From: Geert Uytterhoeven Date: Fri, 5 Aug 2016 08:17:52 +0000 (+0200) Subject: spi: sh-msiof: Avoid invalid clock generator parameters X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c3ccf357c3d75bd2924e049b6a991f7c0c111068;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git spi: sh-msiof: Avoid invalid clock generator parameters The conversion from a look-up table to a calculation for clock generator parameters forgot to take into account that BRDV x 1/1 is valid only if BRPS is x 1/1 or x 1/2, leading to undefined behavior (e.g. arbitrary clock rates). This limitation is documented for the MSIOF module in all supported SH/R-Mobile and R-Car Gen2/Gen3 ARM SoCs. Tested on r8a7791/koelsch and r8a7795/salvator-x. Fixes: 65d5665bb260b034 ("spi: sh-msiof: Update calculation of frequency dividing") Signed-off-by: Geert Uytterhoeven Signed-off-by: Mark Brown --- diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c index 0f83ad1d5a58..1de3a772eb7d 100644 --- a/drivers/spi/spi-sh-msiof.c +++ b/drivers/spi/spi-sh-msiof.c @@ -262,6 +262,9 @@ static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p, for (k = 0; k < ARRAY_SIZE(sh_msiof_spi_div_table); k++) { brps = DIV_ROUND_UP(div, sh_msiof_spi_div_table[k].div); + /* SCR_BRDV_DIV_1 is valid only if BRPS is x 1/1 or x 1/2 */ + if (sh_msiof_spi_div_table[k].div == 1 && brps > 2) + continue; if (brps <= 32) /* max of brdv is 32 */ break; }