diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.9/950-0186-clk-bcm2835-Add-claim-clocks-property.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.9/950-0186-clk-bcm2835-Add-claim-clocks-property.patch | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.9/950-0186-clk-bcm2835-Add-claim-clocks-property.patch b/target/linux/brcm2708/patches-4.9/950-0186-clk-bcm2835-Add-claim-clocks-property.patch new file mode 100644 index 0000000000..09dcfa7a68 --- /dev/null +++ b/target/linux/brcm2708/patches-4.9/950-0186-clk-bcm2835-Add-claim-clocks-property.patch @@ -0,0 +1,133 @@ +From 5c1128ebe6c7a4af3f1784a640df7f3698233e9d Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Mon, 13 Feb 2017 17:20:08 +0000 +Subject: [PATCH] clk-bcm2835: Add claim-clocks property + +The claim-clocks property can be used to prevent PLLs and dividers +from being marked as critical. It contains a vector of clock IDs, +as defined by dt-bindings/clock/bcm2835.h. + +Use this mechanism to claim PLLD_DSI0, PLLD_DSI1, PLLH_AUX and +PLLH_PIX for the vc4_kms_v3d driver. + +Signed-off-by: Phil Elwell <phil@raspberrypi.org> +--- + arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts | 14 +++++++++ + drivers/clk/bcm/clk-bcm2835.c | 34 ++++++++++++++++++++-- + 2 files changed, 46 insertions(+), 2 deletions(-) + +--- a/arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts ++++ b/arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts +@@ -5,6 +5,8 @@ + /dts-v1/; + /plugin/; + ++#include <dt-bindings/clock/bcm2835.h> ++ + / { + compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709"; + +@@ -155,6 +157,18 @@ + }; + }; + ++ fragment@19 { ++ target = <&clocks>; ++ __overlay__ { ++ claim-clocks = < ++ BCM2835_PLLD_DSI0 ++ BCM2835_PLLD_DSI1 ++ BCM2835_PLLH_AUX ++ BCM2835_PLLH_PIX ++ >; ++ }; ++ }; ++ + __overrides__ { + cma-256 = <0>,"+0-1-2-3-4"; + cma-192 = <0>,"-0+1-2-3-4"; +--- a/drivers/clk/bcm/clk-bcm2835.c ++++ b/drivers/clk/bcm/clk-bcm2835.c +@@ -1298,6 +1298,8 @@ static const struct clk_ops bcm2835_vpu_ + .debug_init = bcm2835_clock_debug_init, + }; + ++static bool bcm2835_clk_is_claimed(const char *name); ++ + static struct clk_hw *bcm2835_register_pll(struct bcm2835_cprman *cprman, + const struct bcm2835_pll_data *data) + { +@@ -1314,6 +1316,9 @@ static struct clk_hw *bcm2835_register_p + init.ops = &bcm2835_pll_clk_ops; + init.flags = CLK_IGNORE_UNUSED; + ++ if (!bcm2835_clk_is_claimed(data->name)) ++ init.flags |= CLK_IS_CRITICAL; ++ + pll = kzalloc(sizeof(*pll), GFP_KERNEL); + if (!pll) + return NULL; +@@ -1367,8 +1372,10 @@ bcm2835_register_pll_divider(struct bcm2 + divider->div.table = NULL; + + if (!(cprman_read(cprman, data->cm_reg) & data->hold_mask)) { +- init.flags |= CLK_IS_CRITICAL; +- divider->div.flags |= CLK_IS_CRITICAL; ++ if (!bcm2835_clk_is_claimed(data->source_pll)) ++ init.flags |= CLK_IS_CRITICAL; ++ if (!bcm2835_clk_is_claimed(data->name)) ++ divider->div.flags |= CLK_IS_CRITICAL; + } + + divider->cprman = cprman; +@@ -2104,6 +2111,8 @@ static const struct bcm2835_clk_desc clk + .ctl_reg = CM_PERIICTL), + }; + ++static bool bcm2835_clk_claimed[ARRAY_SIZE(clk_desc_array)]; ++ + /* + * Permanently take a reference on the parent of the SDRAM clock. + * +@@ -2123,6 +2132,19 @@ static int bcm2835_mark_sdc_parent_criti + return clk_prepare_enable(parent); + } + ++static bool bcm2835_clk_is_claimed(const char *name) ++{ ++ int i; ++ ++ for (i = 0; i < ARRAY_SIZE(clk_desc_array); i++) { ++ const char *clk_name = *(const char **)(clk_desc_array[i].data); ++ if (!strcmp(name, clk_name)) ++ return bcm2835_clk_claimed[i]; ++ } ++ ++ return false; ++} ++ + static int bcm2835_clk_probe(struct platform_device *pdev) + { + struct device *dev = &pdev->dev; +@@ -2132,6 +2154,7 @@ static int bcm2835_clk_probe(struct plat + const struct bcm2835_clk_desc *desc; + const size_t asize = ARRAY_SIZE(clk_desc_array); + size_t i; ++ u32 clk_id; + int ret; + + cprman = devm_kzalloc(dev, sizeof(*cprman) + +@@ -2147,6 +2170,13 @@ static int bcm2835_clk_probe(struct plat + if (IS_ERR(cprman->regs)) + return PTR_ERR(cprman->regs); + ++ memset(bcm2835_clk_claimed, 0, sizeof(bcm2835_clk_claimed)); ++ for (i = 0; ++ !of_property_read_u32_index(pdev->dev.of_node, "claim-clocks", ++ i, &clk_id); ++ i++) ++ bcm2835_clk_claimed[clk_id]= true; ++ + memcpy(cprman->real_parent_names, cprman_parent_names, + sizeof(cprman_parent_names)); + of_clk_parent_fill(dev->of_node, cprman->real_parent_names, |