfg) {
+                       f.src = rcg->parent_map[i].src;
+                       break;
+               }
 
        for (; frac->num; frac++) {
                request = (rate * frac->den) / frac->num;
@@ -555,7 +631,6 @@ static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
 static int clk_pixel_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
                unsigned long parent_rate, u8 index)
 {
-       /* Parent index is set statically in frequency table */
        return clk_pixel_set_rate(hw, rate, parent_rate);
 }
 

diff --git a/drivers/clk/qcom/gcc-msm8916.c b/drivers/clk/qcom/gcc-msm8916.c
index 22a4e1e..3de2823 100644 (file)
--- a/drivers/clk/qcom/gcc-msm8916.c
+++ b/drivers/clk/qcom/gcc-msm8916.c
@@ -906,21 +906,15 @@ static struct clk_rcg2 gp3_clk_src = {
        },
 };
 
-static struct freq_tbl ftbl_gcc_mdss_byte0_clk[] = {
-       { .src = P_DSI0_PHYPLL_BYTE },
-       { }
-};
-
 static struct clk_rcg2 byte0_clk_src = {
        .cmd_rcgr = 0x4d044,
        .hid_width = 5,
        .parent_map = gcc_xo_gpll0a_dsibyte_map,
-       .freq_tbl = ftbl_gcc_mdss_byte0_clk,
        .clkr.hw.init = &(struct clk_init_data){
                .name = "byte0_clk_src",
                .parent_names = gcc_xo_gpll0a_dsibyte,
                .num_parents = 3,
-               .ops = &clk_byte_ops,
+               .ops = &clk_byte2_ops,
                .flags = CLK_SET_RATE_PARENT,
        },
 };
@@ -968,17 +962,11 @@ static struct clk_rcg2 mdp_clk_src = {
        },
 };
 
-static struct freq_tbl ftbl_gcc_mdss_pclk[] = {
-       { .src = P_DSI0_PHYPLL_DSI },
-       { }
-};
-
 static struct clk_rcg2 pclk0_clk_src = {
        .cmd_rcgr = 0x4d000,
        .mnd_width = 8,
        .hid_width = 5,
        .parent_map = gcc_xo_gpll0a_dsiphy_map,
-       .freq_tbl = ftbl_gcc_mdss_pclk,
        .clkr.hw.init = &(struct clk_init_data){
                .name = "pclk0_clk_src",
                .parent_names = gcc_xo_gpll0a_dsiphy,

diff --git a/drivers/clk/qcom/mmcc-apq8084.c b/drivers/clk/qcom/mmcc-apq8084.c
index f0ee6bd..5d2aab7 100644 (file)
--- a/drivers/clk/qcom/mmcc-apq8084.c
+++ b/drivers/clk/qcom/mmcc-apq8084.c
@@ -571,17 +571,11 @@ static struct clk_rcg2 jpeg2_clk_src = {
        },
 };
 
-static struct freq_tbl pixel_freq_tbl[] = {
-       { .src = P_DSI0PLL },
-       { }
-};
-
 static struct clk_rcg2 pclk0_clk_src = {
        .cmd_rcgr = 0x2000,
        .mnd_width = 8,
        .hid_width = 5,
        .parent_map = mmcc_xo_dsi_hdmi_edp_gpll0_map,
-       .freq_tbl = pixel_freq_tbl,
        .clkr.hw.init = &(struct clk_init_data){
                .name = "pclk0_clk_src",
                .parent_names = mmcc_xo_dsi_hdmi_edp_gpll0,
@@ -596,7 +590,6 @@ static struct clk_rcg2 pclk1_clk_src = {
        .mnd_width = 8,
        .hid_width = 5,
        .parent_map = mmcc_xo_dsi_hdmi_edp_gpll0_map,
-       .freq_tbl = pixel_freq_tbl,
        .clkr.hw.init = &(struct clk_init_data){
                .name = "pclk1_clk_src",
                .parent_names = mmcc_xo_dsi_hdmi_edp_gpll0,
@@ -844,21 +837,15 @@ static struct clk_rcg2 cpp_clk_src = {
        },
 };
 
-static struct freq_tbl byte_freq_tbl[] = {
-       { .src = P_DSI0PLL_BYTE },
-       { }
-};
-
 static struct clk_rcg2 byte0_clk_src = {
        .cmd_rcgr = 0x2120,
        .hid_width = 5,
        .parent_map = mmcc_xo_dsibyte_hdmi_edp_gpll0_map,
-       .freq_tbl = byte_freq_tbl,
        .clkr.hw.init = &(struct clk_init_data){
                .name = "byte0_clk_src",
                .parent_names = mmcc_xo_dsibyte_hdmi_edp_gpll0,
                .num_parents = 6,
-               .ops = &clk_byte_ops,
+               .ops = &clk_byte2_ops,
                .flags = CLK_SET_RATE_PARENT,
        },
 };
@@ -867,12 +854,11 @@ static struct clk_rcg2 byte1_clk_src = {
        .cmd_rcgr = 0x2140,
        .hid_width = 5,
        .parent_map = mmcc_xo_dsibyte_hdmi_edp_gpll0_map,
-       .freq_tbl = byte_freq_tbl,
        .clkr.hw.init = &(struct clk_init_data){
                .name = "byte1_clk_src",
                .parent_names = mmcc_xo_dsibyte_hdmi_edp_gpll0,
                .num_parents = 6,
-               .ops = &clk_byte_ops,
+               .ops = &clk_byte2_ops,
                .flags = CLK_SET_RATE_PARENT,
        },
 };

diff --git a/drivers/clk/qcom/mmcc-msm8974.c b/drivers/clk/qcom/mmcc-msm8974.c
index 0987bf4..197700e 100644 (file)
--- a/drivers/clk/qcom/mmcc-msm8974.c
+++ b/drivers/clk/qcom/mmcc-msm8974.c
@@ -522,17 +522,11 @@ static struct clk_rcg2 jpeg2_clk_src = {
        },
 };
 
-static struct freq_tbl pixel_freq_tbl[] = {
-       { .src = P_DSI0PLL },
-       { }
-};
-
 static struct clk_rcg2 pclk0_clk_src = {
        .cmd_rcgr = 0x2000,
        .mnd_width = 8,
        .hid_width = 5,
        .parent_map = mmcc_xo_dsi_hdmi_edp_gpll0_map,
-       .freq_tbl = pixel_freq_tbl,
        .clkr.hw.init = &(struct clk_init_data){
                .name = "pclk0_clk_src",
                .parent_names = mmcc_xo_dsi_hdmi_edp_gpll0,
@@ -547,7 +541,6 @@ static struct clk_rcg2 pclk1_clk_src = {
        .mnd_width = 8,
        .hid_width = 5,
        .parent_map = mmcc_xo_dsi_hdmi_edp_gpll0_map,
-       .freq_tbl = pixel_freq_tbl,
        .clkr.hw.init = &(struct clk_init_data){
                .name = "pclk1_clk_src",
                .parent_names = mmcc_xo_dsi_hdmi_edp_gpll0,
@@ -785,7 +778,7 @@ static struct clk_rcg2 byte0_clk_src = {
                .name = "byte0_clk_src",
                .parent_names = mmcc_xo_dsibyte_hdmi_edp_gpll0,
                .num_parents = 6,
-               .ops = &clk_byte_ops,
+               .ops = &clk_byte2_ops,
                .flags = CLK_SET_RATE_PARENT,
        },
 };
@@ -799,7 +792,7 @@ static struct clk_rcg2 byte1_clk_src = {
                .name = "byte1_clk_src",
                .parent_names = mmcc_xo_dsibyte_hdmi_edp_gpll0,
                .num_parents = 6,
-               .ops = &clk_byte_ops,
+               .ops = &clk_byte2_ops,
                .flags = CLK_SET_RATE_PARENT,
        },
 };