diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0021-clk-bcm2835-Add-claim-clocks-property.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0021-clk-bcm2835-Add-claim-clocks-property.patch | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0021-clk-bcm2835-Add-claim-clocks-property.patch b/target/linux/bcm27xx/patches-5.4/950-0021-clk-bcm2835-Add-claim-clocks-property.patch new file mode 100644 index 0000000000..928fe23253 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0021-clk-bcm2835-Add-claim-clocks-property.patch @@ -0,0 +1,102 @@ +From b7c3fda0df5da90e87b037348c6d27f669c38388 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> +--- + drivers/clk/bcm/clk-bcm2835.c | 34 ++++++++++++++++++++++++++++++++-- + 1 file changed, 32 insertions(+), 2 deletions(-) + +--- a/drivers/clk/bcm/clk-bcm2835.c ++++ b/drivers/clk/bcm/clk-bcm2835.c +@@ -1295,6 +1295,8 @@ 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) + { +@@ -1311,6 +1313,9 @@ 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; +@@ -1364,8 +1369,10 @@ 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; +@@ -2173,6 +2180,8 @@ 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. + * +@@ -2192,6 +2201,19 @@ 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; +@@ -2202,6 +2224,7 @@ static int bcm2835_clk_probe(struct plat + const size_t asize = ARRAY_SIZE(clk_desc_array); + const struct cprman_plat_data *pdata; + size_t i; ++ u32 clk_id; + int ret; + + pdata = of_device_get_match_data(&pdev->dev); +@@ -2221,6 +2244,13 @@ 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, |