Thread (55 messages) 55 messages, 5 authors, 2023-03-26

Re: [PATCH 11/32] parport_pc: add 16-bit and 8-bit fast EPP transfer flags

From: Sergey Shtylyov <hidden>
Date: 2023-03-11 20:09:58
Also in: linux-ide, lkml

On 3/8/23 1:46 AM, Ondrej Zary wrote:
quoted hunk ↗ jump to hunk
PARPORT_EPP_FAST flag currently uses 32-bit I/O port access for data
read/write (insl/outsl).
Add PARPORT_EPP_FAST_16 and PARPORT_EPP_FAST_8 that use insw/outsw
and insb/outsb (and PARPORT_EPP_FAST_32 as alias for PARPORT_EPP_FAST).

Signed-off-by: Ondrej Zary <redacted>
---
 drivers/parport/parport_pc.c | 20 ++++++++++++++++----
 include/uapi/linux/parport.h |  3 +++
 2 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index 5784dc20fb38..eda4e4e6d4e8 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c
@@ -298,9 +298,15 @@ static size_t parport_pc_epp_read_data(struct parport *port, void *buf,
 		}
 		return got;
 	}
-	if ((flags & PARPORT_EPP_FAST) && (length > 1)) {
-		if (!(((long)buf | length) & 0x03))
+	if ((length > 1) && ((flags & PARPORT_EPP_FAST_32)
+			   || flags & PARPORT_EPP_FAST_16
+			   || flags & PARPORT_EPP_FAST_8)) {
   Why not:
quoted hunk ↗ jump to hunk
+		if ((flags & PARPORT_EPP_FAST_32)
+		    && !(((long)buf | length) & 0x03))
 			insl(EPPDATA(port), buf, (length >> 2));
+		else if ((flags & PARPORT_EPP_FAST_16)
+			 && !(((long)buf | length) & 0x01))
+			insw(EPPDATA(port), buf, length >> 1);
 		else
 			insb(EPPDATA(port), buf, length);
 		if (inb(STATUS(port)) & 0x01) {
@@ -327,9 +333,15 @@ static size_t parport_pc_epp_write_data(struct parport *port, const void *buf,
 {
 	size_t written = 0;
 
-	if ((flags & PARPORT_EPP_FAST) && (length > 1)) {
-		if (!(((long)buf | length) & 0x03))
+	if ((length > 1) && ((flags & PARPORT_EPP_FAST_32)
+			   || flags & PARPORT_EPP_FAST_16
   I think it's preferred that an operator is left at the end of a broken up line...
+			   || flags & PARPORT_EPP_FAST_8)) {
	if (length > 1 && (flags & (PARPORT_EPP_FAST_32 |
				    PARPORT_EPP_FAST_16 |
			   	    PARPORT_EPP_FAST_8)) {
+		if ((flags & PARPORT_EPP_FAST_32)
+		    && !(((long)buf | length) & 0x03))
  Again, leave && on the higher line...
 			outsl(EPPDATA(port), buf, (length >> 2));
+		else if ((flags & PARPORT_EPP_FAST_16)
+			 && !(((long)buf | length) & 0x01))
+			outsw(EPPDATA(port), buf, length >> 1);
 		else
 			outsb(EPPDATA(port), buf, length);
 		if (inb(STATUS(port)) & 0x01) {
[...]

MBR, Sergey
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