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MLK-23131-2 soc: imx: busfreq-imx8mq: Correct dram pll clock for rate update 

When DRAM PLL clock is changed in TF-A, the DRAM PLL clock rate needs
to be updated, previous implementation uses dram_pll_clk which is
clock gate and it will NOT trigger clock rate update, need to use PLL
type clock which has CLK_GET_RATE_NOCACHE flag set and will trigger
clock rate recalculation. Otherwise, when system enters low bus mode,
checking clock rate via "cat /sys/kernel/debug/clk/dram_core_clk/clk_rate"
will NOT return the latest dram core clk rate.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Robin Gong <yibin.gong@nxp.com>
5.4-rM2-2.2.x-imx-squashed
Anson Huang 2019-12-19 10:17:27 +08:00
parent c19e15747f
commit 7e99bce2f6
1 changed files with 5 additions and 3 deletions
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8
drivers/soc/imx/busfreq-imx8mq.c
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@ -61,6 +61,7 @@ static int low_bus_mode_fsp_index;
static bool bypass_support = true;
static struct clk *dram_pll_clk;
static struct clk *dram_pll;
static struct clk *sys1_pll_800m;
static struct clk *sys1_pll_400m;
static struct clk *sys1_pll_100m;
@ -135,7 +136,7 @@ static void reduce_bus_freq(void)
* to update the clock tree info in kernel side.
*/
clk_set_rate(dram_apb_pre_div, 160000000);
clk_get_rate(dram_pll_clk);
clk_get_rate(dram_pll);
}
/* change the NOC rate */
if (of_machine_is_compatible("fsl,imx8mq"))
@ -180,7 +181,7 @@ static void reduce_bus_freq(void)
* to update the clock tree info in kernel side.
*/
clk_set_rate(dram_apb_pre_div, 160000000);
clk_get_rate(dram_pll_clk);
clk_get_rate(dram_pll);
}
/* change the NOC rate */
@ -282,7 +283,7 @@ static int set_high_bus_freq(int high_bus_freq)
update_bus_freq(HIGH_FREQ_3200MTS);
clk_set_rate(dram_apb_pre_div, 200000000);
clk_get_rate(dram_pll_clk);
clk_get_rate(dram_pll);
}
clk_set_rate(noc_div, origin_noc_rate);
@ -508,6 +509,7 @@ static int imx8mq_init_busfreq_clk(struct platform_device *pdev)
static int imx8mm_init_busfreq_clk(struct platform_device *pdev)
{
dram_pll = devm_clk_get(&pdev->dev, "dram_pll_div");
dram_pll_clk = devm_clk_get(&pdev->dev, "dram_pll");
dram_alt_src = devm_clk_get(&pdev->dev, "dram_alt_src");
dram_alt_root = devm_clk_get(&pdev->dev, "dram_alt_root");