diff options
| author | Chen-Yu Tsai <wens@csie.org> | 2017-08-08 10:02:44 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2017-08-30 15:01:50 +0300 |
| commit | a646113435c9c8862a36d459079c69953ad19e8f (patch) | |
| tree | b2ec01e77f06c3d052edee5841e155e3439dd56e /drivers | |
| parent | ac98caefe18ab845f4cef6612209212c669008ce (diff) | |
| download | linux-a646113435c9c8862a36d459079c69953ad19e8f.tar.xz | |
mmc: sunxi: Fix NULL pointer reference on clk_delays
Some SoCs do not support clk delays for MMC in the clock control unit.
These include the old controllers in A10/A10s/A13/R8, and the new eMMC
controller in A64. The config structure for these controllers do not
specify clk_delays, but the check for this was replaced in change
"mmc: sunxi: Support controllers that can use both old and new timings".
This patch adds back the check for clk_delays, and also adds comments
for both checks in sunxi_mmc_clk_set_phase().
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Tested-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/sunxi-mmc.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c index 3777517982dd..9dc6d726ec49 100644 --- a/drivers/mmc/host/sunxi-mmc.c +++ b/drivers/mmc/host/sunxi-mmc.c @@ -722,9 +722,14 @@ static int sunxi_mmc_clk_set_phase(struct sunxi_mmc_host *host, { int index; + /* clk controller delays not used under new timings mode */ if (host->use_new_timings) return 0; + /* some old controllers don't support delays */ + if (!host->cfg->clk_delays) + return 0; + /* determine delays */ if (rate <= 400000) { index = SDXC_CLK_400K; |