clk: imx: Mark dram pll on 8mm and 8mn with CLK_GET_RATE_NOCACHE

DRAM frequency switches are executed in firmware and can change the
configuration of the DRAM PLL outside linux. Mark these CLKs with
CLK_GET_RATE_NOCACHE so we always read back the PLL config registers and
recalculate rates.

In current DRAM frequency tables on 8mm/8mn only the maximum frequency
uses the PLL so it's always configured in the same way. However reading
back the PLL configuration is the correct behavior and allows additional
setpoints in the future.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/drivers/clk/imx/clk-imx8mm.c b/drivers/clk/imx/clk-imx8mm.c
index e2bc3c9..9246e89 100644 (file)
--- a/drivers/clk/imx/clk-imx8mm.c
+++ b/drivers/clk/imx/clk-imx8mm.c
@@ -328,7 +328,7 @@ static int imx8mm_clocks_probe(struct platform_device *pdev)
        clks[IMX8MM_AUDIO_PLL1] = imx_clk_pll14xx("audio_pll1", "audio_pll1_ref_sel", base, &imx_1443x_pll);
        clks[IMX8MM_AUDIO_PLL2] = imx_clk_pll14xx("audio_pll2", "audio_pll2_ref_sel", base + 0x14, &imx_1443x_pll);
        clks[IMX8MM_VIDEO_PLL1] = imx_clk_pll14xx("video_pll1", "video_pll1_ref_sel", base + 0x28, &imx_1443x_pll);
-       clks[IMX8MM_DRAM_PLL] = imx_clk_pll14xx("dram_pll", "dram_pll_ref_sel", base + 0x50, &imx_1443x_pll);
+       clks[IMX8MM_DRAM_PLL] = imx_clk_pll14xx("dram_pll", "dram_pll_ref_sel", base + 0x50, &imx_1443x_dram_pll);
        clks[IMX8MM_GPU_PLL] = imx_clk_pll14xx("gpu_pll", "gpu_pll_ref_sel", base + 0x64, &imx_1416x_pll);
        clks[IMX8MM_VPU_PLL] = imx_clk_pll14xx("vpu_pll", "vpu_pll_ref_sel", base + 0x74, &imx_1416x_pll);
        clks[IMX8MM_ARM_PLL] = imx_clk_pll14xx("arm_pll", "arm_pll_ref_sel", base + 0x84, &imx_1416x_pll);

diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c
index de905e2..4749bea 100644 (file)
--- a/drivers/clk/imx/clk-imx8mn.c
+++ b/drivers/clk/imx/clk-imx8mn.c
@@ -325,7 +325,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
        clks[IMX8MN_AUDIO_PLL1] = imx_clk_pll14xx("audio_pll1", "audio_pll1_ref_sel", base, &imx_1443x_pll);
        clks[IMX8MN_AUDIO_PLL2] = imx_clk_pll14xx("audio_pll2", "audio_pll2_ref_sel", base + 0x14, &imx_1443x_pll);
        clks[IMX8MN_VIDEO_PLL1] = imx_clk_pll14xx("video_pll1", "video_pll1_ref_sel", base + 0x28, &imx_1443x_pll);
-       clks[IMX8MN_DRAM_PLL] = imx_clk_pll14xx("dram_pll", "dram_pll_ref_sel", base + 0x50, &imx_1443x_pll);
+       clks[IMX8MN_DRAM_PLL] = imx_clk_pll14xx("dram_pll", "dram_pll_ref_sel", base + 0x50, &imx_1443x_dram_pll);
        clks[IMX8MN_GPU_PLL] = imx_clk_pll14xx("gpu_pll", "gpu_pll_ref_sel", base + 0x64, &imx_1416x_pll);
        clks[IMX8MN_VPU_PLL] = imx_clk_pll14xx("vpu_pll", "vpu_pll_ref_sel", base + 0x74, &imx_1416x_pll);
        clks[IMX8MN_ARM_PLL] = imx_clk_pll14xx("arm_pll", "arm_pll_ref_sel", base + 0x84, &imx_1416x_pll);

diff --git a/drivers/clk/imx/clk-pll14xx.c b/drivers/clk/imx/clk-pll14xx.c
index 5c45819..a6d31a7 100644 (file)
--- a/drivers/clk/imx/clk-pll14xx.c
+++ b/drivers/clk/imx/clk-pll14xx.c
@@ -67,6 +67,13 @@ struct imx_pll14xx_clk imx_1443x_pll = {
        .rate_count = ARRAY_SIZE(imx_pll1443x_tbl),
 };
 
+struct imx_pll14xx_clk imx_1443x_dram_pll = {
+       .type = PLL_1443X,
+       .rate_table = imx_pll1443x_tbl,
+       .rate_count = ARRAY_SIZE(imx_pll1443x_tbl),
+       .flags = CLK_GET_RATE_NOCACHE,
+};
+
 struct imx_pll14xx_clk imx_1416x_pll = {
        .type = PLL_1416X,
        .rate_table = imx_pll1416x_tbl,

diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h
index bc5bb6a..81122c9 100644 (file)
--- a/drivers/clk/imx/clk.h
+++ b/drivers/clk/imx/clk.h
@@ -52,6 +52,7 @@ struct imx_pll14xx_clk {
 
 extern struct imx_pll14xx_clk imx_1416x_pll;
 extern struct imx_pll14xx_clk imx_1443x_pll;
+extern struct imx_pll14xx_clk imx_1443x_dram_pll;
 
 #define imx_clk_cpu(name, parent_name, div, mux, pll, step) \
        imx_clk_hw_cpu(name, parent_name, div, mux, pll, step)->clk