Hello Ulf,
Please see my comment below.
On 2024-04-25 15:30, Ulf Hansson wrote:
Similar to what has already been changed for eMMC and the
MMC_SEND_OP_COND
(CMD1), let's convert the SD_APP_OP_COND (ACMD41) for SD cards to use
the
common __mmc_poll_for_busy() too.
This change means the initial delay period, that starts as 10ms will
now
increase for every loop when being busy. The total accepted timeout for
being busy is 1s, which is according to the SD spec.
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
---
drivers/mmc/core/sd_ops.c | 77 +++++++++++++++++++++++++--------------
1 file changed, 50 insertions(+), 27 deletions(-)
diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c
index a59cd592f06e..3ce1ff336826 100644
--- a/drivers/mmc/core/sd_ops.c
+++ b/drivers/mmc/core/sd_ops.c
@@ -19,6 +19,15 @@
#include "sd_ops.h"
#include "mmc_ops.h"
+#define SD_APP_OP_COND_PERIOD_US (10 * 1000) /* 10ms */
+#define SD_APP_OP_COND_TIMEOUT_MS 1000 /* 1s */
+
+struct sd_app_op_cond_busy_data {
+ struct mmc_host *host;
+ u32 ocr;
+ struct mmc_command *cmd;
+};
+
int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
{
int err;
@@ -115,10 +124,44 @@ int mmc_app_set_bus_width(struct mmc_card *card,
int width)
return mmc_wait_for_app_cmd(card->host, card, &cmd);
}
+static int sd_app_op_cond_cb(void *cb_data, bool *busy)
+{
+ struct sd_app_op_cond_busy_data *data = cb_data;
+ struct mmc_host *host = data->host;
+ struct mmc_command *cmd = data->cmd;
+ u32 ocr = data->ocr;
+ int err;
Minor nitpick... An empty line should be added here, to
separate the variable definitions from the subsequent code.
Otherwise, the patch is looking to me, so please include my
Reviewed-by: Dragan Simic <dsimic@xxxxxxxxxxx>
+ *busy = false;
+
+ err = mmc_wait_for_app_cmd(host, NULL, cmd);
+ if (err)
+ return err;
+
+ /* If we're just probing, do a single pass. */
+ if (ocr == 0)
+ return 0;
+
+ /* Wait until reset completes. */
+ if (mmc_host_is_spi(host)) {
+ if (!(cmd->resp[0] & R1_SPI_IDLE))
+ return 0;
+ } else if (cmd->resp[0] & MMC_CARD_BUSY) {
+ return 0;
+ }
+
+ *busy = true;
+ return 0;
+}
+
int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
{
struct mmc_command cmd = {};
- int i, err = 0;
+ struct sd_app_op_cond_busy_data cb_data = {
+ .host = host,
+ .ocr = ocr,
+ .cmd = &cmd
+ };
+ int err;
cmd.opcode = SD_APP_OP_COND;
if (mmc_host_is_spi(host))
@@ -127,36 +170,16 @@ int mmc_send_app_op_cond(struct mmc_host *host,
u32 ocr, u32 *rocr)
cmd.arg = ocr;
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
- for (i = 100; i; i--) {
- err = mmc_wait_for_app_cmd(host, NULL, &cmd);
- if (err)
- break;
-
- /* if we're just probing, do a single pass */
- if (ocr == 0)
- break;
-
- /* otherwise wait until reset completes */
- if (mmc_host_is_spi(host)) {
- if (!(cmd.resp[0] & R1_SPI_IDLE))
- break;
- } else {
- if (cmd.resp[0] & MMC_CARD_BUSY)
- break;
- }
-
- err = -ETIMEDOUT;
-
- mmc_delay(10);
- }
-
- if (!i)
- pr_err("%s: card never left busy state\n", mmc_hostname(host));
+ err = __mmc_poll_for_busy(host, SD_APP_OP_COND_PERIOD_US,
+ SD_APP_OP_COND_TIMEOUT_MS, &sd_app_op_cond_cb,
+ &cb_data);
+ if (err)
+ return err;
if (rocr && !mmc_host_is_spi(host))
*rocr = cmd.resp[0];
- return err;
+ return 0;
}
static int __mmc_send_if_cond(struct mmc_host *host, u32 ocr, u8
pcie_bits,
