diff options
| author | John Zhao <john.zhao@intel.com> | 2019-05-23 16:22:21 -0700 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-05-29 20:07:26 +0000 |
| commit | 64fb5aa9c3e50a49d2ecc153ff8c597e203475bc (patch) | |
| tree | 8fddb316348b4277417feb5ced776ba479053ba5 | |
| parent | 3d90d3bfce7b3e2a885bb4722ecb3a5c127e2882 (diff) | |
| download | coreboot-64fb5aa9c3e50a49d2ecc153ff8c597e203475bc.tar.xz | |
soc/intel/common: Set GSPI clock value to prevent division by zero
Clang Static Analyzer version 8.0.0 detects the division by zero if
gspi_clk_mhz is initialized to 0. gspi_clk_mhz is referred to speed_mhz
in devicetree. Set gspi_clk_mhz to 1 if it is detected as 0 in order to
prevent the division by zero in DIV_ROUND_UP operation. Then the value
of (ref_clk_mhz - 1) will be fed into GSPI's Serial Clock Rate value.
TEST=Built and boot up to kernel.
Change-Id: I6a09474bff114c57d7a9c4c232bb636ff287e4d5
Signed-off-by: John Zhao <john.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32974
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
| -rw-r--r-- | src/soc/intel/common/block/gspi/gspi.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/soc/intel/common/block/gspi/gspi.c b/src/soc/intel/common/block/gspi/gspi.c index 7fd7d0f9ae..17532bf6db 100644 --- a/src/soc/intel/common/block/gspi/gspi.c +++ b/src/soc/intel/common/block/gspi/gspi.c @@ -434,9 +434,11 @@ static uint32_t gspi_get_clk_div(unsigned int gspi_bus) { const uint32_t ref_clk_mhz = CONFIG_SOC_INTEL_COMMON_BLOCK_GSPI_CLOCK_MHZ; - const uint32_t gspi_clk_mhz = gspi_get_bus_clk_mhz(gspi_bus); + uint32_t gspi_clk_mhz = gspi_get_bus_clk_mhz(gspi_bus); + + if (!gspi_clk_mhz) + gspi_clk_mhz = 1; - assert(gspi_clk_mhz != 0); assert(ref_clk_mhz != 0); return (DIV_ROUND_UP(ref_clk_mhz, gspi_clk_mhz) - 1) & SSCR0_SCR_MASK; } |