ipq40xx: 5.15: add patch commenting unused sdhci function

Add patch commenting unused sdhci function, hopin this will be dropped
when the problem is actually found.
Fix compilation warning:
drivers/mmc/host/sdhci-msm.c:1781:13: error: 'sdhci_msm_set_clock' defined but not used [-Werror=unused-function]
 1781 | static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
      |             ^~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Signed-off-by: Christian Marangi <[email protected]>

target/linux/ipq40xx/patches-5.15/401-mmc-sdhci-msm-comment-unused-sdhci_msm_set_clock.patch

@@ -0,0 +1,108 @@
+From 28edd829133766eb3cefaf2e49d3ee701968061b Mon Sep 17 00:00:00 2001
+From: Christian Marangi <[email protected]>
+Date: Tue, 9 May 2023 01:57:17 +0200
+Subject: [PATCH] mmc: sdhci-msm: comment unused sdhci_msm_set_clock
+
+comment unused sdhci_msm_set_clock and __sdhci_msm_set_clock as due to some
+current problem, we are forced to use sdhci_set_clock.
+
+Signed-off-by: Christian Marangi <[email protected]>
+---
+ drivers/mmc/host/sdhci-msm.c | 86 ++++++++++++++++++------------------
+ 1 file changed, 43 insertions(+), 43 deletions(-)
+
+--- a/drivers/mmc/host/sdhci-msm.c
++++ b/drivers/mmc/host/sdhci-msm.c
+@@ -1751,49 +1751,49 @@ static unsigned int sdhci_msm_get_min_cl
+ 	return SDHCI_MSM_MIN_CLOCK;
+ }
+ 
+-/*
+- * __sdhci_msm_set_clock - sdhci_msm clock control.
+- *
+- * Description:
+- * MSM controller does not use internal divider and
+- * instead directly control the GCC clock as per
+- * HW recommendation.
+- **/
+-static void __sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
+-{
+-	u16 clk;
+-
+-	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
+-
+-	if (clock == 0)
+-		return;
+-
+-	/*
+-	 * MSM controller do not use clock divider.
+-	 * Thus read SDHCI_CLOCK_CONTROL and only enable
+-	 * clock with no divider value programmed.
+-	 */
+-	clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+-	sdhci_enable_clk(host, clk);
+-}
+-
+-/* sdhci_msm_set_clock - Called with (host->lock) spinlock held. */
+-static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
+-{
+-	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+-	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+-
+-	if (!clock) {
+-		host->mmc->actual_clock = msm_host->clk_rate = 0;
+-		goto out;
+-	}
+-
+-	sdhci_msm_hc_select_mode(host);
+-
+-	msm_set_clock_rate_for_bus_mode(host, clock);
+-out:
+-	__sdhci_msm_set_clock(host, clock);
+-}
++// /*
++//  * __sdhci_msm_set_clock - sdhci_msm clock control.
++//  *
++//  * Description:
++//  * MSM controller does not use internal divider and
++//  * instead directly control the GCC clock as per
++//  * HW recommendation.
++//  **/
++// static void __sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
++// {
++// 	u16 clk;
++
++// 	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
++
++// 	if (clock == 0)
++// 		return;
++
++// 	/*
++// 	 * MSM controller do not use clock divider.
++// 	 * Thus read SDHCI_CLOCK_CONTROL and only enable
++// 	 * clock with no divider value programmed.
++// 	 */
++// 	clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
++// 	sdhci_enable_clk(host, clk);
++// }
++
++// /* sdhci_msm_set_clock - Called with (host->lock) spinlock held. */
++// static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
++// {
++// 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
++// 	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
++
++// 	if (!clock) {
++// 		host->mmc->actual_clock = msm_host->clk_rate = 0;
++// 		goto out;
++// 	}
++
++// 	sdhci_msm_hc_select_mode(host);
++
++// 	msm_set_clock_rate_for_bus_mode(host, clock);
++// out:
++// 	__sdhci_msm_set_clock(host, clock);
++// }
+ 
+ /*****************************************************************************\
+  *                                                                           *