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Diffstat (limited to 'drivers/ide/tx4938ide.c')
-rw-r--r--drivers/ide/tx4938ide.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/ide/tx4938ide.c b/drivers/ide/tx4938ide.c
index fa660f931a11..9c518e722707 100644
--- a/drivers/ide/tx4938ide.c
+++ b/drivers/ide/tx4938ide.c
@@ -39,10 +39,17 @@ static void tx4938ide_tune_ebusc(unsigned int ebus_ch,
39 /* Address-valid to DIOR/DIOW setup */ 39 /* Address-valid to DIOR/DIOW setup */
40 shwt = DIV_ROUND_UP(t->setup, cycle); 40 shwt = DIV_ROUND_UP(t->setup, cycle);
41 41
42 /* -DIOx recovery time (SHWT * 4) and cycle time requirement */
43 while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle)
44 shwt++;
45 if (shwt > 7) {
46 pr_warning("tx4938ide: SHWT violation (%d)\n", shwt);
47 shwt = 7;
48 }
42 pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n", 49 pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
43 ebus_ch, cycle, wt, shwt); 50 ebus_ch, cycle, wt, shwt);
44 51
45 __raw_writeq((cr & ~(0x3f007ull)) | (wt << 12) | shwt, 52 __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt,
46 &tx4938_ebuscptr->cr[ebus_ch]); 53 &tx4938_ebuscptr->cr[ebus_ch]);
47} 54}
48 55