mtd: rawnand: Add a helper to find the closest ONFI NV-DDR mode

Introduce a similar helper to onfi_find_closest_sdr_mode(), but for
NV-DDR timings. It just takes a timing structure as parameter and
returns the closest mode by comparing all minimum timings. This is
useful for rigid controllers on which tuning the timings is not
possible.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-16-miquel.raynal@bootlin.com

diff --git a/drivers/mtd/nand/raw/internals.h b/drivers/mtd/nand/raw/internals.h
index 012876e..c06bc2f 100644 (file)
--- a/drivers/mtd/nand/raw/internals.h
+++ b/drivers/mtd/nand/raw/internals.h
@@ -90,6 +90,8 @@ void onfi_fill_interface_config(struct nand_chip *chip,
                                unsigned int timing_mode);
 unsigned int
 onfi_find_closest_sdr_mode(const struct nand_sdr_timings *spec_timings);
+unsigned int
+onfi_find_closest_nvddr_mode(const struct nand_nvddr_timings *spec_timings);
 int nand_choose_best_sdr_timings(struct nand_chip *chip,
                                 struct nand_interface_config *iface,
                                 struct nand_sdr_timings *spec_timings);

diff --git a/drivers/mtd/nand/raw/nand_timings.c b/drivers/mtd/nand/raw/nand_timings.c
index 8eaa132..7b41afc 100644 (file)
--- a/drivers/mtd/nand/raw/nand_timings.c
+++ b/drivers/mtd/nand/raw/nand_timings.c
@@ -601,6 +601,48 @@ onfi_find_closest_sdr_mode(const struct nand_sdr_timings *spec_timings)
 }
 
 /**
+ * onfi_find_closest_nvddr_mode - Derive the closest ONFI NVDDR timing mode
+ *                                given a set of timings
+ * @spec_timings: the timings to challenge
+ */
+unsigned int
+onfi_find_closest_nvddr_mode(const struct nand_nvddr_timings *spec_timings)
+{
+       const struct nand_nvddr_timings *onfi_timings;
+       int mode;
+
+       for (mode = ARRAY_SIZE(onfi_nvddr_timings) - 1; mode > 0; mode--) {
+               onfi_timings = &onfi_nvddr_timings[mode].timings.nvddr;
+
+               if (spec_timings->tCCS_min <= onfi_timings->tCCS_min &&
+                   spec_timings->tAC_min <= onfi_timings->tAC_min &&
+                   spec_timings->tADL_min <= onfi_timings->tADL_min &&
+                   spec_timings->tCAD_min <= onfi_timings->tCAD_min &&
+                   spec_timings->tCAH_min <= onfi_timings->tCAH_min &&
+                   spec_timings->tCALH_min <= onfi_timings->tCALH_min &&
+                   spec_timings->tCALS_min <= onfi_timings->tCALS_min &&
+                   spec_timings->tCAS_min <= onfi_timings->tCAS_min &&
+                   spec_timings->tCEH_min <= onfi_timings->tCEH_min &&
+                   spec_timings->tCH_min <= onfi_timings->tCH_min &&
+                   spec_timings->tCK_min <= onfi_timings->tCK_min &&
+                   spec_timings->tCS_min <= onfi_timings->tCS_min &&
+                   spec_timings->tDH_min <= onfi_timings->tDH_min &&
+                   spec_timings->tDQSCK_min <= onfi_timings->tDQSCK_min &&
+                   spec_timings->tDQSD_min <= onfi_timings->tDQSD_min &&
+                   spec_timings->tDS_min <= onfi_timings->tDS_min &&
+                   spec_timings->tDSC_min <= onfi_timings->tDSC_min &&
+                   spec_timings->tRHW_min <= onfi_timings->tRHW_min &&
+                   spec_timings->tRR_min <= onfi_timings->tRR_min &&
+                   spec_timings->tWHR_min <= onfi_timings->tWHR_min &&
+                   spec_timings->tWRCK_min <= onfi_timings->tWRCK_min &&
+                   spec_timings->tWW_min <= onfi_timings->tWW_min)
+                       return mode;
+       }
+
+       return 0;
+}
+
+/*
  * onfi_fill_sdr_interface_config - Initialize a SDR interface config from a
  *                                  given ONFI mode
  * @chip: The NAND chip