From: Wolfgang Muees <[email protected]>
o some cards are slower than the standard allows and need more
time to respond to a command. Max. observed number of bytes
was 12.
Signed-off-by: Wolfgang Muees <[email protected]>
---
This is one of a line of patches to enhance the usability of
the mmc spi host port driver from "don't work with most SD cards"
to "work with nearly all SD cards" (including those ugly cards
with non-byte-aligned responses).
diff -uprN 2_6_29_rc7_patch1_spi_mode_3/drivers/mmc/host/mmc_spi.c 2_6_29_rc7_patch2_wait_16bytes_response/drivers/mmc/host/mmc_spi.c
--- 2_6_29_rc7_patch1_spi_mode_3/drivers/mmc/host/mmc_spi.c 2009-03-11 12:58:47.000000000 +0100
+++ 2_6_29_rc7_patch2_wait_16bytes_response/drivers/mmc/host/mmc_spi.c 2009-03-11 13:00:06.000000000 +0100
@@ -279,8 +279,11 @@ static int mmc_spi_response_get(struct m
* so it can always DMA directly into the target buffer.
* It'd probably be better to memcpy() the first chunk and
* avoid extra i/o calls...
+ *
+ * Note we check for more than 8 bytes, because in practice,
+ * some SD cards are slow...
*/
- for (i = 2; i < 9; i++) {
+ for (i = 2; i < 16; i++) {
value = mmc_spi_readbytes(host, 1);
if (value < 0)
goto done;
---
regards
i. A. Wolfgang M?es
--
Auerswald GmbH & Co. KG
Hardware Development
Telefon: +49 (0)5306 9219 0
Telefax: +49 (0)5306 9219 94
E-Mail: [email protected]
Web: http://www.auerswald.de
?
--------------------------------------------------------------
Auerswald GmbH & Co. KG, Vor den Grash?fen 1, 38162 Cremlingen
Registriert beim AG Braunschweig HRA 13289
p.h.G Auerswald Gesch?ftsf?hrungsges. mbH
Registriert beim AG Braunschweig HRB 7463
Gesch?ftsf?hrer: Dipl-Ing. Gerhard Auerswald
On Wednesday 11 March 2009, Wolfgang M?es wrote:
> From: Wolfgang Muees <[email protected]>
>
> o some cards are slower than the standard allows and need more
> time to respond to a command. Max. observed number of bytes
> was 12.
>
> Signed-off-by: Wolfgang Muees <[email protected]>
Acked-by: David Brownell <[email protected]>
>
> ---
> This is one of a line of patches to enhance the usability of
> the mmc spi host port driver from "don't work with most SD cards"
> to "work with nearly all SD cards" (including those ugly cards
> with non-byte-aligned responses).
>
> diff -uprN 2_6_29_rc7_patch1_spi_mode_3/drivers/mmc/host/mmc_spi.c 2_6_29_rc7_patch2_wait_16bytes_response/drivers/mmc/host/mmc_spi.c
> --- 2_6_29_rc7_patch1_spi_mode_3/drivers/mmc/host/mmc_spi.c 2009-03-11 12:58:47.000000000 +0100
> +++ 2_6_29_rc7_patch2_wait_16bytes_response/drivers/mmc/host/mmc_spi.c 2009-03-11 13:00:06.000000000 +0100
> @@ -279,8 +279,11 @@ static int mmc_spi_response_get(struct m
> * so it can always DMA directly into the target buffer.
> * It'd probably be better to memcpy() the first chunk and
> * avoid extra i/o calls...
> + *
> + * Note we check for more than 8 bytes, because in practice,
> + * some SD cards are slow...
> */
> - for (i = 2; i < 9; i++) {
> + for (i = 2; i < 16; i++) {
> value = mmc_spi_readbytes(host, 1);
> if (value < 0)
> goto done;
>
> ---
> regards
>
> i. A. Wolfgang M?es
> --
> Auerswald GmbH & Co. KG
> Hardware Development
> Telefon: +49 (0)5306 9219 0
> Telefax: +49 (0)5306 9219 94
> E-Mail: [email protected]
> Web: http://www.auerswald.de
> ?
> --------------------------------------------------------------
> Auerswald GmbH & Co. KG, Vor den Grash?fen 1, 38162 Cremlingen
> Registriert beim AG Braunschweig HRA 13289
> p.h.G Auerswald Gesch?ftsf?hrungsges. mbH
> Registriert beim AG Braunschweig HRB 7463
> Gesch?ftsf?hrer: Dipl-Ing. Gerhard Auerswald
>
>