From 91a49481af7332853c4c921d46aded8210572210 Mon Sep 17 00:00:00 2001 From: Claudiu Beznea Date: Mon, 11 Oct 2021 14:27:17 +0300 Subject: [PATCH 245/247] clk: at91: sama7g5: remove prescaler part of master clock On SAMA7G5 the prescaler part of master clock has been implemented as a changeable one. Everytime the prescaler is changed the PMC_SR.MCKRDY bit must be polled. Value 1 for PMC_SR.MCKRDY means the prescaler update is done. Driver polls for this bit until it becomes 1. On SAMA7G5 it has been discovered that in some conditions the PMC_SR.MCKRDY is not rising but the rate it provides it's stable. The workaround is to add a timeout when polling for PMC_SR.MCKRDY. At the moment, for SAMA7G5, the prescaler will be removed from Linux clock tree as all the frequencies for CPU could be obtained from PLL and also there will be less overhead when changing frequency via DVFS. Signed-off-by: Claudiu Beznea Link: https://lore.kernel.org/r/20211011112719.3951784-14-claudiu.beznea@microchip.com Acked-by: Nicolas Ferre Signed-off-by: Stephen Boyd --- drivers/clk/at91/sama7g5.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) --- a/drivers/clk/at91/sama7g5.c +++ b/drivers/clk/at91/sama7g5.c @@ -992,16 +992,7 @@ static void __init sama7g5_pmc_setup(str } parent_names[0] = "cpupll_divpmcck"; - hw = at91_clk_register_master_pres(regmap, "cpuck", 1, parent_names, - &mck0_layout, &mck0_characteristics, - &pmc_mck0_lock, - CLK_SET_RATE_PARENT, 0); - if (IS_ERR(hw)) - goto err_free; - - sama7g5_pmc->chws[PMC_CPU] = hw; - - hw = at91_clk_register_master_div(regmap, "mck0", "cpuck", + hw = at91_clk_register_master_div(regmap, "mck0", "cpupll_divpmcck", &mck0_layout, &mck0_characteristics, &pmc_mck0_lock, CLK_GET_RATE_NOCACHE, 5); if (IS_ERR(hw))