Philip Langdale wrote:
> Hi all,
>
>
>
*snip*
> Signed-off-by: Philipl Langdale <[email protected]>
>
When you have a commit message larger than the patch, you know there is
something wrong. ;)
Please skip the part about MMC at least.
> @@ -588,12 +591,15 @@
>
> if (mmc_card_sd(card)) {
> csd_struct = UNSTUFF_BITS(resp, 126, 2);
> - if (csd_struct != 0) {
> + if (csd_struct != 0 && csd_struct != 1) {
> printk("%s: unrecognised CSD structure version %d\n",
> mmc_hostname(card->host), csd_struct);
> mmc_card_set_bad(card);
> return;
> }
> + if (csd_struct == 1) {
> + mmc_card_set_blockaddr(card);
> + }
>
> m = UNSTUFF_BITS(resp, 115, 4);
> e = UNSTUFF_BITS(resp, 112, 3);
>
Actually, the way the spec describes version 2.0 of the CSD leaves my
stomach a bit upset. I think we will find cards that put bogus values in
the fields, expecting most hosts to use the well defined values. So I'd
prefer a switch statement here, where csd_struct == 1 results in hard
coded values for many fields.
> @@ -824,6 +835,25 @@
> {
> struct mmc_command cmd;
> int i, err = 0;
> + static const u8 test_pattern = 0xAA;
> +
> + /*
> + * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
> + * before SD_APP_OP_COND. This command will harmlessly fail for
> + * SD 1.0 and MMC cards (fortunately including MMC 4 cards).
> + */
> + cmd.opcode = SD_SEND_IF_COND;
> + cmd.arg = ((host->ocr_avail & 0xFF8000) != 0) << 8 | test_pattern;
> + cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
> +
> + err = mmc_wait_for_cmd(host, &cmd, 0);
> + if (err == MMC_ERR_NONE) {
> + if ((cmd.resp[0] & 0xFF) != test_pattern) {
> + return MMC_ERR_FAILED;
> + } else if (ocr != 0) {
> + ocr |= 1 << 30;
> + }
> + }
>
> cmd.opcode = SD_APP_OP_COND;
> cmd.arg = ocr;
>
Put this in mmc_setup() with the rest of the initialisation. Hiding in
here just confuses things.
Also, please add a comment about why you manipulate the ocr.
> @@ -43,6 +43,7 @@
> #define MMC_RSP_R2 (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
> #define MMC_RSP_R3 (MMC_RSP_PRESENT)
> #define MMC_RSP_R6 (MMC_RSP_PRESENT|MMC_RSP_CRC)
> +#define MMC_RSP_R7 (MMC_RSP_PRESENT|MMC_RSP_CRC)
>
> #define mmc_resp_type(cmd) ((cmd)->flags & (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC|MMC_RSP_BUSY|MMC_RSP_OPCODE))
>
>
Wrong. R7 is defined as MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE.
(So is R6 btw, wonder why that is...)
Rgds
--
-- Pierre Ossman
Linux kernel, MMC maintainer http://www.kernel.org
PulseAudio, core developer http://pulseaudio.org
rdesktop, core developer http://www.rdesktop.org
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