memory/atmel-ebi: Fix ns <-> cycles conversions

commit ee194289502a6901cc77dc9a893bf2afd351ac5e upstream.

at91sam9_ebi_get_config() is incorrectly converting timings in clock
cycles into timings in nanoseconds by multiplying the cycle values by
the clk rate instead of the clk period.

at91sam9_ebi_xslate_config() has the same problem for the
tdf_ns -> tdf_cycles conversion.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reported-by: Chris Leahy <leahycm@gmail.com>
Fixes: 6a4ec4cd0888 ("memory: add Atmel EBI (External Bus Interface) driver")
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 14 insertions, 13 deletions

diff --git a/drivers/memory/atmel-ebi.c b/drivers/memory/atmel-ebi.c
index b5ed3bd082b5..e9ebc4f31d16 100644
--- a/drivers/memory/atmel-ebi.c
+++ b/drivers/memory/atmel-ebi.c
@@ -93,7 +93,7 @@ static void at91sam9_ebi_get_config(struct at91_ebi_dev *ebid,
                                     struct at91_ebi_dev_config *conf)
 {
         struct at91sam9_smc_generic_fields *fields = &ebid->ebi->sam9;
-        unsigned int clk_rate = clk_get_rate(ebid->ebi->clk);
+        unsigned int clk_period = NSEC_PER_SEC / clk_get_rate(ebid->ebi->clk);
         struct at91sam9_ebi_dev_config *config = &conf->sam9;
         struct at91sam9_smc_timings *timings = &config->timings;
         unsigned int val;
@@ -102,43 +102,43 @@ static void at91sam9_ebi_get_config(struct at91_ebi_dev *ebid,
         config->mode = val & ~AT91_SMC_TDF;
 
         val = (val & AT91_SMC_TDF) >> 16;
-        timings->tdf_ns = clk_rate * val;
+        timings->tdf_ns = clk_period * val;
 
         regmap_fields_read(fields->setup, conf->cs, &val);
         timings->ncs_rd_setup_ns = (val >> 24) & 0x1f;
         timings->ncs_rd_setup_ns += ((val >> 29) & 0x1) * 128;
-        timings->ncs_rd_setup_ns *= clk_rate;
+        timings->ncs_rd_setup_ns *= clk_period;
         timings->nrd_setup_ns = (val >> 16) & 0x1f;
         timings->nrd_setup_ns += ((val >> 21) & 0x1) * 128;
-        timings->nrd_setup_ns *= clk_rate;
+        timings->nrd_setup_ns *= clk_period;
         timings->ncs_wr_setup_ns = (val >> 8) & 0x1f;
         timings->ncs_wr_setup_ns += ((val >> 13) & 0x1) * 128;
-        timings->ncs_wr_setup_ns *= clk_rate;
+        timings->ncs_wr_setup_ns *= clk_period;
         timings->nwe_setup_ns = val & 0x1f;
         timings->nwe_setup_ns += ((val >> 5) & 0x1) * 128;
-        timings->nwe_setup_ns *= clk_rate;
+        timings->nwe_setup_ns *= clk_period;
 
         regmap_fields_read(fields->pulse, conf->cs, &val);
         timings->ncs_rd_pulse_ns = (val >> 24) & 0x3f;
         timings->ncs_rd_pulse_ns += ((val >> 30) & 0x1) * 256;
-        timings->ncs_rd_pulse_ns *= clk_rate;
+        timings->ncs_rd_pulse_ns *= clk_period;
         timings->nrd_pulse_ns = (val >> 16) & 0x3f;
         timings->nrd_pulse_ns += ((val >> 22) & 0x1) * 256;
-        timings->nrd_pulse_ns *= clk_rate;
+        timings->nrd_pulse_ns *= clk_period;
         timings->ncs_wr_pulse_ns = (val >> 8) & 0x3f;
         timings->ncs_wr_pulse_ns += ((val >> 14) & 0x1) * 256;
-        timings->ncs_wr_pulse_ns *= clk_rate;
+        timings->ncs_wr_pulse_ns *= clk_period;
         timings->nwe_pulse_ns = val & 0x3f;
         timings->nwe_pulse_ns += ((val >> 6) & 0x1) * 256;
-        timings->nwe_pulse_ns *= clk_rate;
+        timings->nwe_pulse_ns *= clk_period;
 
         regmap_fields_read(fields->cycle, conf->cs, &val);
         timings->nrd_cycle_ns = (val >> 16) & 0x7f;
         timings->nrd_cycle_ns += ((val >> 23) & 0x3) * 256;
-        timings->nrd_cycle_ns *= clk_rate;
+        timings->nrd_cycle_ns *= clk_period;
         timings->nwe_cycle_ns = val & 0x7f;
         timings->nwe_cycle_ns += ((val >> 7) & 0x3) * 256;
-        timings->nwe_cycle_ns *= clk_rate;
+        timings->nwe_cycle_ns *= clk_period;
 }
 
 static int at91_xlate_timing(struct device_node *np, const char *prop,
@@ -334,6 +334,7 @@ static int at91sam9_ebi_apply_config(struct at91_ebi_dev *ebid,
                                      struct at91_ebi_dev_config *conf)
 {
         unsigned int clk_rate = clk_get_rate(ebid->ebi->clk);
+        unsigned int clk_period = NSEC_PER_SEC / clk_rate;
         struct at91sam9_ebi_dev_config *config = &conf->sam9;
         struct at91sam9_smc_timings *timings = &config->timings;
         struct at91sam9_smc_generic_fields *fields = &ebid->ebi->sam9;
@@ -376,7 +377,7 @@ static int at91sam9_ebi_apply_config(struct at91_ebi_dev *ebid,
         val |= AT91SAM9_SMC_NWECYCLE(coded_val);
         regmap_fields_write(fields->cycle, conf->cs, val);
 
-        val = DIV_ROUND_UP(timings->tdf_ns, clk_rate);
+        val = DIV_ROUND_UP(timings->tdf_ns, clk_period);
         if (val > AT91_SMC_TDF_MAX)
                 val = AT91_SMC_TDF_MAX;
         regmap_fields_write(fields->mode, conf->cs,