[PATCH 1/2] ddr: imx8m: warn about unsupported frequencies

Ahmad Fatoum a.fatoum at pengutronix.de
Mon Dec 5 05:28:34 PST 2022

When adding a new board with a yet unsupported DDR frequency, PLL
configuration is silently skipped, leading to a later hang during DDRC
configuration. Improve the bring up user experience by printing a
warning in that case. The user is then expected to extend
imx8mm_fracpll_table, so PBL knows how PLLs should be configured for
this new frequency.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
 drivers/ddr/imx8m/ddrphy_utils.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/ddr/imx8m/ddrphy_utils.c b/drivers/ddr/imx8m/ddrphy_utils.c
index c5d94e305086..3e03d4b75c9e 100644
--- a/drivers/ddr/imx8m/ddrphy_utils.c
+++ b/drivers/ddr/imx8m/ddrphy_utils.c
@@ -344,6 +344,7 @@ void ddrphy_init_set_dfi_clk(unsigned int drate_mhz, enum ddrc_type type)
 	case 400: drate = DDR_400; break;
 	case 100: drate = DDR_100; break;
+		pr_warn("Unsupported frequency %u\n", drate_mhz);

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