[PATCH 2/2] mci: sdhci: drop unused re-tuning timer plumbing

[Sascha Hauer]

From: Sascha Hauer <sascha at saschahauer.de>

tuning_count and tuning_mode are populated from the host's
CAPABILITIES_1 register at probe time but never consumed. In Linux
they feed an automatic re-tuning timer that periodically re-runs
tuning every N seconds after the controller's re-tuning timer (mode 1)
expires. barebox is a bootloader - tuning runs once at probe and the
controller is then handed to the OS - so the timer infrastructure
doesn't exist and the fields are dead weight.

Drop:
  - tuning_count / tuning_mode struct members
  - SDHCI_TUNING_MODE_1/2/3 defines
  - SDHCI_RETUNING_TIMER_COUNT_MASK / SDHCI_RETUNING_MODE_MASK
  - the dead read into a local tuning_count in sdhci_execute_tuning()
  - the populate block in sdhci_setup_host()

No behavioural change.

Assisted-By: Claude Opus 4.7
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 drivers/mci/sdhci.c | 18 ------------------
 drivers/mci/sdhci.h |  7 -------
 2 files changed, 25 deletions(-)

diff --git a/drivers/mci/sdhci.c b/drivers/mci/sdhci.c
index 1b13df8583..861e5c7862 100644
--- a/drivers/mci/sdhci.c
+++ b/drivers/mci/sdhci.c
@@ -311,10 +311,6 @@ int sdhci_execute_tuning(struct sdhci *sdhci, u32 opcode)
 {
 	struct mci_host *host = sdhci->mci;
 	int err = 0;
-	unsigned int tuning_count = 0;
-
-	if (sdhci->tuning_mode == SDHCI_TUNING_MODE_1)
-		tuning_count = sdhci->tuning_count;
 
 	/*
 	 * The Host Controller needs tuning in case of SDR104 and DDR50
@@ -1197,19 +1193,5 @@ int sdhci_setup_host(struct sdhci *host)
 	host->tuning_delay = -1;
 	host->tuning_loop_count = MAX_TUNING_LOOP;
 
-	/* Initial value for re-tuning timer count */
-	host->tuning_count = FIELD_GET(SDHCI_RETUNING_TIMER_COUNT_MASK,
-				       host->caps1);
-
-	/*
-	 * In case Re-tuning Timer is not disabled, the actual value of
-	 * re-tuning timer will be 2 ^ (n - 1).
-	 */
-	if (host->tuning_count)
-		host->tuning_count = 1 << (host->tuning_count - 1);
-
-	/* Re-tuning mode supported by the Host Controller */
-	host->tuning_mode = FIELD_GET(SDHCI_RETUNING_MODE_MASK, host->caps1);
-
 	return 0;
 }
diff --git a/drivers/mci/sdhci.h b/drivers/mci/sdhci.h
index 4a326f9d84..3c678d7999 100644
--- a/drivers/mci/sdhci.h
+++ b/drivers/mci/sdhci.h
@@ -175,9 +175,7 @@
 #define  SDHCI_DRIVER_TYPE_A			0x00000010
 #define  SDHCI_DRIVER_TYPE_C			0x00000020
 #define  SDHCI_DRIVER_TYPE_D			0x00000040
-#define  SDHCI_RETUNING_TIMER_COUNT_MASK	GENMASK(11, 8)
 #define  SDHCI_USE_SDR50_TUNING			0x00002000
-#define  SDHCI_RETUNING_MODE_MASK		GENMASK(15, 14)
 #define  SDHCI_CLOCK_MUL_MASK			GENMASK(23, 16)
 #define  SDHCI_CAN_DO_ADMA3			0x08000000
 #define  SDHCI_SUPPORT_HS400			0x80000000 /* Non-standard */
@@ -278,11 +276,6 @@ struct sdhci {
 	bool read_caps;	/* Capability flags have been read */
 	u32 sdma_boundary;
 
-	unsigned int		tuning_count;	/* Timer count for re-tuning */
-	unsigned int		tuning_mode;	/* Re-tuning mode supported by host */
-#define SDHCI_TUNING_MODE_1	0
-#define SDHCI_TUNING_MODE_2	1
-#define SDHCI_TUNING_MODE_3	2
 	/* Delay (ms) between tuning commands */
 	int			tuning_delay;
 	int			tuning_loop_count;
-- 
2.47.3